CPathDialog 类学习方法

王朝厨房·作者佚名 2007-01-04

一个非常好用的选择目录的类

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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 controlsclass 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;// Constructionpublic: 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：

#include "stdafx.h"#include "PathDialog.h"#include <io.h>

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

#define IDC_FOLDERTREE 0x3741#define IDC_TITLE 0x3742#define IDC_STATUSTEXT 0x3743

#define IDC_NEW_EDIT_PATH 0x3744

// Class CDlgWndBEGIN_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 lpPathint 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: errorint 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.