std::fclose
From cppreference.com
| Defined in header <cstdio>
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int fclose( std::FILE* stream );
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Closes the given file stream and writes any unwritten data from stream's buffer to the associated output device. Any unread buffered data are discarded.
Whether or not the operation succeeds, the stream is no longer associated with a file, and the buffer allocated by std::setbuf or std::setvbuf, if any, is also disassociated and deallocated if automatic allocation was used.
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If any data are written to an output device, returning from |
(since C++26) |
The behavior is undefined if the value of the pointer stream is used after std::fclose returns.
Parameters
| stream | - | the file stream to close |
Return value
0 on success, EOF otherwise.
Example
Run this code
#include <cstdio>
#include <cstdlib>
int main()
{
int is_ok = EXIT_FAILURE;
FILE* fp = std::fopen("/tmp/test.txt", "w+");
if (!fp)
{
std::perror("File opening failed");
return is_ok;
}
int c; // Note: int, not char, required to handle EOF
while ((c = std::fgetc(fp)) != EOF) // Standard C I/O file reading loop
std::putchar(c);
if (std::ferror(fp))
std::puts("I/O error when reading");
else if (std::feof(fp))
{
std::puts("End of file reached successfully");
is_ok = EXIT_SUCCESS;
}
std::fclose(fp);
return is_ok;
}
Output:
End of file reached successfully