Fread return value. cpp development by creating an account on GitHub.
Fread return value. Copy link earlephilhower commented Jan 3, 2024.
Fread return value fread returns the number of full items the function read, which may be less than count if an error occurs, or if it encounters the end of the file before reaching count. It will be completed? The function will return an error? Knowing how the file was read by the fread through? But offset-parameter we pass to fseek (in this case jump_offset) can come from anywhere. fd-- File descriptor used for write . size_t fread ( void * ptr, size_t size, size_t count, FILE * stream ); Read block of data from stream. If you really want to forget about this return value, while keeping the compiler (and your conscience) happy, you can cast the return value to void: #include <stdio. The fread function is defined as follows:. As manual suggested: fread() and fwrite() return the number of items successfully read or written Return Value. Follow edited May 18, 2012 at 10:46. The control didn't enter the last else if statement which is now a comment. I'm learning how to read content from a file in C. fread() fails for some unknown reason. cebtenzzre. The return value of fread, had you not discarded it, would have told you that the read stopped short of the number of bytes you requested. Copy link earlephilhower commented Jan 3, 2024. earlephilhower opened this issue Jan 3, 2024 · 0 comments Comments. Check fread return value meanings, and consider situations where return value is not that of full read. Viewed 184 times 0 . c: In fu Hello, I found a bug of zziplib on the lastest commit b7747bc. I checked other questions on the site but I didn't really found my problem. c. Closed ileanadumitrescu95 opened this issue Feb 8, 2023 · 1 comment Closed Compiler warning: ignoring return value of 'fread' declared with attribute 'warn_unused_result' #39. The filesize + 1 trick LLM inference in C/C++. Since you hit EOF, the feof call breaks out of the loop after that first pass, having consumed the entire file in one gulp. h>, the Comfortable return value & exception handling of a threaded function is a frequent "Pythonic" need and should indeed already be offered by the threading module - possibly directly in the standard Thread class. I think that a likely answer After the cast : show_mem. answered Nov 13, 2016 at 16:36. Defined inside <stdio. Jul 5, 2016 · 文章浏览阅读246次。 这个问题很容易搞错，并导致很多问题，需要强调的是fread函数返回的并不是字节数。realRead = fread(buf,item,count,fp) （每次读item大小的数据块，分count次来读。） 而是返回的是成功有效的读取的item元素的个数，而成功 Nov 9, 2016 · 通过对FILE *fp在fread，fwrite，fscanf，fprintf，fgets和fputs这六个文件操作函数中位置的解析，我们深入了解了每个函数的功能及其在文件操作中的重要作用。这些函数为C语言程序提供了丰富的文件操作能力，使得程序能够灵活地读取和写入数据，实现复杂的数据处理逻辑。 Apr 15, 2014 · 两者是块读写的方式，第二个参数是单个块的大小，第三个参数是块的个数，返回值是实际读写的块的个数，而不是字节数。如果将第三个参数设为1，那么如果fread读到的字节数小于第二个参数，则fread返回值为0。这个问题很容易搞错，并导致很多问题，需要强调的是fread函数返回的并不是字节数。 LLM inference in C/C++. src/link/object. Secondly, you are opening your stream as a text stream. fread() fails after reading complete contents of text file. cpp development by creating an account on GitHub. Commented Feb 4, 2016 at 0:24. You are passing The fread() function reads, into the array pointed to by ptr, up to nitems members whose size is specified by size in bytes, from the stream pointed to by stream. It's in the function unzzip_cat_file (unzzipcat-zip. FREAD( ) returns data starting from the current file pointer position and continues until it fread returns a size_t value but you're not doing anything with the return (in essence treating it like a void function). */ // terminate fclose (pFile); free (buffer); return 0; } Is that normal? fread return the number '1000' but the cursor (with ftell()) shows 1007 and any help will be appreciated. I hadn't noticed that, however. src-- Pointer to the buffer from where the output will be read LLM inference in C/C++. Follow answered Mar 21, 2015 at 19:18. For a text stream, the ftell() function doesn't return an offset: "For a text stream, its file position indicator contains unspecified information, usable by the fseek function for returning the file position indicator for the stream to its position at the time of the ftell call; the difference The EOF macro is used with functions that read a single character from a file or standard input and return it as a return value (for example, getchar() or fgetc()). fread I've realized that my much bigger file is failing because it can't properly read the first integer in a binary file. I'm doing some experiment on SSDs to check weather they have data loss under power fault. QiAnXinCodeSafe opened this issue Nov 19, 2019 · 2 comments Assignees. C. – user3185968. What is going wrong with fread() in my code? Hot Network Questions How did the Dutch Republic get sufficient timber to build its navies? caber in different expressions A place somewhere in Europe What does LLM inference in C/C++. I am trying to efficiently read from the stdin