C++ 虚拟桌面

C++ 打开一个虚拟桌面的代码

看不明白的地方 请查看demo: http://download.csdn.net/detail/allh45601/7224205

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// Run.cpp : 定义应用程序的入口点。
//

#include "stdafx.h"
#include "Run.h"
#include <atlstr.h>

#include "shellapi.h"
#pragma comment("lib", "shell32.lib");

#define dim(x) (sizeof(x) / sizeof(x[0]))

// 全局变量:
HINSTANCE g_hInst            = NULL;                    // 当前实例
TCHAR     g_szTitle[]        = TEXT("Running");        // 窗口名称
TCHAR     g_szWindowClass[] = TEXT("Run-2012");        // 主窗口类名
HWND      g_hWnd            = NULL;
CString   g_strDirPath;                                // 注册dll批处理路径
    
HDESK  g_hPreDesk = NULL;        // 原始桌面
HDESK  g_hVirtualDesk = NULL;    // 虚拟桌面
HANDLE g_hEvent = NULL;


LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
LRESULT OnShowWindow (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
LRESULT OnCreate (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
LRESULT OnDestroy (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
LRESULT GoVirualDesk (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
LRESULT GoPreviousDesk (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

struct MSGMAP_ENTRY
{
    UINT nMessage;
    LRESULT (*pfn) (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
};

struct MSGMAP_ENTRY _messageEntries[] =
{
    WM_DESTROY, OnDestroy,
    WM_SHOWWINDOW, OnShowWindow,
    WM_CREATE, OnCreate,
    GO_VIRTUAL_DESK, GoVirualDesk,
    GO_PREVIOUS_DESK, GoPreviousDesk,
};

// 此代码模块中包含的函数的前向声明:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
void Run (void);
void GoPreDeskThread (void);

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    MyRegisterClass(hInstance);

    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}

LRESULT CALLBACK WindowProc( HWND hwnd,    UINT uMsg, WPARAM wParam, LPARAM lParam)
{
     for (int i=0; i<dim(_messageEntries); i++)
     {
         if (uMsg == _messageEntries[i].nMessage)
         {
             return (*_messageEntries[i].pfn)(hwnd, uMsg, wParam, lParam);
         }
     }
    
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

LRESULT OnShowWindow (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    Run();
    return 0;
}

LRESULT OnCreate (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    // 删除WS_EX_APPWINDOW风格
    LONG lStyle = ::GetWindowLong(hwnd, GWL_EXSTYLE);
    ::SetWindowLong(hwnd, GWL_EXSTYLE, lStyle & ~WS_EX_APPWINDOW);

    // 添加WS_EX_TOOLWINDOW
    lStyle = ::GetWindowLong(hwnd, GWL_EXSTYLE);
    ::SetWindowLong(hwnd, GWL_EXSTYLE, lStyle | WS_EX_TOOLWINDOW);

    return 0;
}

LRESULT OnDestroy (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    CloseDesktop(g_hVirtualDesk);
    CloseHandle(g_hEvent);

    HANDLE hEvent = OpenEvent(EVENT_ALL_ACCESS, FALSE, _T("Run_EXE_EXIT"));
    if (hEvent)
    {
        SetEvent(hEvent);
    }

    PostQuitMessage(0);
    return 0;
}

LRESULT GoVirualDesk (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    SwitchDesktop(g_hVirtualDesk);
    return 0;
}

LRESULT GoPreviousDesk (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    SwitchDesktop(g_hPreDesk);
    return 0;
}

void Run (void)
{
    HANDLE hHand = CreateThread(NULL, 0, LPTHREAD_START_ROUTINE(GoPreDeskThread), NULL, 0, NULL);
    CloseHandle(hHand);

    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    TCHAR DeskName[]= _T("RUNNING");

    g_hPreDesk = GetThreadDesktop(GetCurrentThreadId());
    g_hVirtualDesk = CreateDesktop( DeskName, NULL, NULL, DF_ALLOWOTHERACCOUNTHOOK, GENERIC_ALL, NULL);

    SetThreadDesktop(g_hVirtualDesk);

    ZeroMemory( &si, sizeof(si) );  
    si.cb = sizeof(si); 
    si.lpDesktop = DeskName; 
    si.wShowWindow = SW_SHOW;
    si.dwFlags = STARTF_USESHOWWINDOW;
    ZeroMemory( &pi, sizeof(pi) );

    TCHAR strPath[MAX_PATH] = {0};
    GetModuleFileName(NULL, strPath, MAX_PATH);
    TCHAR dir[_MAX_DIR] = {0};
    TCHAR drive[_MAX_DIR] = {0};
    _tsplitpath(strPath, drive, dir, NULL, NULL);

    CString strDirPath(drive);
    strDirPath += dir;
    strDirPath += _T("GoPreviousDeskTop.exe");

    CreateProcess(strDirPath, NULL, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi);

    CStringA strBuffer;
    strBuffer.Format("%s %d", "GoVirtualDeskTop.exe", g_hWnd);
    WinExec(strBuffer, SW_SHOW);
}

void GoPreDeskThread (void)
{
    while(true)
    {
        g_hEvent = NULL;
        g_hEvent = CreateEvent(NULL, FALSE, FALSE, _T("GoPreviousDeskTop_2012"));
        WaitForSingleObject(g_hEvent, INFINITE);
        SwitchDesktop(g_hPreDesk);
    }
}

ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASS wndClass;
    wndClass.style = CS_HREDRAW | CS_VREDRAW;
    wndClass.lpfnWndProc = WindowProc;
    wndClass.cbClsExtra = 0;
    wndClass.cbWndExtra = 0;
    wndClass.hInstance = hInstance;
    wndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndClass.lpszMenuName = NULL;
    wndClass.lpszClassName = g_szWindowClass;

    return RegisterClass(&wndClass);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    g_hInst = hInstance; // 将实例句柄存储在全局变量中

    g_hWnd = CreateWindow(g_szWindowClass, g_szTitle, WS_POPUP,
        -1, -1, 0, 0, NULL, NULL, hInstance, NULL);

    if (!g_hWnd)
    {
        return FALSE;
    }

    ShowWindow(g_hWnd, nCmdShow);
    UpdateWindow(g_hWnd);

    return TRUE;
}