程序来源：http://www.codeguru.com/Cpp/W-D/dislog/dialogforselectingfolders/article.php/c2019/
一个非常好用的选择目录的类
/////////////////////////////////////////////////////////////////
头文件：
//////////////////////////////////////////////////////////////////////////
//PathDialog.h file
//
//Written by Nguyen Tan Hung <tanhung@yahoo.com>
//////////////////////////////////////////////////////////////////////////
#if !defined(AFX_PATHDIALOG_H__0F70BC86_11DB_11D4_B012_0000E8DD8DAA__INCLUDED_)
#define AFX_PATHDIALOG_H__0F70BC86_11DB_11D4_B012_0000E8DD8DAA__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// PathDialog.h : header file
//
#include "shlobj.h"
class CPathDialog;
// CPathDialogSub - intercepts messages from child controls
class CPathDialogSub : public CWnd
{
friend CPathDialog;
public:
CPathDialog* m_pPathDialog;
protected:
afx_msg void OnOK(); // OK button clicked
afx_msg void OnChangeEditPath();
DECLARE_MESSAGE_MAP()
private:
};
/////////////////////////////////////////////////////////////////////////////
// CPathDialog dialog
class CPathDialog
{
friend CPathDialogSub;
// Construction
public:
CPathDialog(LPCTSTR lpszCaption=NULL,
LPCTSTR lpszTitle=NULL,
LPCTSTR lpszInitialPath=NULL,
CWnd* pParent = NULL);
CString GetPathName();
virtual int DoModal();
static Touch(LPCTSTR lpPath, BOOL bValidate=TRUE);
static int MakeSurePathExists(LPCTSTR lpPath);
static BOOL IsFileNameValid(LPCTSTR lpFileName);
static int ConcatPath(LPTSTR lpRoot, LPCTSTR lpMorePath);
private:
static int CALLBACK BrowseCallbackProc(HWND hwnd,UINT uMsg,LPARAM lParam, LPARAM pData);
LPCTSTR m_lpszCaption;
LPCTSTR m_lpszInitialPath;
TCHAR m_szPathName[MAX_PATH];
BROWSEINFO m_bi;
HWND m_hWnd;
CWnd* m_pParentWnd;
BOOL m_bParentDisabled;
BOOL m_bGetSuccess;
CPathDialogSub m_PathDialogSub;
};
//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
#endif // !defined(AFX_PATHDIALOG_H__0F70BC86_11DB_11D4_B012_0000E8DD8DAA__INCLUDED_)
/////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////
cpp文件：
//////////////////////////////////////////////////////////////////////////
//PathDialog.h file
//
//Written by Nguyen Tan Hung <tanhung@yahoo.com>
//////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "PathDialog.h"
#include <io.h>
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#define IDC_FOLDERTREE 0x3741
#define IDC_TITLE 0x3742
#define IDC_STATUSTEXT 0x3743
#define IDC_NEW_EDIT_PATH 0x3744
// Class CDlgWnd
BEGIN_MESSAGE_MAP(CPathDialogSub, CWnd)
ON_BN_CLICKED(IDOK, OnOK)
ON_EN_CHANGE(IDC_NEW_EDIT_PATH, OnChangeEditPath)
END_MESSAGE_MAP()
void CPathDialogSub::OnOK()
{
::GetWindowText(::GetDlgItem(m_hWnd, IDC_NEW_EDIT_PATH),
