fread() and fwrite() return the number of items read orwritten. This number equals the number of bytes transferred only whensize is 1. If an error occurs, or the end of the file is reached, thereturn value is a short item count (or zero).fread() does not distinguish between end-of...
Return value fwrite returns the number of full items the function writes, which may be less than count if an error occurs. Also, if an error occurs, the file-position indicator can't be determined. If either stream or buffer is a null pointer, or if an odd number of bytes to be wri...
If an error occurs, the return value may be less than count. Example 1: How fwrite() function works #include <iostream> #include <cstdio> using namespace std; int main() { int retVal; FILE *fp; char buffer[] = "Writing to a file using fwrite."; fp = fopen("data.txt","w")...
Return Value Remarks See Also Writes a character string to a file opened with a low-level file function. 複製 FWRITE(nFileHandle, cExpression [, nCharactersWritten]) Parameters nFileHandle Specifies the file handle number for the file to which FWRITE( ) writes. cExpression Specifies th...
函数fwrite向stream指定 的流 输出nmemb个 数据单元, 每个 单元 有size个 字节, 数据 来源 由ptr指针 指出. 相应的 无锁函数(non-locking) 参见unlocked_stdio(3). 返回值 (RETURN VALUE) fread和fwrite返回 成功 读/写 的 单元数 (也就是说, 不是字节数). 如果 出现 错误 或 到达文件末尾, 函数 返回...
The file pointer associated with stream (if there is one) is incremented by the number of bytes actually written. If stream is opened in text mode, each carriage return is replaced with a carriage-return - linefeed pair. The replacement has no effect on the return value. ...
Return Value fwrite returns the number of full items actually written, which may be less than count if an error occurs. Also, if an error occurs, the file-position indicator cannot be determined. If either stream or buffer is a null pointer, the function invokes the invalid parameter handler...
Return Value Remarks Requirements 3개 더 표시 Writes data to a stream. size_t fwrite( const void *buffer, size_t size, size_t count, FILE *stream ); Parameters buffer Pointer to data to be written. size Item size in bytes. ...
The file pointer associated with stream (if there is one) is incremented by the number of bytes actually written. If stream is opened in text mode, each carriage return is replaced with a carriage-return - linefeed pair. The replacement has no effect on the return value. See Also fread...
Return Value fwrite returns the number of full items actually written, which may be less than count if an error occurs. Also, if an error occurs, the file-position indicator cannot be determined. If either stream or buffer is a null pointer, the function invokes the invalid parameter handler...