SOUI中啓用拖文件

    本文所用SOUI版本爲1.0版本，在拖文件上與通常的消息略有不一樣。

1.添加拖文件消息響應

先與常規添加消息相同。

class CMainFrm : public SHostWnd
{
public:
    CMainFrm(void);
    ~CMainFrm(void);
    
    void OnDropFile(HDROP hDropInfo)
    {
        SetMsgHandled(FALSE);

        UINT  nFileCount = ::DragQueryFile(hDropInfo, (UINT)-1, NULL, 0);
        TCHAR szFileName[_MAX_PATH] = _T("");
        DWORD dwAttribute;

        // 獲取拖拽進來文件和文件夾
        for (UINT i = 0; i < nFileCount; i++)
        {
            ::DragQueryFile(hDropInfo, i, szFileName, sizeof(szFileName));
            dwAttribute = ::GetFileAttributes(szFileName);

            // 是否爲文件夾
            if ( dwAttribute & FILE_ATTRIBUTE_DIRECTORY )
            {          
                SMessageBox(m_hWnd, "注意：不支持拖拽添加文件夾", "系統提示", MB_OK|MB_ICONWARNING);
            }
            else
            {
                std::string file_path = szFileName;
                
                //添加代碼...........
            }
        }
        ::DragFinish(hDropInfo);
        
    }
    
    void OnClose() ;
    
protected:
    //soui消息
    EVENT_MAP_BEGIN()
        EVENT_NAME_COMMAND(L"btn_close", OnClose)
    EVENT_MAP_END()

    //HostWnd真實窗口消息處理
    BEGIN_MSG_MAP_EX(CMainFrm)
        MSG_WM_DROPFILES(OnDropFile)
    CHAIN_MSG_MAP(SHostWnd)
    REFLECT_NOTIFICATIONS_EX()
    END_MSG_MAP()
}

到這裏完成了SOUI添加消息的比較完整的過程。可是發現窗口並不響應拖文件。

2.使窗口能夠拖文件

參考簡單方法解決Vista/Win7 沒法接收WM_DROPFILES問題 ，添加以下函數

BOOL ChangeWndMessageFilter(UINT uMessage, BOOL bAllow)
{
    typedef BOOL (WINAPI* ChangeWindowMessageFilterFn)(UINT, DWORD);  
    HMODULE hUserMod = NULL;  
    BOOL bResult = FALSE;  
    hUserMod = LoadLibrary( "user32.dll" );  
    if ( hUserMod == NULL )  
    {  
        return FALSE;  
    }  

    // 獲取ChangeWindowMessageFilter函數接口指針  
    ChangeWindowMessageFilterFn pfnChangeWindowMessageFilter = (ChangeWindowMessageFilterFn)GetProcAddress( hUserMod, "ChangeWindowMessageFilter" );  
    if ( pfnChangeWindowMessageFilter == NULL )  
    {  
        FreeLibrary( hUserMod );  
        return FALSE;  
    }  

    bResult = pfnChangeWindowMessageFilter( uMessage, bAllow?1:2 ); // 1-MSGFLT_ADD, 2-MSGFLT_REMOVE  
    FreeLibrary( hUserMod );  
    return bResult;  
}

而後在初始化函數中添加以下：

BOOL OnInitDialog(HWND wndFocus, LPARAM lInitParam)
{
    SetMsgHandled(FALSE);

    shellNotifyIcon.Create(m_hWnd,GETRESPROVIDER->LoadIcon(_T("ICON_LOGO"),16));
    shellNotifyIcon.Show();

    m_bLayoutInited=TRUE;

    //拖文件相關
    DragAcceptFiles(m_hWnd, TRUE);
    ChangeWndMessageFilter(0x0049, MSGFLT_ADD);
    ChangeWndMessageFilter(WM_DROPFILES, MSGFLT_ADD);
    
    return TRUE;
}

這樣就實現了文件拖曳。

完整代碼以下：

class CMainFrm : public SHostWnd
{
public:
    CMainFrm(void);
    ~CMainFrm(void);
    
    BOOL ChangeWndMessageFilter(UINT uMessage, BOOL bAllow)
    {
        typedef BOOL (WINAPI* ChangeWindowMessageFilterFn)(UINT, DWORD);  
        HMODULE hUserMod = NULL;  
        BOOL bResult = FALSE;  
        hUserMod = LoadLibrary( "user32.dll" );  
        if ( hUserMod == NULL )  
        {  
            return FALSE;  
        }  

        // 獲取ChangeWindowMessageFilter函數接口指針  
        ChangeWindowMessageFilterFn pfnChangeWindowMessageFilter = (ChangeWindowMessageFilterFn)GetProcAddress( hUserMod, "ChangeWindowMessageFilter" );  
        if ( pfnChangeWindowMessageFilter == NULL )  
        {  
            FreeLibrary( hUserMod );  
            return FALSE;  
        }  

        bResult = pfnChangeWindowMessageFilter( uMessage, bAllow?1:2 ); // 1-MSGFLT_ADD, 2-MSGFLT_REMOVE  
        FreeLibrary( hUserMod );  
        return bResult;  
    }
    
    BOOL OnInitDialog(HWND wndFocus, LPARAM lInitParam)
    {
        SetMsgHandled(FALSE);

        m_bLayoutInited=TRUE;

        //拖文件相關
        DragAcceptFiles(m_hWnd, TRUE);
        ChangeWndMessageFilter(0x0049, MSGFLT_ADD);
        ChangeWndMessageFilter(WM_DROPFILES, MSGFLT_ADD);
        
        return TRUE;
    }

    
    void OnDropFile(HDROP hDropInfo)
    {
        SetMsgHandled(FALSE);

        UINT  nFileCount = ::DragQueryFile(hDropInfo, (UINT)-1, NULL, 0);
        TCHAR szFileName[_MAX_PATH] = _T("");
        DWORD dwAttribute;

        // 獲取拖拽進來文件和文件夾
        for (UINT i = 0; i < nFileCount; i++)
        {
            ::DragQueryFile(hDropInfo, i, szFileName, sizeof(szFileName));
            dwAttribute = ::GetFileAttributes(szFileName);

            // 是否爲文件夾
            if ( dwAttribute & FILE_ATTRIBUTE_DIRECTORY )
            {          
                SMessageBox(m_hWnd, "注意：不支持拖拽添加文件夾", "系統提示", MB_OK|MB_ICONWARNING);
            }
            else
            {
                std::string file_path = szFileName;
                
                //添加代碼...........
            }
        }
        ::DragFinish(hDropInfo);
        
    }
    
    void OnClose() ;
    
protected:
    //soui消息
    EVENT_MAP_BEGIN()
        EVENT_NAME_COMMAND(L"btn_close", OnClose)
    EVENT_MAP_END()

    //HostWnd真實窗口消息處理
    BEGIN_MSG_MAP_EX(CMainFrm)
    MSG_WM_INITDIALOG(OnInitDialog)
        MSG_WM_DROPFILES(OnDropFile)
    CHAIN_MSG_MAP(SHostWnd)
    REFLECT_NOTIFICATIONS_EX()
    END_MSG_MAP()
    
private:
    BOOL        m_bLayoutInited;/**<UI完成佈局標誌 */
}