VC实现在浏览目录对话框中选择目录

使用MFC中的CFileDialog类,我们可以很方便的在目录对话框中选择打开或保存文件,但是有时我们需要的是在其中选择一个文件夹,这在MFC中并没有提供.这里提供一个简单的类来实现这个要求,是我在别人的程序代码中找到的.这个类是CDirDlg.

CDirDlg类的头文件DIR.H

#if!defined _THIS_IS_MY_DIRECTORY_SELECT_CLASS_
#define _THIS_IS_MY_DIRECTORY_SELECT_CLASS_
class CDirDlg
{
public:
CDirDlg();
virtual ~CDirDlg();

CString GetDirectory(CWnd *pParent=NULL,LPCSTR lpszRoot="c://",LPCSTR lpszTitle="Please Pick a Directory"

;

static CString m_sRootDir;

};
int CALLBACK BrowseCallbackProc(HWND hwnd,UINT uMsg,LPARAM lp, LPARAM pData);

#endif

源文件DIR.CPP

#include "stdafx.h"
#include "dir.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////

CString CDirDlg::m_sRootDir;

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CDirDlg::CDirDlg()
{

}

CDirDlg::~CDirDlg()
{

}

CString CDirDlg::GetDirectory(CWnd *pParent,LPCSTR lpszRoot,LPCSTR lpszTitle)
{
CString str;
BROWSEINFO bi;
bi.hwndOwner=pParent->m_hWnd; //owner of created dialog box
bi.pidlRoot=0; //unused
bi.pszDisplayName=0; //buffer to receive name displayed by folder (not a valid path)
bi.lpszTitle=lpszTitle; //title is "Browse for Folder", this is an instruction
bi.lpfn = BrowseCallbackProc; //callback routine called when dialog has been initialized
bi.lParam=0; //passed to callback routine
bi.ulFlags=
BIF_RETURNONLYFSDIRS | //only allow user to select a directory
BIF_STATUSTEXT | //create status text field we will be writing to in callback
// BIF_BROWSEFORCOMPUTER| //only allow user to select a computer
// BIF_BROWSEFORPRINTER | //only allow user to select a printer
// BIF_BROWSEINCLUDEFILES| //displays files too which user can pick
// BIF_DONTGOBELOWDOMAIN| //when user is exploring the "Entire Network" they
// are not allowed into any domain
0;
m_sRootDir=lpszRoot;

LPITEMIDLIST lpItemId=::SHBrowseForFolder(&bi);
if (lpItemId)
{
LPTSTR szBuf=str.GetBuffer(MAX_PATH);
::SHGetPathFromIDList(lpItemId, szBuf);
::GlobalFree(lpItemId);
str.ReleaseBuffer();
}

return str;
}

int CALLBACK BrowseCallbackProc(HWND hwnd,UINT msg,LPARAM lp, LPARAM pData)
{
TCHAR buf[MAX_PATH];

switch(msg)
{
// when dialog is first initialized, change directory to one chosen above
case BFFM_INITIALIZED:
strcpy(buf,CDirDlg::m_sRootDir);
::SendMessage(hwnd,BFFM_SETSELECTION,TRUE,(LPARAM)buf);
break;

// if you picked BIF_STATUSTEXT above, you can fill status here
case BFFM_SELCHANGED:
if (::SHGetPathFromIDList((LPITEMIDLIST) lp ,buf))
SendMessage(hwnd,BFFM_SETSTATUSTEXT,0,(LPARAM)buf);
break;
}
return 0;
}

使用方法:在你的工程中添加这两个文件进去,然后会在类视图中出现在CDirDlg类,该类中只有一个方法GetDirectory(),可以像下面这样用:
CDirDlg dlg;
m_strPath=dlg.GetDirectory(this,"我的电脑"

;