m_pPathDialog->m_szPathName, MAX_PATH);
if(CPathDialog::MakeSurePathExists(m_pPathDialog->m_szPathName)==0)
{
m_pPathDialog->m_bGetSuccess=TRUE;
::EndDialog(m_pPathDialog->m_hWnd, IDOK);
}
else
{
::SetFocus(::GetDlgItem(m_hWnd, IDC_NEW_EDIT_PATH));
}
}
void CPathDialogSub::OnChangeEditPath()
{
::GetWindowText(::GetDlgItem(m_hWnd, IDC_NEW_EDIT_PATH),
m_pPathDialog->m_szPathName, MAX_PATH);
BOOL bEnableOKButton = (_tcslen(m_pPathDialog->m_szPathName)>0);
SendMessage(BFFM_ENABLEOK, 0, bEnableOKButton);
}
/////////////////////////////////////////////////////////////////////////////
// CPathDialog dialog
CPathDialog::CPathDialog(LPCTSTR lpszCaption,
LPCTSTR lpszTitle,
LPCTSTR lpszInitialPath,
CWnd* pParent)
{
m_hWnd=NULL;
m_PathDialogSub.m_pPathDialog= this;
m_bParentDisabled = FALSE;
// Get the true parent of the dialog
m_pParentWnd = CWnd::GetSafeOwner(pParent);
m_lpszCaption = lpszCaption;
m_lpszInitialPath = lpszInitialPath;
memset(&m_bi, 0, sizeof(BROWSEINFO) );
m_bi.hwndOwner = (m_pParentWnd==NULL)?NULL:m_pParentWnd->GetSafeHwnd();
m_bi.pszDisplayName = 0;
m_bi.pidlRoot = 0;
m_bi.ulFlags = BIF_RETURNONLYFSDIRS | BIF_STATUSTEXT;
m_bi.lpfn = BrowseCallbackProc;
m_bi.lpszTitle = lpszTitle;
}
/////////////////////////////////////////////////////////////////////////////
// CPathDialog message handlers
CString CPathDialog::GetPathName()
{
return CString(m_szPathName);
}
int CALLBACK CPathDialog::BrowseCallbackProc(HWND hwnd,UINT uMsg,LPARAM lParam, LPARAM pData)
{
CPathDialog* pDlg = (CPathDialog*)pData;
switch(uMsg)
{
case BFFM_INITIALIZED:
{
RECT rc;
HWND hEdit;
HFONT hFont;
pDlg->m_hWnd = hwnd;
if(pDlg->m_lpszCaption!=NULL)
{
::SetWindowText(hwnd, pDlg->m_lpszCaption);
}
VERIFY(pDlg->m_PathDialogSub.SubclassWindow(hwnd));
::ShowWindow(::GetDlgItem(hwnd, IDC_STATUSTEXT), SW_HIDE);
::GetWindowRect(::GetDlgItem(hwnd, IDC_FOLDERTREE), &rc);
rc.bottom = rc.top - 4;
rc.top = rc.bottom - 23;
::ScreenToClient(hwnd, (LPPOINT)&rc);
::ScreenToClient(hwnd, ((LPPOINT)&rc)+1);
hEdit = ::CreateWindowEx(WS_EX_CLIENTEDGE, _T("EDIT"), _T(""),
WS_CHILD|WS_TABSTOP|WS_VISIBLE|ES_AUTOHSCROLL,
rc.left, rc.top,
rc.right-rc.left, rc.bottom-rc.top,
hwnd, NULL, NULL, NULL);
::SetWindowLong(hEdit, GWL_ID, IDC_NEW_EDIT_PATH);
::ShowWindow(hEdit, SW_SHOW);
hFont = (HFONT)::SendMessage(hwnd, WM_GETFONT, 0, 0);
::SendMessage(hEdit, WM_SETFONT, (WPARAM)hFont, MAKELPARAM(TRUE, 0));
LPCTSTR lpszPath = pDlg->m_lpszInitialPath;
TCHAR szTemp[MAX_PATH];
if(lpszPath==NULL)
{
::GetCurrentDirectory(MAX_PATH, szTemp );
lpszPath = szTemp;
}
// WParam is TRUE since you are passing a path.
// It would be FALSE if you were passing a pidl.
