VC下判断文件是否存在

http://blog.sina.com.cn/s/blog_4bc5d8350100aes8.html

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

void main( void )
{

if( (_access( "D://a.txt", 0 )) != -1 )
{
printf( "File ACCESS.C exists/n" );

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");
}