char *mktemp( char *template );  用于：Create a unique filename. Windows中，函数叫下面两个名字，包含于 io.h 文件中 char *_mktemp( char *template ); wchar_t *_wmktemp( wchar_t *template ); Return Value Each of these functions returns a pointer to the modified template. The function returns NULL if template is badly formed or no more unique names can be created from the given template. template的格式：baseXXXXXX，base为任意字符，然后是六个X。（记住，是六个哦） Example/* MKTEMP.C: The program uses _mktemp to create * five unique filenames. It opens each filename * to ensure that the next name is unique. */ #include"stdio.h" #include "io.h" #include "string.h" char *template = "fnXXXXXX"; char *result; char names[5][9]; void main( void ) { int i; FILE *fp; for( i = 0; i < 5; i++ ) { strcpy( names[i], template ); /* Attempt to find a unique filename: */ result = _mktemp( names[i] ); if( result == NULL ) printf( "Problem creating the template" ); else { if( (fp = fopen( result, "w" )) != NULL ) printf( "Unique filename is %s\n", result ); else printf( "Cannot open %s\n", result ); fclose( fp ); } } } OutputUnique filename is fna00141 Unique filename is fnb00141 Unique filename is fnc00141 Unique filename is fnd00141 Unique filename is fne00141

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