by using setvbuf in `_IOFBF~ mode. The fread() kind of standard IO library functions are optimized for system calls, rather your application making system LLM inference in C/C++. No one assigned In your code. – Jim Balter. nByte s. If the input is empty, then such functions return EOF instead of a character to tell you that no characters can be read. Commenting for those who have a when I read from a file using fread (C language), the return value of fread sometimes would be 0. c // // This program opens a file that's named FREAD. fread return value 1 byte, even though file is getting read completely. So, in your first case: nByteRead = Why does fread sometimes return incorrect values? Follow 5 views (last 30 days) Show older comments. Output Here, input. In some use cases, failures don't matter/can't be meaningfully handled. 4k 3 3 gold badges 52 52 silver badges 76 76 bronze badges. OUT and read in characters by using fread_s. @Useless (The first code did not print the result of the 3rd read. The fread() function is defined in the <stdio. 1 The fread function 2) fread and fwrite return values does not match blktrace output. You should check the return value of read() to ensure it was successful otherwise you are assuming that rtc_data has been correctly populated and it may not have been. zstd/programs/fileio. The function scanf has been explicitly declared (via a gcc function attribute) to trigger this warning if you discard its return value. The computation of the value to be returned by fread() is different, but the expense of the calculation is trivial. The fread() function returns the number of full items successfully read, When using fread() for record input, you should set size to 1 and count to a large value. char buf[255]; // With signed char, `number_of_items` may equal -1 char number_of_items = sizeof buf; // Passing -1 to `fread()` is like passing `SIZE_MAX`. size The size of each element to read. Commented Aug 15, 2014 at 6:34 | Show 5 more comments. Stripping newlines from fread. After reading questions about 'tainted' values now I am not sure if I need to put check on return value of fseek or fread itself. We don't actually need explicit synchronization for the accesses to value due to memory consistency guarantees of CountDownLatch. sssd-bot opened this issue May 2, 2020 · 0 comments Assignees. Nov 5, 2008 · 用fopen、fwrite和fread三个函数可以搞定， 先打开file2，对她进行读fread，读一段然后打开file1，用fwrite写入file1 如此循环直到读完、写完为止 问题是如何知道fread读到了文件的末尾了那？ 正在焦急等待高手指导 Jan 26, 2022 · Describe the bug A build with GCC can produce warnings ignoring return value (-Wunused-result) coming from library functions declared with attribute warn_unused_result (such as fgets and fread). What do you mean with "I'm programming in C on PuTTy"? And how to get rid of the warning is simple: follow the implicit advice of the warning. 18 . To make the warning dissapear, one can write (void) foo(); My question is, what is the "proper" way to write code like this, should I continue as I always did, Incorrectly typed arguments. See syntax, examples, and a program that demonstrates how to read a structure variable from fread() Return value The fread() function returns the number of objects read successfully. size_t fread (void * ptr, size_t size, size_t count, FILE * stream); where the size argument specifies the size (in bytes) of each element to read, and count specifies the (maximum) number of such elements to read. Harry on 26 Mar 2019. fp The stream from which to read the elements. Hot Network Questions How to achieve same double to string conversion rounding results in C++ and C#? Untrained neural network models fread return the number of elements read, not number of bytes. 4. It then tries to open // FREAD. What exactly do you not Compiler warning: ignoring return value of 'fread' declared with attribute 'warn_unused_result' #39. hence the result of 1 and next was 4 (assuming input was You got the right value but used the wrong format string to print it, yielding undefined behavior. Closed earlephilhower opened this issue Jan 3, 2024 · 0 comments Closed Minor compiler warning on build, fread return value unused #91. c also When I tried to read the file with fread function it returns 0 and the variable is not filled completely. warning: ignoring return value of ‘fgets’, LLM inference in C/C++. Some times requested size of data not available in the file. Hello, I'm trying to package master of rgbds for nixos/the nix package manager, but I'm running into some issues: yacc: 2 shift/reduce conflicts, 3 reduce/reduce conflicts. The first 20-40 bytes of 256 bytes seems to be always correct. And let's say that I delibertly ignore the return value of the function. ThreadPool has way too much overhead for simple tasks - 3 managing threads, lots of bureaucracy. ileanadumitrescu95 opened this issue Feb 8, 2023 · 1 comment . Closed sssd-bot opened this issue May 2, 2020 · 0 comments Closed ignoring return value of ‘fread’ in sss_debuglevel #2468. The function returns the number of elements successfully read, which may be less than nmemb if a read error or end-of-file (EOF) occurs. The below table lists valid mode values for feof() function with their meaning: Opening Modes. Closed: Fixed Issue was closed as fixed. Vote. With poorly typed code, it can seem like a value greater than the number of items. 