Win32中GDI+应用(四)--- 位图的打开与显示
时间:2014-06-23 06:02:53
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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
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