在bmp上添加字符2 分类： VC++ 2013-09-10 08:30 588人阅读 评论(0) 收藏

void CTextOnbmpDlg::OnButton2()
{
 // TODO: Add your control notification handler code here
 FILE *fp=fopen("d:\\temp\\pic16001200\\000.bmp", "rb");
  if(fp == 0)
       return ;
  HDC hDC = ::GetDC(GetSafeHwnd());
     HDC hMemDC = CreateCompatibleDC(hDC);
  fseek(fp, sizeof(BITMAPFILEHEADER), 0);
  BITMAPINFOHEADER head;
  fread(&head, sizeof(BITMAPINFOHEADER), 1, fp);
  int bmpHeight = head.biHeight;
  int bmpWidth = head.biWidth;
  int biBitCount = head.biBitCount;
  int lineByte = (bmpWidth*biBitCount/8+3)/4*4;
  RGBQUAD *pColorTable;
  if(biBitCount == 8)
   {
       pColorTable = new RGBQUAD[256];
       fread(pColorTable, sizeof(RGBQUAD), 256, fp);
   }
  unsigned char *pBmpBuf = new unsigned char[lineByte*bmpHeight];
  fread(pBmpBuf, 1, lineByte*bmpHeight, fp);
  
   CDC *m_pMemDC;
  m_pMemDC = new CDC();
  CDC *pDC;
  pDC = GetDC();
  m_pMemDC->CreateCompatibleDC(pDC);
  CBitmap *m_pOldBmp = NULL;
  CBitmap *m_pMemBmp = new CBitmap();       //根据图片的大小创建一个兼容位图
  m_pMemBmp->CreateCompatibleBitmap(pDC, bmpWidth, bmpHeight);
  m_pOldBmp = m_pMemDC->SelectObject(m_pMemBmp);
  
   // 把图像的数据绘制到兼容位图上
   
   SetDIBits(m_pMemDC->GetSafeHdc(), (HBITMAP)m_pMemBmp->m_hObject,
       0, bmpHeight, (LPVOID)pBmpBuf, (BITMAPINFO*)&head, DIB_RGB_COLORS);
  m_pMemDC->SetBkMode(TRANSPARENT);
  m_pMemDC->SetTextColor(RGB(255, 0, 0));
 
   //设置字体
   CFont font;
  font.CreateFont(10,10,0,0,10,FALSE,FALSE,FALSE,ANSI_CHARSET,OUT_DEFAULT_PRECIS,OUT_DEFAULT_PRECIS,DEFAULT_QUALITY,FF_SWISS,"宋体");
  SelectObject(hMemDC, font);
  // 添加文字到指定位置
   m_pMemDC->TextOut(100, 100, "hello");
  
   unsigned char *pTemp = new unsigned char[lineByte*bmpHeight];
  GetDIBits(m_pMemDC->GetSafeHdc(), (HBITMAP)m_pMemBmp->m_hObject, 0, bmpHeight,
       (LPVOID)pTemp, (BITMAPINFO*)&head, DIB_RGB_COLORS);
  fclose(fp);
  
   char bmpwrite[] = "test2.bmp";
  fp = fopen(bmpwrite,"wb");
  BITMAPFILEHEADER fileHead;
  fileHead.bfType = 0x4D42;
  fileHead.bfSize = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+lineByte*bmpHeight;
  fileHead.bfReserved1 = 0;
  fileHead.bfReserved2 = 0;
  fileHead.bfOffBits = 54;
  fwrite(&fileHead, sizeof(BITMAPFILEHEADER), 1, fp);
  
   fwrite(&head, sizeof(BITMAPINFOHEADER), 1, fp);
  fwrite(pTemp, lineByte*bmpHeight, 1, fp);
  fclose(fp);
  
   delete m_pMemBmp;
  delete m_pMemDC;
  delete[] pBmpBuf;
 delete[] pTemp;
 MessageBox("VOER!");
}

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