122k 20 20 gold badges 214 214 silver badges 258 258 bronze badges. 21. Issue testing fclose return value. – "If you had checked the return of fread" Incredibly useful. Contribute to ggerganov/llama. Ask Question Asked 7 years, 5 months ago. You can obtain nFileHandle from the return value of successful FOPEN( ) or FCREATE( ) statements. This example attempts to read NUM_ALPHA characters from the file myfile. When fread() reports a short read, the contents of the buffer after the data it reports reading are indeterminate. The value array creation happens-before uiThread start (program order rule) which synchronizes-with the assignment of 2 to value[0] (thread start) which happens-before latch. Return Value The total number of elements successfully read is returned. Mat. PuTTy is not an IDE. and don't compare with SIZE*NUMELEM,fread always returns number of items read successfully. The English word short, in this context, can only refer to the number of missing items. Follow edited Nov 13, 2016 at 17:01. countDown() (program order rule) which happens buffer - pointer to the first object in the array to be written size - size of each object count - the number of the objects to be written stream LLM inference in C/C++. You mentioned the read() function, which reads a sequence of characters into the buffer Cast the return value to void if you really want to ignore it (you probably don't). juhist juhist. You need to save the return value from fread() — it's a size_t — and use that to guide you. Compiling picotool under Ubuntu 20. 5. Copy link QiAnXinCodeSafe commented Nov 19, 2019. Hot Network Questions Are pigs effective intermediate hosts of new viruses, due size_t fread_buf( void* ptr, size_t size, FILE* stream) { return fread( ptr, 1, size, stream); } size_t fwrite_buf( void const* ptr, size_t size, FILE* stream) { return fwrite( ptr, 1, size, stream); } As for a rationale for the parameters to fread()/fwrite(), I've lost my copy of K&R long ago so I can only guess. num The number of elements to read. or just move the closing bracket from behind '0' directly behind fread(). Without an explicit allocation, p points to some memory address which is most likely not accessible from your program. h> size_t fread( void* buf, size_t size, size_t num, FILE* fp); Arguments: buf A pointer to a buffer where the function can store the elements that it reads. – Eli Sadoff Indeed. Array has size 40 bytes, element size: 8 Array at 0x1337f00d6960 read successfully, contents: 1. You are not checking any return values from those functions, which you should. Hot In one C application I'm maintaining, there are a number of calls to fread(). The fread() function reads data from a file and writes into a block of memory. I guess it can't be endianess problem too because I think I would get bad values Change the fread() call to: fread(&i, sizeof(int), 1, file); The second argument is the size of an element to read, the third argument is the number of elements to read. I was initializing an fopen, where ftell was returning a value larger than what there was there (in terms of size), which meant that it was reading null characters with a printf. That said, your usage of fwrite() and fread() are problematic. You should also check the return values from fopen() and fread() calls to ensure they were successful. The file position indicator for the stream (if defined) is advanced by the number of bytes successfully read. If size or nmemb is zero, fread returns The fread() function returns an integer value with a value smaller than count if there is no error or if EOF (which has the value -1 and indicates the end of input) is encountered. Return value. It reads a specified number of elements, each of a given size, from an input stream and stores them in an array. 3,992 4 4 gold Function fread() reads data from the given data stream(4th parameter) to an array pointed in to by a pointer(1st parameter) fread (pointer to the block of memory, size of an element, number of elements, pointer to the input file) fread() reads from where it left off last time and returns the number of elements successfully read. Example: Let's Return value. txt file, line by line, where each line is 19 characters long, this is my code (I want to only use fseek and fread to understand pointers rightly): int main(int argc, char *arg If the size or count is zero, a call to fread will return zero and no other action is performed. Returns NULL if failed. fread() --> Is a function provided in standard library. I am new to buffering. For example, say you have Another thing is that I already checked the return value of fread and it returns the right value (numData). Improve this question. int *p; *p = 5; invokes undefined behavior as you try to write to unitialized memory. This problem is specific for windows only. binfile should contain the binary representation of the integers: 10, 20, 30, 40, 50. %i is for signed integers. Jun 9, 2020 · fread()和readfile()fread()最大一次性能读取8k长度的字节数，所以不能一次性读取大文件去作下载。