判断文件是否存在的方法

来源：互联网发布：飘谁翻译的最好知乎编辑：程序博客网时间：2024/05/17 02:38

1, _access( )

// crt_access.c// compile with: /W1// This example uses _access to check the file named// crt_ACCESS.C to see if it exists and if writing is allowed.#include <io.h>#include <stdio.h>#include <stdlib.h>int main( void ){ // Check for existence. if( (_access( "crt_ACCESS.C", 0 )) != -1 ) { printf_s( "File crt_ACCESS.C exists./n" ); // Check for write permission. // Assume file is read-only. if( (_access( "crt_ACCESS.C", 2 )) == -1 ) printf_s( "File crt_ACCESS.C does not have write permission./n" ); } else { printf_s("File crt_ACCESS.C not found!/n"); }}

2, CreateFile() API

if (INVALID_HANDLE_VALUE != CreateFile(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL))

// OPEN_EXISTING文件已存在

3, GetFileAttributes() Function:
if (GetFileAttributes(filename)   !=   -1)
// file exits
 
4, FindFirstFile() Function:
WIN32_FIND_DATA   FindFileData;   
HANDLE   hFind;   
hFind   =   FindFirstFile(file,   &FindFileData);   
if   (hFind   !=   INVALID_HANDLE_VALUE)     
// file exits