在非托管C++中使用GDI+

        微軟說(shuō)，GDI+可以在所有基于Windows的應用程序中使用，包括64位的Windows版本(不包括Win3.X)。你只需要把GDIPlus.dll拷入Windows的系統目錄，即可使用需要GDI+支持的應用程序。在非托管的C++中使用，你只需要包含GDIplus.h頭文件，然后在連接設置包含GdiPlus.lib庫文件即可。

        好了，讓我們用最簡(jiǎn)單的任務(wù)——畫(huà)線(xiàn)和寫(xiě)字來(lái)看看怎樣在C++中使用它吧。

一、畫(huà)線(xiàn)

       用GDI+畫(huà)線(xiàn)，你需要這些對象：Graphics，Pen，Color。Graphics提供了Graphics::DrawLine方法，Pen保存了線(xiàn)的屬性，比如顏色，寬度等。把Pen對象的地址作為Graphics::DrawLine方法的參數。
   
        還是看看這個(gè)簡(jiǎn)單的SDK程序吧。我們需要注意的是，在WinMain函數中，我們需要調用GdiplusStartup和GdiplusShutdown。

#define UNICODE#include <windows.h>#include <gdiplus.h>using namespace Gdiplus;void OnPaint(HDC hdc){   Graphics graphics(hdc);   Pen      pen(Color(255, 0, 0, 255));   graphics.DrawLine(&pen, 0, 0, 200, 100);}LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, PSTR, INT iCmdShow){   HWND                hWnd;   MSG                 msg;   WNDCLASS            wndClass;   GdiplusStartupInput gdiplusStartupInput;   ULONG_PTR           gdiplusToken;      // Initialize GDI+.   GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);      wndClass.style          = CS_HREDRAW | CS_VREDRAW;   wndClass.lpfnWndProc    = WndProc;   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  = TEXT("GettingStarted");      RegisterClass(&wndClass);      hWnd = CreateWindow(      TEXT("GettingStarted"),   // window class name      TEXT("Getting Started"),  // window caption      WS_OVERLAPPEDWINDOW,      // window style      CW_USEDEFAULT,            // initial x position      CW_USEDEFAULT,            // initial y position      CW_USEDEFAULT,            // initial x size      CW_USEDEFAULT,            // initial y size      NULL,                     // parent window handle      NULL,                     // window menu handle      hInstance,                // program instance handle      NULL);                    // creation parameters	     ShowWindow(hWnd, iCmdShow);   UpdateWindow(hWnd);      while(GetMessage(&msg, NULL, 0, 0))   {      TranslateMessage(&msg);      DispatchMessage(&msg);   }      GdiplusShutdown(gdiplusToken);   return msg.wParam;}  // WinMainLRESULT CALLBACK WndProc(HWND hWnd, UINT message,    WPARAM wParam, LPARAM lParam){   HDC          hdc;   PAINTSTRUCT  ps;      switch(message)   {   case WM_PAINT:      hdc = BeginPaint(hWnd, &ps);      OnPaint(hdc);      EndPaint(hWnd, &ps);      return 0;   case WM_DESTROY:      PostQuitMessage(0);      return 0;   default:      return DefWindowProc(hWnd, message, wParam, lParam);   }} // WndProc

void OnPaint(HDC hdc){   Graphics    graphics(hdc);   SolidBrush  brush(Color(255, 0, 0, 255));   FontFamily  fontFamily(L"宋體");   Font        font(&fontFamily, 24, FontStyleRegular, UnitPixel);   PointF      pointF(10.0f, 20.0f);      graphics.DrawString(L"你好!GDI+", -1, &font, pointF, &brush);}