初始化GDI+库进行图形图像处理

在程序中使用GDI+的步骤为：

1，  添加库头文件，在include path中加入“C:\\Program Files\\Microsoft SDKs\\Windows\\v7.0A\\include\\”，具体要根据SDK的安装路径来定，也可以在代码中直接#include 引用。

2，  添加Lib库，直接引用#pragma comment(lib,"C:\\Program Files\\Microsoft SDKs\\Windows\\v7.0A\\Lib\\GDIplus.lib")

3，  使用GDI+命名空间using namespace Gdiplus；

4，  GDI资源初始与销毁。在使用GDI+资源之间，应该通过GdiplusStartup函数进行GDI+系统资源的初始化，在程序结束前，调用GdiplusShutdown函数进行GDI+资源的销毁。在App类的InitInstance和ExitInstance或析购函数中分别调用。

code 示例如下：

CGDI_Plus_LearningApp theApp;
ULONG_PTR gdiplusToken; //定义全局变量，表明对GDI+的一个引用

/////////////////////////////////////////////////////////////////////////////
// CGDI_Plus_LearningApp initialization

BOOL CGDI_Plus_LearningApp::InitInstance()
{
 AfxEnableControlContainer();

 // Standard initialization
 // If you are not using these features and wish to reduce the size
 //  of your final executable, you should remove from the following
 //  the specific initialization routines you do not need.

#ifdef _AFXDLL
 Enable3dControls();   // Call this when using MFC in a shared DLL
#else
 Enable3dControlsStatic(); // Call this when linking to MFC statically
#endif

 // Change the registry key under which our settings are stored.
 // TODO: You should modify this string to be something appropriate
 // such as the name of your company or organization.
 SetRegistryKey(_T("Local AppWizard-Generated Applications"));

 // To create the main window, this code creates a new frame window
 // object and then sets it as the application's main window object.
 Gdiplus::GdiplusStartupInput gdiplusStartupInput;
 Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
 CMainFrame* pFrame = new CMainFrame;
 m_pMainWnd = pFrame;

 // create and load the frame with its resources

 pFrame->LoadFrame(IDR_MAINFRAME,
  WS_OVERLAPPEDWINDOW | FWS_ADDTOTITLE, NULL,
  NULL);

 // The one and only window has been initialized, so show and update it.
 pFrame->ShowWindow(SW_SHOW);
 pFrame->UpdateWindow();

 return TRUE;
}

int CGDI_Plus_LearningApp::ExitInstance()
{
 // TODO: Add your specialized code here and/or call the base class
 Gdiplus::GdiplusShutdown(gdiplusToken); //也可以在析构函数中调用此函数
 return CWinApp::ExitInstance();
}