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fwrite() return value does not match with file size


fwrite() return value does not match with file size

By : Rami Almaqssoud
Date : November 15 2020, 06:54 AM
help you fix your problem fwrite doesn't write to a file. The function writes to a buffered file stream. The buffer is flushed to disk when you close the file with fclose or flush the buffer with fflush. Use the appropriate function to empty the buffer.
The buffer is used to get a good performance. If performance is not your concern and you need the direct write to disk you can use the setbuf or setvbuf function to disable the buffer. ( for comment by Barmar).
code :


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2GB limit on file size when using fwrite in C?

2GB limit on file size when using fwrite in C?


By : Vinod
Date : March 29 2020, 07:55 AM
I wish this help you On a 32 bits system (i.e. the OS is 32 bits), by default, fopen and co are limited to 32 bits size/offset/etc... You need to enable the large file support, or use the *64 bits option:
http://www.gnu.org/software/libc/manual/html_node/Opening-Streams.html#index-fopen64-931
How to get the size of a text file created with fwrite in php

How to get the size of a text file created with fwrite in php


By : Praveen Kumar
Date : March 29 2020, 07:55 AM
seems to work fine after you save your file you know the path of the file try to get normally the filesize
code :
$filename = 'directory_upload/somefile.txt';
$filesize = filesize($filename);
C fwrite and file size

C fwrite and file size


By : Predrag Jovanovic
Date : March 29 2020, 07:55 AM
it should still fix some issue You are writing binary data to a file and then opening it with a text editor. The result is UNDEFINED. When you see that word "UNDEFINED" in documentation, pay attention. It is your responsibility to not do things like that. A text editor is for opening text files, which means strings. The way to write an int into a text file is to do something like:
code :
char str[BIGNUMBER];
sprintf(str, "%d", d[0]);
fwrite...
C fwrite() -ing an struct does not match fwrite() -ing the structs items separately

C fwrite() -ing an struct does not match fwrite() -ing the structs items separately


By : Luis
Date : March 29 2020, 07:55 AM
To fix the issue you can do Compiler adds padding to struct in order to align data in memory for performance. Size of struct will not always be adding size of its all members.
Add #pragma pack (1) at beginning of your file, and see the result. #pragma pack (1) will instruct compiler padding as 1 byte.
Will fwrite() let you write something past the end of the file size?

Will fwrite() let you write something past the end of the file size?


By : Anel Poluektova
Date : March 29 2020, 07:55 AM
this will help It is possible to write over the end of a file.
However in a mode (append mode) fseek has no effect on fwrite.
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