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            天下

            記錄修行的印記

            為SHBrowseForFolder指定初始目錄

            SHBrowseForFolder可以用來得到一個用戶選擇的目錄。

            可是有時候會有需要去指定一個初始目錄,比如希望上次用戶選擇的目錄可以保存下來。這該如何去做?

            在BROWSEINFO結構體中提供了一個成員,這是一個指向函數的指針,通過這個回調函數,可以處理初始化的時候需要做的一些事情。

            其中函數名是固定的:BrowseCallbackProc()

            BrowseCallbackProc Function


            Specifies an application-defined callback function used to send messages to, and process messages from, a Browse dialog box displayed in response to a call to SHBrowseForFolder.

            Syntax

            int CALLBACK BrowseCallbackProc(      
                HWND hwnd,
                UINT uMsg,
                LPARAM lParam,
                LPARAM lpData
            );

            Parameters

            hwnd
            The window handle of the browse dialog box.
            uMsg
            The dialog box event that generated the message. One of the following values.
            BFFM_INITIALIZED
            The dialog box has finished initializing.
            BFFM_IUNKNOWN
            An IUnknown interface is available to the dialog box.
            BFFM_SELCHANGED
            The selection has changed in the dialog box.
            BFFM_VALIDATEFAILED
            Version 4.71. The user typed an invalid name into the dialog's edit box. A nonexistent folder is considered an invalid name.
            lParam
            A value whose meaning depends on the event specified in uMsg as follows:
            uMsg lParam
            BFFM_INITIALIZED Not used, value is NULL.
            BFFM_IUNKNOWN A pointer to an IUnknown interface.
            BFFM_SELCHANGED A pointer to an item identifier list (PIDL) identifying the newly selected item.
            BFFM_VALIDATEFAILED A pointer to a string containing the invalid name. An application can use this data in an error dialog informing the user that the name was not valid.
            lpData
            An application-defined value that was specified in the lParam member of the BROWSEINFO structure used in the call to SHBrowseForFolder.

            Return Value

            Returns zero except in the case of BFFM_VALIDATEFAILED. For that flag, returns zero to dismiss the dialog or nonzero to keep the dialog displayed.

            Remarks

            To attach your BrowseCallbackProc to a dialog, specify its address in the lpfn member of the BROWSEINFO structure used in a SHBrowseForFolder call.

            BrowseCallbackProc can also send messages to the dialog box through SendMessage, controlling these aspects of that dialog box.

            • OK button enabled/disabled
            • OK button text
            • Selected folder
            • Expanded folder
            • Status text
            Set the SendMessage function's Msg parameter to one of the following values, providing additional information in the wParam and lParam parameters as indicated for each message type.

            BFFM_ENABLEOK

            Enables or disables the dialog box's OK button.

            • wParam. Not used.
            • lParam. To enable, set to a nonzero value. To disable, set to zero.

            BFFM_SETOKTEXT

            Version 6.0. Sets the text that is displayed on the dialog box's OK button.

            • wParam. Not used.
            • lParam. A pointer to a null-terminated Unicode string containing the desired text.

            BFFM_SETSELECTION

            Specifies the path of a folder to select. The path can be specified as a string or a PIDL.

            To use a string:

            • wParam. Set to TRUE.
            • lParam. A pointer to the null-terminated Unicode string that specifies the path.

            To use a PIDL:

            • wParam. Set to FALSE.
            • lParam. The PIDL that specifies the path.

            BFFM_SETEXPANDED

            Version 6.0. Specifies the path of a folder to expand in the Browse dialog box. The path can be specified as a Unicode string or a PIDL.

            To use a Unicode string:

            • wParam. Set to TRUE
            • lParam. A pointer to the null-terminated Unicode string that specifies the path.

            To use a PIDL:

            • wParam. Set to FALSE
            • lParam. The PIDL that specifies the path.

            BFFM_SETSTATUSTEXT

            Sets the status text. Set lpData to point to a null-terminated string with the desired text.

            • wParam. Not used.
            • lParam. A pointer to a null-terminated string containing the desired text.
            具體寫法如下:

             

            int CALLBACK BrowseCallbackProc(HWND hwnd, UINT uMsg, LPARAM lParam, LPARAM lpData)   
            {   
                
            if  (uMsg == BFFM_INITIALIZED )
                {   
                    ::SendMessage(hwnd,BFFM_SETSELECTION,TRUE,lpData);   
                }   
                
            return 0;  
            }
             

                //使用:
                CString strLastPath = GetLastOpenDirectory();
                LPITEMIDLIST pidlRoot 
            = NULL;

                BROWSEINFO bi;
                ZeroMemory(
            &bi,sizeof(BROWSEINFO));
                bi.hwndOwner    
            = GetSafeHwnd();
                bi.lpszTitle    
            = _T("請選擇目錄");
                bi.ulFlags      
            = BIF_RETURNONLYFSDIRS | BIF_USENEWUI | BIF_NONEWFOLDERBUTTON; 
                bi.lpfn         
            = NULL;
                bi.pidlRoot     
            = pidlRoot;
                bi.lParam       
            = (LPARAM)strLastPath.GetBuffer();
                bi.lpfn         
            = BrowseCallbackProc;

                if(pidl == NULL)
                    return;

                SHGetPathFromIDList(pidl, csPath.GetBuffer(MAX_PATH));
                csPath.ReleaseBuffer();


            posted on 2010-12-13 17:49 天下 閱讀(2336) 評論(0)  編輯 收藏 引用 所屬分類: Win32

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