1.
WIN32_FIND_DATA m_data;
HANDLE hFile;

hFile=FindFirstFile(filename,&m_data)

if(hFile==INVALID_HANDLE_VALUE) //file not found

Make sure you close the handle if the file is found. 

FindClose(hFile);

2.
You can use SHGetFileInfo()
The prototype of the function is as follows:

DWORD_PTR SHGetFileInfo( 

LPCTSTR pszPath,

DWORD dwFileAttributes,

SHFILEINFO *psfi,

UINT cbFileInfo,

UINT uFlags

);

3.
PathFileExists 

4. 加一个标准c库函数

Example

/* ACCESS.C: This example uses _access to check the * file named "ACCESS.C" to see if it exists and if * writing is allowed. */#include  
    
     #include  
     
      #include  
      
       void main( void ){   /* Check for existence */   if( (_access( "ACCESS.C", 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" );   }}