优势在于，操作更加灵活，每次读取指定字节的内容，用于下载时方便控制服务器的流量。readfile()优势是能够一次性读取大文件；不需要PHP预读到内存，下载速度更快，直接把文件的处理交由服务器。 Jul 21, 2016 · `fread`函数的返回值是实际读取并存储到内存中的元素数量。如果返回值等于`count`，则意味着成功读取了所有请求的数据。如果返回值小于`count`，可能是因为到达了文件末尾，或者发生了错误。在实际编程中，通常需要 May 13, 2010 · 如上图，fwrite的返回值writesize=709800,但是通过资源管理器查看我实际文件的值为708608，小于函数返回的已经写入的值。后来发现是fread()函数的问题 打开一个文件进行写操作，如果只open()打开一次，在没有close()的情况下连续多次fwrite(),但最后发现其实并没有写到文 LLM inference in C/C++. Also, the file position will now be at the end of the file, so you can't re-read that chunk. Share. Try assigning the result of fread to a variable of type size_t . You need %u. Perhaps this video, starting around 8:20 will explain/clarify what is going on. c:25:3: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result] (void)write(1, " bytes\n", 7); – pierreafranck. You can use stat() to get the number of bytes in the file regardless of content type. Add a comment | 7 If you want to determine how many bytes that fread successfully read out of the file, check its return value. Why does fread() in c read extra '#newlines' characters? 0. here the fscanf is supposed to check for matches in the input file with the format string provided in the function call and accordingly assign the (in order of their position) variable - address with the value and once completed it will return the total count for the number of successfull assignments it made. Relevant code in function This "getting the last partial block twice" makes me speculate the problem is tied to how program is detecting end-of-file. Assignees. Link. size: Size of each objects in bytes. fread removes a different previously assigned character string. c; file; fread; Share. According to the specification, the two may be treated differently by the The correct way to read your file is to pass correct parameters to fread and use the return value to determine the number of successfully read characters: the difference between two such return values is not necessarily a meaningful measure of the number of characters written or read. fread(data, 1, m_sizeOfData, fp); You can then use the return value of fread to determine how many bytes were read. Instead, 0 means an complete read did not occur due to : fread() return value in C. Also, Windos likes to have binary files opened as "wb"/"rb" to Introduction. h> header file. The `fread()` function in C is used for reading binary data from a file. Reviewers. fread works on linux but not on windows. ggerganov. Now you are assigning the value read from file to the memory address value the variable is pointing to. 1 way to get into trouble. File Opening Modes. Comments. I am looking for working examples. Library: libc Don't compare fread() return value with requested size. fread() function gives garbage. cebtenzzre approved these changes on 2023-11-14 ggerganov approved these changes on 2023-11-17 ggerganov merged c7cce124 into master 1 year ago. The posted code is reading a single byte into an int. The below programs illustrate the fread() function. Commented Feb 8, 2018 at 14:11. bug good first issue help wanted. e8a00146. An English-speaking person would assume that a "short item count" counts the amount of items that you are short. LLM inference in C/C++. 1. fread() weird behavior in C. How do I know whether my function returns a value in C. Why fread() is not getting the expected bytes? 1. C Library - fread() function - The C library size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream) function reads data from the given stream into the array Whoever taught you to use fseek()/ftell() to get the size of a file taught you wrong. Consider at first. Reading a file with fread does not end up as expected. Minor compiler warning on build, fread return value unused #91. 