VC下判断文件是否存在之最简方法（网络整理）

方法1：
#include  <io.h>
#include  <stdio.h>
#include  <stdlib.h>

void main( void )
{
    /* Check for existence */
    if( (_access( "D://a.txt", 0 )) != -1 )
    {
        printf( "File ACCESS.C exists/n" );
        /* Check for write permission */
        if( (_access( "ACCESS.C", 2 )) != -1 )
            printf( "File ACCESS.C has write permission/n" );
    }
}

方法2：
if (INVALID_HANDLE_VALUE != CreateFile("D://a.txt", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL))
{
    AfxMessageBox("File ACCESS.C exists/n");
}

方法3：
#define _WIN32_WINNT 0x0400

#include <windows.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
    WIN32_FIND_DATA FindFileData;
    HANDLE hFind;

    printf ("Target file is %s./n", argv[1]);
    hFind = FindFirstFile(argv[1], &FindFileData);
    if (hFind == INVALID_HANDLE_VALUE)
    {
        printf ("Invalid File Handle. GetLastError reports %d/n", GetLastError ());
        return (0);
    }
    else
    {
        printf ("The first file found is %s/n", FindFileData.cFileName);
        FindClose(hFind);
        return (1);
    }
}

方法4：
if (GetFileAttributes("c://1.txt") == -1)
    MessageBox(0."Invalid File ","hehe",0)
else
    MessageBox(0."The first file found ","haha",0)

方法5：
if (INVALID_HANDLE_VALUE != CreateFile("D://a.txt", 0, 0, NULL, OPEN_EXISTING, 0, NULL))
{
    AfxMessageBox("File exists/n");
}

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