学步园

本文主要用于再WinCE当中处理不规则窗体的时候用到的。

异形窗体大家相比也是很清楚，主要就是利用Region，Windows里面有很多的API，虽然他的弊端很明显，例如，速度慢，这里主要就是为了解决这个问题，提供如下的函数接口，这里写成了DLL，给大家调用使用：

///Region 相关处理函数<br /> ///"Author"=Rocky<br /> ///DateTime:2010/04/13<br /> ///Function Name :SetUpRegion<br /> ///Description:根据hbmp和_transColor来生成_hrgn<br /> ///HRGN & _hrgn :保存生成的结果的引用<br /> ///HBITMAP _hbmp :带有关键色的位图<br /> ///COLORREF _transColor:关键色，如果没有则取GetPixel(0,0)<br /> ROCKRGN_API void SetupRegion(HRGN &_hrgn, HBITMAP _hbmp, COLORREF _transColor)<br /> {<br /> if(_hbmp==NULL)<br /> return ;</p> <p> BITMAP bitmap;<br /> GetObject(_hbmp,sizeof(bitmap),&bitmap);<br /> //获取位图的高和宽<br /> int nWidth=bitmap.bmWidth;<br /> int nHeight=bitmap.bmHeight;<br /> HDC hmemDC= ::CreateCompatibleDC(NULL);<br /> //创建与传入DC兼容的临时<br /> HBITMAP hOldBmp = (HBITMAP)::SelectObject(hmemDC,_hbmp);</p> <p> //创建总的窗体区域，初始region为0<br /> if(_hrgn==NULL)<br /> _hrgn =::CreateRectRgn(0,0,0,0);</p> <p> if(_transColor==NULL)<br /> _transColor=GetPixel(hmemDC,0,0);</p> <p> int y;<br /> for(y=0;y<nHeight ;y++)<br /> {<br /> HRGN rgnTemp; //保存临时region<br /> int iX = 0;<br /> do<br /> {<br /> //跳过透明色找到下一个非透明色的点.<br /> while (iX < nWidth && ::GetPixel(hmemDC,iX, y) == _transColor)<br /> iX++;<br /> //记住这个起始点<br /> int iLeftX = iX;<br /> //寻找下个透明色的点<br /> while (iX < nWidth && ::GetPixel(hmemDC,iX, y) != _transColor)<br /> ++iX;<br /> //创建一个包含起点与重点间高为1像素的临时“region”<br /> rgnTemp=::CreateRectRgn(iLeftX, y, iX, y+1);</p> <p> //合并到主"region".<br /> CombineRgn( _hrgn,_hrgn,rgnTemp, RGN_OR);</p> <p> //删除临时"region",否则下次创建时和出错<br /> ::DeleteObject(rgnTemp);<br /> }<br /> while(iX <nWidth );<br /> iX = 0;<br /> }<br /> ::SelectObject(hmemDC,hOldBmp);<br /> ::DeleteDC(hmemDC);<br /> //return hrgn;<br /> }<br /> ///FunctionName:SaveRGN<br /> ///Description:保存HRGN到指定的文件<br /> ///HRGN hRgn:需要保存的区域<br /> ///pFilePath:保存文件的路径<br /> ROCKRGN_API void SaveRGN(HRGN hRgn,TCHAR *pFilePath)<br /> {<br /> //获取hRgn的大小<br /> DWORD size=0;<br /> size = GetRegionData(hRgn,size,NULL);</p> <p> BYTE *pRegionData=new BYTE[size];<br /> if(0==GetRegionData(hRgn,size,(LPRGNDATA)pRegionData))<br /> {<br /> return;<br /> }<br /> HANDLE hFile = CreateFile(pFilePath,GENERIC_WRITE|GENERIC_READ,FILE_SHARE_READ,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);<br /> if(hFile==NULL)<br /> {<br /> return;<br /> }<br /> DWORD dwWrited=0;<br /> if(0==WriteFile(hFile,pRegionData,size,&dwWrited,NULL))<br /> {<br /> return;<br /> }<br /> CloseHandle(hFile);<br /> hFile=NULL;<br /> //删除<br /> delete pRegionData;<br /> pRegionData=NULL;<br /> }</p> <p>///FunctionName: ReadRGN<br /> ///读取RGN文件到内存当中<br /> ///HRGN &_hRgn:读取的文件存放的地方<br /> ///pFilePath:读取的文件内容<br /> ///<br /> ROCKRGN_API void ReadRGN(HRGN &_hRgn, TCHAR *pFilePath)<br /> {<br /> HANDLE hFile = CreateFile(pFilePath,GENERIC_WRITE|GENERIC_READ,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);<br /> if(hFile==NULL)<br /> {<br /> return ;<br /> }<br /> DWORD size=GetFileSize(hFile,NULL);<br /> if(size==0xFFFFFFFF)<br /> {<br /> return ;<br /> }</p> <p> BYTE *pRegionData= new BYTE[size];<br /> DWORD dwNumberWrite=0;</p> <p> ReadFile(hFile,pRegionData,size,&dwNumberWrite,NULL);</p> <p> _hRgn = ExtCreateRegion(NULL,size,(RGNDATA*)pRegionData);<br /> CloseHandle(hFile);<br /> hFile=NULL;<br /> delete pRegionData;<br /> pRegionData=NULL;<br /> }</p> <p>ROCKRGN_API void RockSetWindowRgn(HWND hWnd,HRGN hrgn,BOOL bRedraw)<br /> {<br /> SetWindowRgn(hWnd,hrgn,bRedraw);<br /> }