8. count: The number of objects to read. For more information read manual page of fread() Share. However after that the data gets corrupted. Amnon Amnon You are declaring begintag as an array, so you should not put an ampersand & front of it in the fread call. 31. nhave = fread(dst, 1, nwant, fp); From the C17 standard : The problem is, after reading some chunks, fread() starts giving the wrong values! Also, depending on the chunk size, the positions where fread() starts behaving strangely differs: chunk of 1 pos, wrong at chunk 22025475 chunk of 10000 pos, wrong at chunk 2203 chunk of 100000 pos, wrong at chunk 221 Anyone has any idea of what might be going on? Fix compilation warning that fread return value is not used. See more fread() will read a count of items of a specified size from the provided IO stream (FILE* stream). Reply reply More replies More replies. At the first step I write a random data on SSD and then in the next step I inject a power fault to it. Unfortunately Thread's layout was copied from Java In both codes, the last read was a partial read with a fread() return value of 0. Modified 7 years, 5 months ago. ssize_t esp_vfs_pwrite (int fd, const void * src, size_t size, off_t offset) Implements the VFS layer of POSIX pwrite() Parameters. The above is definitely a bug, but if it's not the source of the problem at hand, it's also possible that you're using a legacy compiler on Windows and the writing code is failing to open the file in binary mode. fread is returning 1 I already checked the return value with result i forgot to add a result to one of the freads but it is LLM inference in C/C++. Provide details and share your research! But avoid . Then a binary read into content will ensure you read the entire file. Maybe you should read the documentation. Other ones had problems like they set file indicator with fseek at the end of the file when they got all the zero's. Fix the actual problem by actually using the variable/return value (probably what you actually want). Add I am trying to read 128KB binary file in chunks of 256 Bytes. You should check fread's return value so you won't run into infinite loops in the case of errors. If you are getting the expected count returned, then you can be comfortable that you are reading all the data you wanted. The input begins with two integers (n,k). ) With fread(), a return value of 0 does not mean "end-of-file" was immediately encountered - nothing read. why is fread() failing during file read? 1. Find and fix vulnerabilities Jan 2, 2025 · A positive return value indicates the number of bytes read. c:37) , and it is caused by incorrect handling of the return value of the function ‘zzip_fread’. How come my fread returns an empty string? Hot Network Questions Is poverty in the present After RTFM, it is now somewhat unclear to me what I can really infer from the return value of fread()/fwrite() if the returned value is less than the number of requested elements. 000000 [] Reference // crt_fread_s. This is my test file I've set up to do only that. stream: The file stream to read the data from. Even then, you can still handle errno == EINTR by simply repeating the fread() return value in C. #include <stdio. c // Command line: cl /EHsc /nologo /W4 crt_fread_s. After using fread(), note its return value and use that to determine how much was read. The C fread() is a standard library function used to read the given amount of data from a file stream. r. I tried reading the file and Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. 04 and GCC 9. And I manage to scrape through the following code. fread() Parameters. What will happen when I get near the end of the file, and I can not read "size" * sizeof (Reg), or if you are only available to read half this amount, what will happen with my array A. Line 1777 in 6a7f651. C - is it necessary to check freopen return value? 1. The double brackets make no sense at all – Ingo Leonhardt. hmjd hmjd. My comment was in regards to explicitly comparing the return value to 4, rather than 0, because if fread were to return 3, 2 or 1 then there would be uninitialised bytes in buffer, which would result in undefined behaviour if those values were used. (but the return values will be different). It doesn't reread the bytes GHINOP; they are still in the buffer from the previous successful read. Hello, I have a driver code as follows: class my_driver; // code virtual task run(); forever begin // code $sformatf("<print something>", <variables>); end endtask Return Value: Returns a FILE pointer if the file is successfully opened. -1 is return on failure and errno is set accordingly. ignoring return value of ‘fread’ in sss_debuglevel #2468. The card. 4 However, this loop has an issue: if the last chunk of the file is less than 512 characters long, then you'll do the fread, the data will be loaded into bytes, but you'll lose the return value of fread. It is defined in <cstdio> header file. You need to allocate memory to p before you can dererefernce it. Follow answered Dec 3, 2009 at 23:38. Getting excess characters with fread() in C. Nov 19, 2019 · The return value of 'fread()' should be checked #1895. Use the size of input to determine how much to attempt to read at once. How to use fread correctly? 0. Complications with fread function. On short read, don't forget to check feof() and ferror() to determine why the failure occurred. Searches file. 4,314 18 18 silver badges 33 33 bronze badges. If size or count is zero, fread returns zero and performs Learn how to use fread() function to read binary data from a file in C programming. Labels. For text streams, the value is not For larger reads, it might make multiple lower-level calls. h> #include <stdlib. The following im trying to read a . If an error or end of file condition occurs, the return value may be less than count . Follow answered Jul 11, 2013 at 6:52. 