C语言 tmpnam()用法及代码示例

tmpnam()函数是一个特殊函数，它在“stdio.h”头文件中声明。每次至少调用TMP_MAX名称时，它都会生成一个不同的临时文件名。在此，TMP_MAX表示tmpnam()函数可以产生的最大不同文件名数。如果它的调用次数超过了TMP_MAX次，则该行为取决于实现。此处，L_tmpnam定义了一个char数组保存tmpnam结果所需的大小。

用法:

char *tmpnam(char *str)
s: The character array to copy the file name.
It generates and returns a valid temporary 
filename which does not exist. 
If str is null then it simply returns the tmp file name.

// C program to generate random temporary file names. 
#include <stdio.h> 
int main(void) 
{ 
    // L_tmpnam declared in the stdio.h file. 
    // L_tmpnam define length of the generated file name. 
    char generate[L_tmpnam + 1]; // Add +1 for the null character. 
    tmpnam(generate); 
    puts(generate); 
    return 0; 
}

输出：

The file names are dependent on running machine, which can be anything.
Example:/tmp/fileRTOA0m
         \s260.
         \s3ok.
         \s5gg. etc