在CFileDialog对话框中添加控件关键字：CFileDialog扩展类，OFNHookProc需求描述：昨天遇到一个用户需求，在CFileDialog对话框（SAVE）中加入一个Check,一个Edit，一个Spin控件，dlg.Domodal()==IDOK返回时要同时获得Edit控件中的数据.实现方法：如果只需要控制控件，用方法一即可，但如果需要获取数据，则只能用方法二。我最终用的就是方法二.方法一:首先查找MSDN关于CFileDialog扩展的实现描述，上网查到实现预览图片式的CFILEDIALOG的例子。按照其思路从CFileDialog派生了一个新的类CFileDialogEX.在类中添加以下代码#defineWM_CHECKZOOMINWM_USER+1856public:BOOLbZoomIn;UINTnMul;//[1~100]//前置声明---------------BOOLNEARCALLBACKHandleNotify(HWNDhDlg,LPOFNOTIFYpofn);UINT_PTRCALLBACKOFNHookProc(HWNDhDlg,UINTuMsg,WPARAMwParam,LPARAMlParam);//CFileDialogExIMPLEMENT_DYNAMIC(CFileDialogEx,CFileDialog)CFileDialogEx::CFileDialogEx(BOOLbOpenFileDialog,LPCTSTRlpszDefExt,LPCTSTRlpszFileName,DWORDdwFlags,LPCTSTRlpszFilter,CWnd*pParentWnd):CFileDialog(bOpenFileDialog,lpszDefExt,lpszFileName,dwFlags,lpszFilter,pParentWnd){//这个四个常用标识位m_ofn.Flags|=OFN_ENABLETEMPLATE|OFN_HIDEREADONLY|OFN_EXPLORER;//OFN_EXPLORER|OFN_ENABLEHOOKm_ofn.lpstrTitle=_T("高级保存对话框");m_ofn.hInstance=AfxGetInstanceHandle();m_ofn.lpstrFilter=_T("*.bmp\0*.BMP\0所有文件\0*.*\0");m_ofn.lpTemplateName=MAKEINTRESOURCE(IDD_FILEDIALOG_EX);m_ofn.lpfnHook=(LPOFNHOOKPROC)OFNHookProc;}//HookfunctionfortheCommDlg//在这里处理我们感兴趣的消息，想要哪个，截哪个!UINT_PTRCALLBACKOFNHookProc(HWNDhDlg,UINTuMsg,WPARAMwParam,LPARAMlParam){switch(uMsg){caseWM_INITDIALOG://初始化对话框上的控件if(SendDlgItemMessage(hDlg,IDC_CHECK_ZOOMIN,BM_GETCHECK,0,0)==BST_UNCHECKED){::EnableWindow(GetDlgItem(hDlg,IDC_EDIT_ZOOMNUM),FALSE);::EnableWindow(GetDlgItem(hDlg,IDC_SPIN_ZOOMNUM),FALSE);::SetWindowText(GetDlgItem(hDlg,IDC_EDIT_ZOOMNUM),_T("1"));//ShowWindow(button,SW_HIDE);}break;caseWM_DESTROY://消毁对话框{LPOPENFILENAMElpOFN=(LPOPENFILENAME)GetWindowLong(hDlg,DWL_USER);}break;caseWM_COMMAND://这里处理，IDC_CHECK_ZOOMIN命令{if((HIWORD(wParam)==BN_CLICKED)&&(LOWORD(wParam)==IDC_CHECK_ZOOMIN)){BOOLbZoomIn=TRUE;if(SendDlgItemMessage(hDlg,IDC_CHECK_ZOOMIN,BM_GETCHECK,0,0)==BST_CHECKED){bZoomIn=TRUE;::EnableWindow(GetDlgItem(hDlg,IDC_EDIT_ZOOMNUM),TRUE);::EnableWindow(GetDlgItem(hDlg,IDC_SPIN_ZOOMNUM),TRUE);}else{bZoomIn=FALSE;//::SetWindowText(GetDlgItem(hDlg,IDC_EDIT_ZOOMNUM),"");::EnableWindow(GetDlgItem(hDlg,IDC_EDIT_ZOOMNUM),FALSE);::EnableWindow(GetDlgItem(hDlg,IDC_SPIN_ZOOMNUM),FALSE);}HWNDhParent=GetParent(hDlg);//注意hDlg是新加的模板对话框句柄，它是CFileDialog对话框的子部分，要获取CFileDialog对话框的句柄需要用GetParent函数PostMessage(hParent,WM_CHECKZOOMIN,(WPARAM)bZoomIn,(LPARAM)0);bZoomIn=FALSE;}break;caseWM_NOTIFY:HandleNotify(hDlg,(LPOFNOTIFY)lParam);break;}return0;}//这里处理notify消息BOOLNEARCALLBACKHandleNotify(HWNDhDlg,LPOFNOTIFYpofn){CFileDialogExdlg(TRUE);switch(pofn->hdr.code){caseCDN_SELCHANGE:{//charszFile[MAX_PATH];////Getthepathoftheselectedfile.//if(CommDlg_OpenSave_GetFilePath(GetParent(hDlg),szFile,sizeof(szFile))<=sizeof(szFile))//{//if(GetFileAttributes(szFile)!=FILE_ATTRIBUTE_DIRECTORY)//{////ShouldweloadthePic//if(SendDlgItemMessage(hDlg,IDC_CHECK1,BM_GETCHECK,0,0)==BST_UNCHECKED)//dlg.ShowImagepreview(hDlg,szFile);//}//}}break;caseCDN_FILEOK:{intnum;GetDlgItemInt(hDlg,IDC_EDIT_ZOOMNUM,&num,FALSE);if(SendDlgItemMessage(hDlg,IDC_CHECK_ZOOMIN,BM_GET...
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