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jemmylau 2003-04-10
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如何判断文件是否存在
方法一、
POFSTRUCT lpOpenBuf=new OFSTRUCT;
HFILE hFile=OpenFile(strFileName,lpOpenBuf,OF_EXIST);
if(hFile!=HFILE_ERROR)
{
// file exist.
}
方法二、
#include
CString m_Edit=“f:\\test.txt”;//从Edit得到的字符串
ifstream infile(m_Edit);
if(!infile)
{
AfxMessageBox("该文件不存在");
}
方法三、
char *lpszStr="C:\WINDOWS\system32\MSCAL.OCX";
PathFileExists(lpszStr);
方法四、
FILE *fp=NULL;
fp = fopen( "C:\WINDOWS\system32\MSCAL.OCX", "r" );
if( fp != NULL )
{
MessageBox(NULL, "这个文件已经存在！", "Tips", MB_OK );
return ;
}
方法五、
HANDLE hFind;
WIN32_FIND_DATA dataFind;
BOOL bMoreFiles = TRUE;
//Find the first file in the main directory
hFind = FindFirstFile(TEXT("C:\\WINDOWS\\system32\\MSCAL.OCX"),&dataFind);
if(hFind) //若存在，则hFind == TRUE
{
}
else
{
}
FindClose(hFind);
方法六、
CString strPath("C:\\a.txt");
HANDLE hFile = NULL;
hFile= CreateFile(
strPath,
GENERIC_ALL,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,//判定文件是否存在 FILE_ATTRIBUTE_NORMAL,
NULL);
DWORD dwErr = GetLastError();
if (dwErr == ERROR_FILE_NOT_FOUND)
{
AfxMessageBox("FILE_NOT_FOUND");
}
if (hFile)
CloseHandle(hFile);
方法七、
CFileFind find;
int result=find.FindFile("C:\\aaa.txt");
if(result==0)
{
AfxMessageBox("文件不存在");
}
else
{
AfxMessageBox("文件存在");
}
方法一、
POFSTRUCT lpOpenBuf=new OFSTRUCT;
HFILE hFile=OpenFile(strFileName,lpOpenBuf,OF_EXIST);
if(hFile!=HFILE_ERROR)
{
// file exist.
}
方法二、
#include
CString m_Edit=“f:\\test.txt”;//从Edit得到的字符串
ifstream infile(m_Edit);
if(!infile)
{
AfxMessageBox("该文件不存在");
}
方法三、
char *lpszStr="C:\WINDOWS\system32\MSCAL.OCX";
PathFileExists(lpszStr);
方法四、
FILE *fp=NULL;
fp = fopen( "C:\WINDOWS\system32\MSCAL.OCX", "r" );
if( fp != NULL )
{
MessageBox(NULL, "这个文件已经存在！", "Tips", MB_OK );
return ;
}
方法五、
HANDLE hFind;
WIN32_FIND_DATA dataFind;
BOOL bMoreFiles = TRUE;
//Find the first file in the main directory
hFind = FindFirstFile(TEXT("C:\\WINDOWS\\system32\\MSCAL.OCX"),&dataFind);
if(hFind) //若存在，则hFind == TRUE
{
}
else
{
}
FindClose(hFind);
方法六、
CString strPath("C:\\a.txt");
HANDLE hFile = NULL;
hFile= CreateFile(
strPath,
GENERIC_ALL,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,//判定文件是否存在 FILE_ATTRIBUTE_NORMAL,
NULL);
DWORD dwErr = GetLastError();
if (dwErr == ERROR_FILE_NOT_FOUND)
{
AfxMessageBox("FILE_NOT_FOUND");
}
if (hFile)
CloseHandle(hFile);
方法七、
CFileFind find;
int result=find.FindFile("C:\\aaa.txt");
if(result==0)
{
AfxMessageBox("文件不存在");
}
else
{
AfxMessageBox("文件存在");
}
nonocast 2003-04-10
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see this
两个办法：
1、
CFileFind f;
if(f.FindFile("c:\\temp"))
AfxMessageBox("存在");
//Directory exist.
else
AfxMessageBox("不存在");
//Not exist.
2、
if(_access("c:\\temp", 0) == 0){
AfxMessageBox("存在");
}
else{
AfxMessageBox("不存在");
}
by the way
检查目录并且创建
//一个小函数，不管原来有没有存在都可以，没考虑只读属性的盘
void CBookSet::CreateDirTree(LPCTSTR path)
{
CString sFullPath = path;
int iPos = sFullPath.Find(_T("\\\\")) + 1;
if(iPos != 0)
{ // support \\192.168.53.136\vssworkpath\test2\...
iPos = sFullPath.Find(_T('\\'), iPos + 1);
iPos = sFullPath.Find(_T('\\'), iPos + 1);
}
else
{ // support c:\test2\...
iPos = sFullPath.Find(_T('\\'), iPos + 1);
}
while( -1 != (iPos = sFullPath.Find(_T('\\'), iPos + 1)) )
{
::CreateDirectory(sFullPath.Left(iPos), NULL);
}
}
两个办法：
1、
CFileFind f;
if(f.FindFile("c:\\temp"))
AfxMessageBox("存在");
//Directory exist.
else
AfxMessageBox("不存在");
//Not exist.
2、
if(_access("c:\\temp", 0) == 0){
AfxMessageBox("存在");
}
else{
AfxMessageBox("不存在");
}
by the way
检查目录并且创建
//一个小函数，不管原来有没有存在都可以，没考虑只读属性的盘
void CBookSet::CreateDirTree(LPCTSTR path)
{
CString sFullPath = path;
int iPos = sFullPath.Find(_T("\\\\")) + 1;
if(iPos != 0)
{ // support \\192.168.53.136\vssworkpath\test2\...
iPos = sFullPath.Find(_T('\\'), iPos + 1);
iPos = sFullPath.Find(_T('\\'), iPos + 1);
}
else
{ // support c:\test2\...
iPos = sFullPath.Find(_T('\\'), iPos + 1);
}
while( -1 != (iPos = sFullPath.Find(_T('\\'), iPos + 1)) )
{
::CreateDirectory(sFullPath.Left(iPos), NULL);
}
}
lblyy76 2003-04-10
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http://expert.csdn.net/Expert/topic/1625/1625535.xml?temp=.7201502
clife 2003-04-10
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CFileFind
CaptainIII 2003-04-10
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/* ACCESS.C: This example uses _access to check the
* file named "ACCESS.C" to see if it exists and if
* writing is allowed.
*/
#include <io.h>
#include <stdio.h>
#include <stdlib.h>
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" );
}
}
* file named "ACCESS.C" to see if it exists and if
* writing is allowed.
*/
#include <io.h>
#include <stdio.h>
#include <stdlib.h>
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" );
}
}
