Windows SDK 实现不规则窗口

不规则窗口在程序界面设计中能提供非常好的用户体验，以下是我程序运行时的效果图：

以下是代码,注意需要修改一些简单的位置，如资源ID，项目的头文件，图片资源等，这些是根据你创建的win32程序的项目名改变的，我的项目名为RgnWindow.

// RgnWindow.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "RgnWindow.h"
#include <comdef.h>


#define ULONG_PTR ULONG
#include <gdiplus.h>
using namespace Gdiplus;
#pragma comment(lib, "gdiplus.lib")  //注意,要保证vc路径的lib中,能够找到这个文件

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;                                // current instance
TCHAR szTitle[MAX_LOADSTRING];                    // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name
GdiplusStartupInput m_gdiplusStartupInput;
ULONG_PTR m_pGdiToken;
HWND g_hWnd = 0;
Image *g_pImageBack=0;
//透明度颜色混合选项
BLENDFUNCTION g_Blend;
//背景图的宽度和高度
int g_BakWidth, g_BakHeight;

// Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
BOOL ImageFromIDResource(UINT nID, LPCTSTR sTR, Image * & pImg);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);
void Update();


int APIENTRY _tWinMain(HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPTSTR    lpCmdLine,
    int       nCmdShow)
{
    GdiplusStartup(&m_pGdiToken,&m_gdiplusStartupInput,NULL); 

    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);

    // TODO: Place code here.
    MSG msg;
    HACCEL hAccelTable;

    // Initialize global strings
    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadString(hInstance, IDC_RGNWINDOW, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // Perform application initialization:
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_RGNWINDOW));

    // Main message loop:
    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }
    GdiplusShutdown(m_pGdiToken); 
    return (int) msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage are only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style            = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra        = 0;
    wcex.cbWndExtra        = 0;
    wcex.hInstance        = hInstance;
    wcex.hIcon            = LoadIcon(hInstance, MAKEINTRESOURCE(IDC_RGNWINDOW));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground    = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName    = MAKEINTRESOURCE(IDC_RGNWINDOW);
    wcex.lpszClassName    = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

    return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    HWND hWnd;

    hInst = hInstance; // Store instance handle in our global variable

    hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

    //hWnd=CreateWindowEx(WS_EX_TOPMOST|WS_EX_LAYERED|WS_EX_TOOLWINDOW, szWindowClass,NULL,WS_POPUP|WS_SYSMENU,
    //   0,0,300,400,NULL,NULL,hInstance,NULL);

    if (!hWnd)
    {
        return FALSE;
    }
    //初始化
    g_Blend.SourceConstantAlpha = int(0 * 2.55);//1~255
    g_Blend.BlendOp=0; //theonlyBlendOpdefinedinWindows2000
    g_Blend.BlendFlags=0; //nothingelseisspecial...
    g_Blend.AlphaFormat=1; //...
    g_Blend.SourceConstantAlpha=255;//AC_SRC_ALPHA

    DWORD dwExStyle = GetWindowLong(hWnd, GWL_EXSTYLE);
    //设置成工具窗口，无标题栏
    SetWindowLong(hWnd, GWL_STYLE, dwExStyle ^ WS_EX_TOOLWINDOW);
    //设置成层次窗口
    dwExStyle = ::GetWindowLong(hWnd, GWL_EXSTYLE);
    //if((dwExStyle & WS_EX_LAYERED) != WS_EX_LAYERED)
    //    SetWindowLong(hWnd, GWL_EXSTYLE, dwExStyle|WS_EX_TOPMOST|WS_EX_LAYERED);

    //加载图像
    //ImageFromIDResource(IDR_CLOCK, L"PNG", g_pImageBack);
    g_pImageBack =  Image::FromFile(_T("D://launcher//bx.png"));
    ImageType t = g_pImageBack->GetType();

    //bkImg.FromFile();
    g_BakWidth = g_pImageBack->GetWidth();
    g_BakHeight = g_pImageBack->GetHeight();


    g_hWnd=hWnd;


