win32智能设备程序中文文字换行加折行的方法

写wince程序寻得的中文文字换行加折行的方法：

void loadTxtWordBreak(HDC hdc,RECT rect)//按行读取txt文件
{  
CString sAll, sLine;
CString sWholePath;
USHORT i;
HANDLE hFile;
DWORD NumberOfBytesRead;
BOOL bSuccess;


sWholePath = "\\hotMessage.txt";
sWholePath = dirFile;
hFile = CreateFile(sWholePath, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
DWORD filesize=GetFileSize(hFile,NULL); 
char* ReadBuffer=new char[filesize+1]; // 最后一位为 '/0',C-Style 字符串的结束符。
bSuccess = ReadFile(hFile, ReadBuffer, filesize, &NumberOfBytesRead, NULL);
ReadBuffer[NumberOfBytesRead] = '\0';
sAll = ReadBuffer;
sLine = "";
for (i = 0; i < sAll.GetLength(); i++)
{
  sLine += sAll.GetAt(i);
  if ((sAll.GetAt(i) == '\n') || (i == sAll.GetLength() - 1))
  {
   if (sLine.Right(2) == "\r\n")
   {
    sLine = sLine.Left(sLine.GetLength() - 2); //去掉 \r\n
   }
   if (sLine != "")
   {
    DrawTextEx(hdc,sLine, &rect);
   }
   sLine = "";
  }
}
// 善后工作 　　
delete[] ReadBuffer; // 注意是delete[] 而不是 delete 　　
CloseHandle(hFile); // 关闭句柄。 
}




int DrawTextEx(HDC hDC,CString sText, LPRECT lpRect)//读取每行并按宽度折行
{
        int nCount,nLine;
        CString sDraw,sLeft;


        sDraw.Empty();
        sLeft=sText;
        LPCTSTR lpString=sText;
        int nTolLength=sText.GetLength();
        UINT uFormat=DT_SINGLELINE | DT_CENTER;
        
        SIZE szStr;

        CString lpStr;                        
        int nWidth = lpRect->right - lpRect->left;        // Rect width
        nCount =1;
        nLine = 1;

        while(nTolLength>0)
        {
                //如果绘制的字字符串本身带有格式，有换行符。这里需将nCount置于1。要遍历每个字符是否为换行符
                //nCount=1;
                if(nCount>nTolLength)
                   nCount=nTolLength;

                lpStr=sLeft.Left(nCount);
                GetTextExtentPoint32(hDC, lpStr, nCount, &szStr);
                if(szStr.cx < nWidth)
                {
                        while(szStr.cx < nWidth && nCount <nTolLength)//判断字符长度是否超过输出面板最大宽度，如果没超过判断再加一个字是否超过
                        {                             
                                nCount++;
                                lpStr=sLeft.Left(nCount);
                                GetTextExtentPoint32(hDC, lpStr, nCount, &szStr);//该函数计算指定的正文字符串的高度和宽度
                        }



      if(szStr.cx > nWidth)
      {
                                nCount--;
                                nLine++;
      }

                }
    else
    {
                        while(szStr.cx > nWidth && nCount >1)
                        {
                                nCount--;
                                lpStr=sLeft.Left(nCount);

                                GetTextExtentPoint32(hDC, lpStr, nCount, &szStr);
                        }

                }
                sDraw+=sLeft.Left(nCount)+_T("\r\n");  //让sDraw等于前nCount个字并在结尾加上\r\n
                sLeft=sLeft.Right(sLeft.GetLength()-nCount); //让sLeft等于后面的字
                nTolLength-=nCount;
        }
  uFormat=/*DT_EDITCONTROL|DT_LEFT*/DT_CENTER;
  DrawText(hDC, sDraw, sDraw.GetLength(), lpRect, uFormat);
        return nLine;

}