GdiPlus笔记

GdiPlus笔记

废话

用过不知多少开源图像库，其实似乎无例外的都是几个图像解码库zlib、libpng、libjpeg的封装。够了，基本可以解决所有图像问题。GdiPlus这种要死不活的东西，拜微软所赐，偶今天才有空去瞅瞅。玩一下吧，不想为了写几行代码去整个开源的解码库。别了，zlib；别了，libpng；别了，skia；别了，freeimage；别了，cximage；别了，devil。别了，opensource。

source

MSDN About GDI+
http://msdn.microsoft.com/en-us/library/ms533797(v=VS.85).aspx

Getting Started
http://msdn.microsoft.com/en-us/library/ms533807(v=VS.85).aspx

Image Class
http://msdn.microsoft.com/en-us/library/ms534462

Use

Note the call to GdiplusStartup in the WinMain function. The first parameter of the GdiplusStartup function is the address of a ULONG_PTR. GdiplusStartup fills that variable with a token that is later passed to the GdiplusShutdown function. The second parameter of the GdiplusStartup function is the address of a GdiplusStartupInput structure. The preceding code relies on the default GdiplusStartupInput constructor to set the structure members appropriately.

1.引用
#include <gdiplus.h>
using namespace Gdiplus;
#pragma comment (lib,"Gdiplus.lib")

2.初始化与销毁

GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR           gdiplusToken;
// Initialize GDI+.
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);// Shutdown
GdiplusShutdown(gdiplusToken);

3.画

VOID OnPaint(HDC hdc)
{
   Graphics graphics(hdc);
   Pen      pen(Color(255, 0, 0, 255));
   graphics.DrawLine(&pen, 0, 0, 200, 100);
}