::SendMessage(hwnd,BFFM_SETSELECTION,TRUE,
(LPARAM)lpszPath);
break;
}
case BFFM_SELCHANGED:
{
char szSelection[MAX_PATH];
if(!::SHGetPathFromIDList((LPITEMIDLIST)lParam, szSelection) ||
szSelection[1]!=':')
{
szSelection[0] = '\0';
::SendMessage(hwnd, BFFM_ENABLEOK, 0, FALSE);
}
else
{
::SendMessage(hwnd, BFFM_ENABLEOK, 0, TRUE);
}
::SendMessage(hwnd,BFFM_SETSTATUSTEXT,0,(LPARAM)szSelection);
::SetWindowText(::GetDlgItem(hwnd, IDC_NEW_EDIT_PATH), szSelection);
break;
}
default:
break;
}
return 0;
}
int CPathDialog::DoModal()
{
/////////////////////////////////////////////////////////
TCHAR szPathTemp[MAX_PATH];
m_bi.lpfn = BrowseCallbackProc; // address of callback function
m_bi.lParam = (LPARAM)this; // pass address of object to callback function
m_bi.pszDisplayName = szPathTemp;
LPITEMIDLIST pidl;
LPMALLOC pMalloc;
int iResult=-1;
if(SUCCEEDED(SHGetMalloc(&pMalloc)))
{
// if((m_pParentWnd!=NULL) && m_pParentWnd->IsWindowEnabled())
// {
// m_pParentWnd->EnableWindow(FALSE);
// m_bParentDisabled = TRUE;
// }
m_bGetSuccess = FALSE;
pidl = SHBrowseForFolder(&m_bi);
if (pidl!=NULL)
{
//not need do this because OnOK function did
//bSucceeded = SHGetPathFromIDList(pidl, m_szPathName);
// In C++:
pMalloc->Free(pidl);
//In C:
//pMalloc->lpVtbl->Free(pMalloc,pidl);
//pMalloc->lpVtbl->Release(pMalloc);
}
if(m_bGetSuccess)
{
iResult = IDOK;
}
pMalloc->Release();
}
if(m_bParentDisabled && (m_pParentWnd!=NULL))
{
m_pParentWnd->EnableWindow(TRUE);
}
m_bParentDisabled=FALSE;
return iResult;
}
BOOL CPathDialog::IsFileNameValid(LPCTSTR lpFileName)
{
if(lpFileName==NULL)
{
return FALSE;
}
int nLen = _tcslen(lpFileName);
if(nLen<=0)
{
return FALSE;
}
//check first char
switch(lpFileName[0])
{
case _T('.'):
case _T(' '):
case _T('\t'):
return FALSE;
}
//check last char
switch(lpFileName[nLen-1])
{
case _T('.'):
case _T(' '):
case _T('\t'):
return FALSE;
}
//check all
int i=0;
while(lpFileName[i]!=0)
{
switch(lpFileName[i])
{
case _T('\\'):
case _T('/'):
case _T(':'):
case _T('*'):
case _T('?'):
case _T('\"'):
case _T('<'):
case _T('>'):
case _T('|'):
return FALSE;
}
i++;
}
return TRUE;
}
const TCHAR c_FolderDoesNotExist[] = _T(
"The folder:\n\n"
"%s\n\n"
"does not exist. Do you want the folder to be created?");
const TCHAR c_szErrInvalidPath[] = _T(
"The folder:"
"\n\n"
"%s\n\n"
"is invalid. Please reenter.");
const TCHAR c_szErrCreatePath[] = _T(
"The folder:"
"\n\n"
"%s"
"\n\ncan not be created. Please double check.");
//return -1: user break;
//return 0: no error
//return 1: lpPath is invalid
//return 2: can not create lpPath
int CPathDialog::MakeSurePathExists(LPCTSTR lpPath)
{
CString strMsg;
int iRet;
try
{
//validate path
iRet=Touch(lpPath, TRUE);
if(iRet!=0)
{
throw iRet;
}
if(_taccess(lpPath, 0)==0)
{
return (int)0;
}
strMsg.Format(c_FolderDoesNotExist, lpPath);
if(AfxMessageBox(strMsg, MB_YESNO|MB_ICONQUESTION) != IDYES)
{
return (int)-1;
}
//create path
iRet=Touch(lpPath, FALSE);
if(iRet!=0)
{
throw iRet;
}
return 0;
}
catch(int nErrCode)
{
switch(nErrCode)
{
case 1:
strMsg.Format(c_szErrInvalidPath, lpPath);
break;
case 2:
default:
strMsg.Format(c_szErrCreatePath, lpPath);
break;
}
AfxMessageBox(strMsg, MB_OK|MB_ICONEXCLAMATION);
}
return iRet;
}
//return 0: no error
//return 1: lpPath is invalid
//return 2: lpPath can not be created(bValidate==FALSE)
int CPathDialog::Touch(LPCTSTR lpPath, BOOL bValidate)
{
if(lpPath==NULL)
{
return 1;
}
TCHAR szPath[MAX_PATH];
_tcscpy(szPath, lpPath);
int nLen = _tcslen(szPath);
//path must be "x:\..."
