VC中,怎样判断一个文件是否存在?

[zhangyiheng]

如果文件存在的话,怎样删除?
就是
if(fileName.Exist())
deletefile(fileName);

具体的函数是怎样的?

[踏实每一步]

CFile file;
if(file.Open("1.txt",CFile::modeRead))
MessageBox("Get file");
else
MessageBox("no file");

[striking]

CFileFind finder;
static const TCHAR szFileToFind[] = _T("C:\\WINDOWS\\SYSTEM.INI");

BOOL bResult = finder.FindFile(szFileToFind);

if (bResult)
{
ok;

finder.Close();

}
else not found.

[xuzheng318]

OpenFile函数可以满足
HFILE OpenFile(
LPCSTR lpFileName, // pointer to the filename
LPOFSTRUCT lpReOpenBuff, // pointer to the file information struct
UINT uStyle // specifies the action and attributes
);
当返回HFILE_ERROR，则说明文件不存在！

[xuzheng318]

RemoveDirectory(path)删除文件夹（注：此文件夹必须没有文件）
DeleteFile(tempFileName);删除文件

[BombZhang]

if(GetFileAttributes("filename")!=0xFFFFFFFF)
{
DeleteFile("filename");
}

[qiulg]

bool IsExistFile(LPCSTR pszFileName)
{
WIN32_FIND_DATA FindFileData;
HANDLE hFind;

hFind = FindFirstFile(pszFileName, &FindFileData);

if (hFind == INVALID_HANDLE_VALUE)
return false;
else
{
FindClose(hFind);
return true;
}
return false;
}

[qiulg]

void DeleteFolder(LPCSTR lpDir)
{
CFileFind ff;
CString path = lpDir;

if(path.Right(1) != "\\")
path += "\\";
path += "*.*";
BOOL res = ff.FindFile(path);

while(res)
{
res = ff.FindNextFile();
if (!ff.IsDots() && !ff.IsDirectory())
DeleteFile(ff.GetFilePath());
else if (ff.IsDots())
continue;
else if (ff.IsDirectory())
{
path = ff.GetFilePath();
//是目录时继续递归，删除该目录下的文件
DeleteFolder(path.GetBuffer(path.GetLength()));
//目录为空后删除目录
RemoveDirectory(path);
}
}
ff.Close();
//最终目录被清空了，于是删除该目录
res = RemoveDirectory(lpDir);
if(res)
return;
}

[duyhui]

同意BombZhang(Love our country != Love the party)

GetFileAttributes()判断文件存在比较简单的实现方法

[lynx090]

直接使用ＳＨＥＬＬ　ＡＰＩ　PathFileExists（）ＭＳＤＮ：
Determines whether a path to a file system object such as a file or directory is valid.

Syntax

BOOL PathFileExists( LPCTSTR pszPath
);
Parameters

pszPath
[in] Pointer to a null-terminated string of maximum length MAX_PATH that contains the full path of the object to verify.
Return Value

Returns TRUE if the file exists, or FALSE otherwise. Call GetLastError for extended error information.

Remarks

This function tests the validity of the path. It works only on the local file system or on a remote drive that has been mounted to a drive letter. It will return FALSE for remote file paths that begin with the Universal Naming Convention (UNC) names \\ server or \\ server\ share. It will also return FALSE if a mounted remote drive is out of service.

Example


Show Example

#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;
}

}

OUTPUT
==============
Search for the file path of : C:\TEST\file.txt
The file requested "C:\TEST\file.txt" is a valid file
The return from function is : 1

The file requested "C:\TEST\file.doc" is not a valid file
The return from function is : 0
Function Information

Minimum DLL Version shlwapi.dll version 4.71 or later
Custom Implementation No
Header shlwapi.h
Import library shlwapi.lib
Minimum operating systems Windows 2000, Windows NT 4.0 with Internet Explorer 4.0, Windows 98, Windows 95 with Internet Explorer 4.0


--------------------------------------------------------------------------------

© 2003 Microsoft Corporation. All rights reserved.

[妍妍]

PathFileExists

[顶顶通-FreeSWITCH二次开发接口]

OK，OPEN一下看返回值，快，准