| I/O manipulators | ||||
| Print functions(C++23) | ||||
| C-style I/O | ||||
| Buffers | ||||
(C++23) | ||||
(C++98/26*) | ||||
(C++20) | ||||
| Streams | ||||
| Abstractions | ||||
| File I/O | ||||
| String I/O | ||||
| Array I/O | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
(C++98/26*) | ||||
(C++98/26*) | ||||
(C++98/26*) | ||||
| Synchronized Output | ||||
(C++20) | ||||
| Types | ||||
| Error category interface | ||||
(C++11) | ||||
(C++11) |
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Defined in header <cstdio> | ||
int fclose(std::FILE* stream); | ||
Closes the given file stream and writes any unwritten data fromstream'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 bystd::setbuf orstd::setvbuf, if any, is also disassociated and deallocated if automatic allocation was used.
If any data are written to an output device, returning from | (since C++26) |
The behavior is undefined if the value of the pointerstream is used afterstd::fclose returns.
Contents |
| stream | - | the file stream to close |
0 on success,EOF otherwise.
#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 EOFwhile((c=std::fgetc(fp))!=EOF)// Standard C I/O file reading loopstd::putchar(c); if(std::ferror(fp))std::puts("I/O error when reading");elseif(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
| opens a file (function)[edit] | |
| open an existing stream with a different name (function)[edit] | |
| flushes the put area buffer and closes the associated file (public member function of std::basic_filebuf<CharT,Traits>)[edit] | |
C documentation forfclose | |
