Question

VC 怎样判断一个文件夹是否存在？

RT

Answer 1

PathFileExists()函数, 例子如下：

#include <windows.h>
#include <iostream.h>
#include "Shlwapi.h"

void main( void )
{
// Valid file path name (file is there).
char buffer_1[] = "C:\\TEST\\file.txt";
char *lpStr1;
lpStr1 = buffer_1;

// Invalid file path name (file is not there).
char buffer_2[] = "C:\\TEST\\file.doc";
char *lpStr2;
lpStr2 = buffer_2;

// Return value from "PathFileExists".
int retval;

// Search for the presence of a file with a true result.
retval = PathFileExists(lpStr1);
if(retval == 1)
{
cout << "Search for the file path of : " << lpStr1 << endl;
cout << "The file requested \"" << lpStr1 << "\" is a valid file" << endl;
cout << "The return from function is : " << retval << endl;
}

else{
cout << "\nThe file requested " << lpStr1 << " is not a valid file" << endl;
cout << "The return from function is : " << retval << endl;
}

// Search for the presence of a file with a false result.
retval = PathFileExists(lpStr2);
if(retval == 1)
{
cout << "\nThe file requested " << lpStr2 << "is a valid file" << endl;
cout << "Search for the file path of : " << lpStr2 << endl;
cout << "The return from function is : " << retval << endl;
}

else{
cout << "\nThe file requested \"" << lpStr2 << "\" is not a valid file" << endl;
cout << "The return from function is : " << retval << endl;
}
}

Answer 2

楼上说的不对，有API的。
DirExists(sPath);

Answer 3

FILE* fp=fopen("writeinf.txt","r");
if(fp==NULL)//就是不存在writeinf.txt了
{
......
}
else //存在文件writeinf.txt
fclose(fp);

Answer 4

CFileFind::FindFile
virtual BOOL FindFile( LPCTSTR pstrName = NULL, DWORD dwUnused = 0 );

Return Value

Nonzero if successful; otherwise 0. To get extended error information, call the Win32 functionGetLastError.