    //::SetWindowPos(g_hWnd, HWND_TOPMOST,0,0,g_BakWidth,g_BakHeight,SWP_NOSIZE|SWP_NOMOVE);

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);
    Update();

    return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND    - process the application menu
//  WM_PAINT    - Paint the main window
//  WM_DESTROY    - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;


    switch (message)
    {
    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        // Parse the menu selections:
        switch (wmId)
        {
        case IDM_ABOUT:
            DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
            break;
        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;

        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        // TODO: Add any drawing code here...
        Update();
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    case WM_LBUTTONDOWN:
        //禁止显示移动矩形窗体框
        ::SystemParametersInfo(SPI_SETDRAGFULLWINDOWS,TRUE,NULL,0);
        //非标题栏移动整个窗口
        ::SendMessage(hWnd, WM_SYSCOMMAND, SC_MOVE | HTCAPTION, 0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(lParam);
    switch (message)
    {
    case WM_INITDIALOG:
        return (INT_PTR)TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        break;
    }
    return (INT_PTR)FALSE;
}


BOOL ImageFromIDResource(UINT nID, LPCTSTR sTR, Image * & pImg)
{
    HINSTANCE hInst = hInst;//GetResourceInstance();
    HRSRC hRsrc = ::FindResource (hInst,MAKEINTRESOURCE(nID),sTR); // type
    if (!hRsrc)
        return FALSE;
    // load resource into memory
    DWORD len = SizeofResource(hInst, hRsrc);
    BYTE* lpRsrc = (BYTE*)LoadResource(hInst, hRsrc);
    if (!lpRsrc)
        return FALSE;
    // Allocate global memory on which to create stream
    HGLOBAL m_hMem = GlobalAlloc(GMEM_FIXED, len);
    BYTE* pmem = (BYTE*)GlobalLock(m_hMem);
    memcpy(pmem,lpRsrc,len);
    IStream* pstm;
    CreateStreamOnHGlobal(m_hMem,FALSE,&pstm);
    // load from stream
    pImg=Gdiplus::Image::FromStream(pstm);
    // free/release stuff
    GlobalUnlock(m_hMem);
    pstm->Release();
    FreeResource(lpRsrc);
    return TRUE;
}


void Update()
{
    HDC hdcTemp= ::GetDC(g_hWnd);
    HDC hdcMemory=CreateCompatibleDC(hdcTemp);
    HBITMAP hBitMap=CreateCompatibleBitmap(hdcTemp, g_BakWidth, g_BakHeight);
    SelectObject(hdcMemory, hBitMap);

    HDC hdcScreen=::GetDC (g_hWnd);
    RECT rct;
    ::GetWindowRect(g_hWnd, &rct);
    POINT ptWinPos={rct.left,rct.top};
    Graphics graph(hdcMemory);

    Point points[] = { Point(0, 0),
        Point(g_BakWidth, 0),
        Point(0, g_BakHeight)
    };

    graph.DrawImage(g_pImageBack, points, 3);

    POINT ptDst;
    ptDst.x = rct.left;
    ptDst.y = rct.top;
    SIZE size={g_BakWidth, g_BakHeight};

    POINT pt;
    pt.x = 0;
    pt.y = 0;

    //设置成层次窗口
    DWORD dwExStyle = GetWindowLong(g_hWnd,GWL_EXSTYLE);
    if((dwExStyle & WS_EX_LAYERED) != WS_EX_LAYERED)
    {//WS_EX_LAYERED是0x00080000
        SetWindowLong(g_hWnd, GWL_EXSTYLE,dwExStyle^WS_EX_LAYERED);
    }

    //更新窗口
    if (!UpdateLayeredWindow( g_hWnd, hdcScreen, &ptWinPos,
        &size, hdcMemory, &pt, 0, &g_Blend, 2))
    {
        DWORD dwError = ::GetLastError();
        printf("failed");
    }
    //释放资源
    graph.ReleaseHDC(hdcMemory);
    ::DeleteObject(hBitMap);
    ::DeleteDC(hdcMemory);;
    ::ReleaseDC(g_hWnd, hdcTemp);
    ::ReleaseDC(g_hWnd, hdcScreen);
}