判断一个文件是否存在c++代码

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于 2016-08-09 09:28:09 发布

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分类专栏： C/C++ 文章标签：路径文件

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本文介绍两种检查文件是否存在及是否允许写入的方法。方法一使用FindFirstFileA函数判断文件是否存在，并通过CreateDirectoryA创建目录。方法二利用_acces函数检查文件的存在及写权限。

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方法1：
bool IsFileExists(const char* lpszFileName)
{
WIN32_FIND_DATAA wfd;
bool bRet;
HANDLE hFind;
hFind = FindFirstFileA(lpszFileName, &wfd);
bRet = (hFind != INVALID_HANDLE_VALUE);
FindClose(hFind);
return bRet;
}

string sPath = "C:\\MRVideoServicesLogs";
if(!IsFileExists(sPath.c_str()))
{
CreateDirectoryA(sPath.c_str(),NULL);
}

方法2：
//The following example uses _access to check the file named crt_ACCESS.C to see whether it exists and whether writing is allowed.
// crt_access.c
// compile with: /W1
// This example uses _access to check the file named
// crt_ACCESS.C to see if it exists and if writing is allowed.

#include <io.h>
#include <stdio.h>
#include <stdlib.h>

int main( void )
{
// Check for existence.
if( (_access( "crt_ACCESS.C", 0 )) != -1 )
{
printf_s( "File crt_ACCESS.C exists.\n" );

// Check for write permission.
// Assume file is read-only.
if( (_access( "crt_ACCESS.C", 2 )) == -1 )
printf_s( "File crt_ACCESS.C does not have write permission.\n" );
}
}

Output

File crt_ACCESS.C exists.
File crt_ACCESS.C does not have write permission.