如何HOOK桌面窗口消息

如何HOOK桌面窗口消息. 截获桌面窗口鼠标单击事件，解析所选中的桌面 Item，并将解析后的 item 信息发送给主调程序，并将信息显示在一个窗口上面

#include “CommonDef.h“
#include “DesktopHook.h“
#include “FloatWin.h“

const UINT WM_DESKTOP_CLICKED_ITEM = RegisterWindowMessage（L“WM_DESKTOP_CLICKED_ITEM“）;

BOOL g_isCaptured = FALSE;
CFloatWin* g_floatWin = NULL;

INT_PTR WINAPI DlgProc（HWND hwnd UINT uMsg WPARAM wParam LPARAM lParam） ;

int WINAPI _tWinMain（HINSTANCE hinstExe HINSTANCE PTSTR pszCmdLine int）
{
    HWND hwnd = FindWindow（TEXT（“#32770“） TEXT（“DesktopCaptor2“））;
    if （IsWindow（hwnd））
    {
        // An instance is already running show a messagebox
        MessageBox（GetForegroundWindow（） L“An instance is already running“ L“Error“ MB_IConerror）;
    } 
    else 
    {
        DialogBox（hinstExe MAKEINTRESOURCE（IDD_DESKTOP_CAPTOR） NULL DlgProc）;
    }
    return（0）;
}

INT_PTR CALLBACK DlgProc（HWND hDlg UINT message WPARAM wParam LPARAM lParam）
{
    UNREFERENCED_PARAMETER（lParam）;
    switch （message）
    {
    case WM_INITDIALOG:
        {
            // Set icon for the application
            SendMessage（hDlg WM_SETICON ICON_BIG  （LPARAM） 
                LoadIcon（（HINSTANCE） GetWindowLongPtr（hDlg GWLP_HINSTANCE） 
                MAKEINTRESOURCE（IDI_DESKTOPCAPTOR2）））;

            // Set dialog‘s position
            int nScreenWidth = ::GetSystemMetrics（SM_CXSCREEN）;
            int nScreenHeight = ::GetSystemMetrics（SM_CYSCREEN）;
            RECT rect = { 0 };
            GetWindowRect（hDlg &rect）;
            SetWindowPos（
                hDlg 
                HWND_TOP 
                nScreenWidth - （rect.right - rect.left） 
                0 
                0 0 
                SWP_NOSIZE）;

            g_floatWin = CFloatWin::getInstance（）;
        }
        return （INT_PTR）TRUE;

    case WM_COMMAND:
        {
            UINT wmId = LOWORD（wParam）;
            UINT wmEvent = HIWORD（wParam）;

            switch （wmId）
            {
            case IDOK:
            case IDCANCEL:
                EndDialog（hDlg LOWORD（wParam））;
                return （INT_PTR）TRUE;
            case IDC_START_CAPTOR:
                if （FALSE == g_isCaptured）
                {
                    g_isCaptured = CreateDesktopEventCaptor（hDlg）;
                }
                break;
            case IDC_STOP_CAPTOR:
                if （TRUE == g_isCaptured）
                {
                    CloseDesktopEventCaptor（）;
                    g_isCaptured = FALSE;
                }
                break;
            default:
                return DefWindowProc（hDlg message wParam lParam）;
            }
        }
        break;
    case WM_COPYDATA:
        {
            COPYDATASTRUCT* pCopyData = （COPYDATASTRUCT*）lParam;
            if （pCopyData->dwData == WM_DESKTOP_CLICKED_ITEM）
            {
                DesktopItemData itemData（*（DesktopItemData*）pCopyData->lpData）;
                g_floatWin->ShowWindow（TRUE &itemData）;
            }
        }
      

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2011-07-17 01:57  DesktopCaptor\
     目录           0  2011-07-17 01:57  DesktopCaptor\Debug\
     文件      199168  2011-07-17 01:56  DesktopCaptor\Debug\DesktopCaptor2.exe
     文件       53760  2011-07-17 01:56  DesktopCaptor\Debug\DesktopHook.dll
     文件        1534  2011-07-15 17:13  DesktopCaptor\DesktopCaptor.sln
     文件        8192  2011-07-17 01:57  DesktopCaptor\DesktopCaptor.suo
     目录           0  2011-07-17 01:57  DesktopCaptor\DesktopCaptor2\
     文件        1309  2011-07-11 04:28  DesktopCaptor\DesktopCaptor2\CommonDef.h
     文件        3046  2011-07-15 17:16  DesktopCaptor\DesktopCaptor2\DesktopCaptor2.cpp
     文件      127493  2009-06-23 14:57  DesktopCaptor\DesktopCaptor2\DesktopCaptor2.ico
     文件        2952  2011-07-11 05:28  DesktopCaptor\DesktopCaptor2\DesktopCaptor2.rc
     文件        4399  2011-07-11 05:28  DesktopCaptor\DesktopCaptor2\DesktopCaptor2.vcproj
     文件        3107  2011-07-11 07:38  DesktopCaptor\DesktopCaptor2\FloatWin.cpp
     文件         581  2011-07-11 07:39  DesktopCaptor\DesktopCaptor2\FloatWin.h
     文件         595  2011-07-11 05:22  DesktopCaptor\DesktopCaptor2\resource.h
     目录           0  2011-07-17 01:57  DesktopCaptor\DesktopHook\
     文件        6201  2011-07-17 00:13  DesktopCaptor\DesktopHook\DesktopHook.cpp
     文件         143  2011-07-10 19:49  DesktopCaptor\DesktopHook\DesktopHook.def
     文件        1754  2011-07-15 17:21  DesktopCaptor\DesktopHook\DesktopHook.h
     文件        5324  2011-07-15 18:09  DesktopCaptor\DesktopHook\DesktopHook.vcproj
     文件        2530  2011-07-15 18:09  DesktopCaptor\DesktopHook\DesktopItem.cpp
     文件         978  2011-07-11 02:07  DesktopCaptor\DesktopHook\DesktopItem.h
     文件         464  2011-07-10 20:29  DesktopCaptor\DesktopHook\dllmain.cpp
     文件        1779  2011-07-10 16:51  DesktopCaptor\DesktopHook\ReadMe.txt
     文件         298  2011-07-10 16:51  DesktopCaptor\DesktopHook\stdafx.cpp
     文件         664  2011-07-11 01:32  DesktopCaptor\DesktopHook\stdafx.h
     文件        1428  2011-07-10 16:51  DesktopCaptor\DesktopHook\targetver.h