Win32中GDI+应用（四）--- 位图的打开与显示

显示位图，你应该使用GDI+里面的Bitmap类或者Image类，这两个类都提供了方法从硬盘上的一个文件打开文件，创建相应的内存中的位图对象的工作。然后你可以使用Graphics类的DrawImage方法来绘制该位图。
下面的代码初始化GDI+，显示一个打开文件对话框并且创建Bitmap对象，显示位图：

	GdiplusStartupInput input;

	ULONG_PTR gdiPlusToken;

	if(GdiplusStartup(&gdiPlusToken,&input,NULL)!=Ok)

	{

		return -1;

	}



	char fileName[200];

	OPENFILENAME openStruct;

	memset(&openStruct,0,sizeof(OPENFILENAME));

	openStruct.lStructSize=sizeof(OPENFILENAME);

	openStruct.Flags=OFN_EXPLORER;

	openStruct.lpstrFilter="Jpeg files(*.jpg)\0*.jpg\0\0";

	openStruct.lpstrFile=fileName;

	openStruct.nMaxFile=200;

	if(GetOpenFileName(&openStruct))

	{

		imageFileName=fileName;

	}



	HDC hdc=GetDC(hPicWnd);

	if(hdc==NULL)

	{

		MessageBox(NULL,"","",MB_OK);

	}

	Graphics *g=new Graphics(hdc);

	WCHAR tmpFileName[100];

	size_t numOfChars;

	if(/*mbstowcs_s(&numOfChars,tmpFileName,100,fileName,199)*/MultiByteToWideChar(CP_ACP,MB_COMPOSITE,imageFileName.c_str(),200,tmpFileName,100)/*==-1*/)

	{

		MessageBox(NULL,"Error occured in string convertion!","Error!",MB_OK);       

		return wParam;

	}



	HWND hPicWnd；

		RECT rc;

	GetWindowRect(hPicWnd,&rc);



	RectF drawRect(rc.left,rc.top,rc.right-rc.left,rc.bottom-rc.top);

	Bitmap *bmp=new Bitmap(tmpFileName);

	bmpMain=bmp;

	g->DrawImage(bmp,drawRect);

	delete g;



	ReleaseDC(hwnd,hdc);



	GdiplusShutdown(gdiPlusToken);

转载地址:http://www.cppblog.com/dingding/archive/2008/06/27/54796.html