if( ( nLen<3 ) ||
( ( szPath[0]<_T('A') || _T('Z')<szPath[0] ) &&
( szPath[0]<_T('a') || _T('z')<szPath[0] ) ||
( szPath[1]!=_T(':') )||
( szPath[2]!=_T('\\') )
)
)
{
return 1;
}
int i;
if(nLen==3)
{
if(!bValidate)
{
if(_access(szPath, 0)!=0)
{
return 2;
}
}
return 0;
}
i = 3;
BOOL bLastOne=TRUE;
LPTSTR lpCurrentName;
while(szPath[i]!=0)
{
lpCurrentName = &szPath[i];
while( (szPath[i]!=0) && (szPath[i]!=_T('\\')) )
{
i++;
}
bLastOne =(szPath[i]==0);
szPath[i] = 0;
if( !IsFileNameValid(lpCurrentName) )
{
return 1;
}
if(!bValidate)
{
CreateDirectory(szPath, NULL);
if(_taccess(szPath, 0)!=0)
{
return 2;
}
}
if(bLastOne)
{
break; //it's done
}
else
{
szPath[i] = _T('\\');
}
i++;
}
return (bLastOne?0:1);
}
//return 0: ok
//return 1: error
int CPathDialog::ConcatPath(LPTSTR lpRoot, LPCTSTR lpMorePath)
{
if(lpRoot==NULL)
{
return 1;
}
int nLen = _tcslen(lpRoot);
if(nLen<3)
{
return 1;
}
if(lpMorePath==NULL)
{
return 0;
}
if(nLen==3)
{
_tcscat(lpRoot, lpMorePath);
return 0;
}
_tcscat(lpRoot, _T("\\"));
_tcscat(lpRoot, lpMorePath);
return 0;
}
///////////////////////////////////////////////////////////////////////
在工程中加入 Pathdialog.h 和 Pathdialog.cpp 后，调用代码如下：
#include "PathDialog.h"
void CTestPathDialogDlg::OnBrowserButton()
{
CString strInitialPath;
CString strYourCaption(_T("Your caption here..."));
CString strYourTitle(_T("Your tilte here..."));
m_ctrlPathName.GetWindowText(strInitialPath);
CPathDialog dlg(strYourCaption, strYourTitle, strInitialPath);
if (dlg.DoModal()==IDOK)
{
m_ctrlPathName.SetWindowText(dlg.GetPathName());
}
}
void CTestPathDialogDlg::OnOKButton()
{
CString strPath;
m_ctrlPathName.GetWindowText(strPath);
if(CPathDialog::MakeSurePathExists(strPath)==0)
{
CDialog::OnOK();
}
}
补充说明：本例中选择路径对话框不带有“新建文件夹”功能，需要的话可以参照：http://www.vccode.com/file_show.php?id=2661上的范例.