000000 4. Example. The warning (rightly) indicates that it is a bad idea not to check the return value of scanf. Login to write a write a comment. Login via GitHub. Chinna Chinna. Description. Specifies the number of bytes returned by FREAD( ) with a limit of 65,535 bytes. with the posted syntax, fread will return 200 if it reads 200 bytes of data. Specifies the file handle number for the file from which FREAD( ) returns data. raw in the distro does not have any "partial blocks", it contains 10,255 512-byte blocks. See the attributes, standards, history, examples and references of these functions Return Value. For a text stream values returned by ftell do not generally have any meaningful numerical semantics. If the attempt succeeds, // the program displays the number of actual items read. . Calling fread() is mainly used for binary file data where struct data are stored. Jesper Juhl Jesper Juhl. Number of objects read successfully, which may be less than count if an error or end-of-file condition occurs. Setting the ReadBuffer[/*output of fread*/] = 0; was the trick for me. kennbr • • LLM inference in C/C++. 000000 3. It reports 6 bytes; accessing anything after that leads to Getting rid of the warning is easy: Don't ignore the return value of realloc(). If there are any errors with either fread() You are 1 short, you are not 3 short. fread() return value in C. Follow answered Feb 5, 2012 at 9:13. buffer: Pointer to the block of memory to store the objects. 1 If you want to determine the file size before reading a file, do this: size_t len; fseek(fp, 0, SEEK_END); len = ftell(fp); rewind(fp); I was wondering if it correct to check if the return value of fread(3) (which is the number of items read) is less than the number requested, rather than just 0, to detect EOF. 207k 41 41 or binary streams, the value returned corresponds to the number of bytes from the beginning of the file. fread returns 0 even though the data inside is found. 000000 2. If this number differs from the count parameter, ); exit (3);} /* the whole file is now loaded in the memory buffer. Freopen not writing output after a function call. The return value is the number of elements read successfully. h> void read_content(FILE *file) { char *x = Failing to check the return from fread() and compare against filesize is the No. It returns the number of items successfully read from the stream. It can be read from file or it can be computed some how. Host and manage packages Security. 0. If it returns a number less than fread (3) and fwrite (3) return the number of items read or written, or a short item count on error or end-of-file. fread the same file, but return different result. Instead of querying for the file size, I would simply call fread (or other input functions) in a loop until the end of file. Improve this answer. Coverity showed notifications starting from fread. fread weird behavior in c. OUT and // writes characters to the file. Asking for help, clarification, or responding to other answers. 000000 5. Sep 12, 2014 · 原文地址：与 fread 的区别的误解">read 与 fread 的区别的误解作者：刻卜浪兴 前多时间梳理了一些Linux上的编程，其实就是认识的大量的系统调用（POSIX）。这里有一个我们经常提出的问题就是fread，read的区别。（当然这两个分别代表了操作文件系统的两套不同的函数，包括open,read, write, seek 等）。 LLM inference in C/C++. All of your output was produced by the first and only call to fprintf. 2 (Quoted from: ISO:IEC 9899:201x 7. The next n lin After debugging and a little trial and error, I realized that fread() does not return any value less than 512 at all. 2. The return value is checked for the number of bytes read, and stops when it reaches 0, meaning the file/stream end has When you know the actual return value of fread(), perhaps the problem will be easier to track down then. Parameters nFileHandle. The main difference between these two is the number of system calls in your application. This is confusing because I supposed that fread() would return less than 512 in a block with slack space and the walkthrough video for recover. File reading in C. At the end I buffer - pointer to the first object in the array to be read size - size of each object in bytes count - the number of the objects to be read LLM inference in C/C++. You can read only one record at a time when using record I/O. I tried the same code with Linux (Ubuntu virtual machine) and it worked well. – Did you check the value of sizeIndexI? Maybe it is simply zero? If you ask fread to read zero elements, it expectedly returns zero. When trying to read in a signature from a bmp file, and after calling fread, sigcontains 52428Note this is 0xCCCC instead of 19778, which is the proper decimal value for 0x4D42 or 'BM' which is the proper header signature LLM inference in C/C++. uofhhmxtrbbwjcedpzskxpfanthmgsgtqpgpulsnsdfjywgxsbiu