求问如何获取文字的位图图像

Question

如题，想要把文字加到一个图片中去，应该从何着手？有api可用么？

Answer 1

在内存DC中创建位图，将位图选入内存DC中，然后，用内存DC进行绘制字体，这样，你绘制的内容都在位图上了，只要将位图保存到文件中就可以了 .

Answer 2

HWND hDispHwnd = GetDlgItem(IDC_STATIC_BMP)->GetSafeHwnd(); HDC dc = ::GetDC(hDispHwnd); HDC dcMem; dcMem = ::CreateCompatibleDC(dc); HBITMAP hBitmap = ::CreateCompatibleBitmap(dc, 128, 128); HBITMAP hOldBm = (HBITMAP)::SelectObject(dcMem, hBitmap); LOGBRUSH logbr; memset(&logbr, 0, sizeof(LOGBRUSH)); logbr.lbColor = RGB(255,0,0); logbr.lbStyle = BS_SOLID; HBRUSH hBrush = CreateBrushIndirect(&logbr); HBRUSH oldbr = (HBRUSH)SelectObject(dcMem, hBrush); RECT rt = {0, 0, 128, 128}; FillRect(dcMem, &rt, hBrush); LOGFONT logFont; memset(&logFont, 0, sizeof(LOGFONT)); logFont.lfHeight = 20;  lstrcpy(logFont.lfFaceName, _T("Arial")); HFONT hFont = CreateFontIndirect(&logFont); HFONT oldFont = (HFONT)SelectObject(dcMem, hFont); SetBkMode(dcMem, TRANSPARENT); SetTextColor(dcMem, RGB(255,255,255)); SIZE size; GetTextExtentPoint32(dcMem, _T("Hello"), 5, &size); TextOut(dcMem, (128 - size.cx)/2, (128 - size.cy)/2, _T("Hello"), 5); BitBlt(dc, 0, 0, 128, 128, dcMem, 0, 0, SRCCOPY); SelectObject(dcMem, hOldBm); SelectObject(dcMem, oldFont); SelectObject(dcMem, oldbr); ::DeleteDC(dcMem); SaveBmp(hBitmap, "E:\\Temp.bmp"); DeleteObject(hBitmap); DeleteObject(hFont); DeleteObject(hBrush); ::ReleaseDC( hDispHwnd , dc);

Answer 3

BOOL SaveBmp(HBITMAP hBitmap, CString FileName){ HDC hDC; int iBits; WORD wBitCount; DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0;  BITMAP Bitmap;   BITMAPFILEHEADER bmfHdr;   BITMAPINFOHEADER bi;   LPBITMAPINFOHEADER lpbi;   HANDLE fh, hDib, hPal,hOldPal=NULL;  hDC = CreateDC("DISPLAY", NULL, NULL, NULL); iBits = GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES);  DeleteDC(hDC);  if (iBits <= 1) wBitCount = 1;  else if (iBits <= 4)  wBitCount = 4;  else if (iBits <= 8)  wBitCount = 8;  else   wBitCount = 24;  GetObject(hBitmap, sizeof(Bitmap), (LPSTR)&Bitmap); bi.biSize = sizeof(BITMAPINFOHEADER); bi.biWidth = Bitmap.bmWidth; bi.biHeight = Bitmap.bmHeight; bi.biPlanes = 1; bi.biBitCount = wBitCount; bi.biCompression = BI_RGB; bi.biSizeImage = 0; bi.biXPelsPerMeter = 0; bi.biYPelsPerMeter = 0; bi.biClrImportant = 0; bi.biClrUsed = 0; dwBmBitsSize = ((Bitmap.bmWidth * wBitCount + 31) / 32) * 4 * Bitmap.bmHeight; hDib = GlobalAlloc(GHND,dwBmBitsSize + dwPaletteSize + sizeof(BITMAPINFOHEADER));  lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);  *lpbi = bi;  hPal = GetStockObject(DEFAULT_PALETTE);  if (hPal)  {  hDC = ::GetDC(NULL);  hOldPal = ::SelectPalette(hDC, (HPALETTE)hPal, FALSE);  RealizePalette(hDC);  } GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight, (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)  +dwPaletteSize, (BITMAPINFO *)lpbi, DIB_RGB_COLORS);  if (hOldPal)  {  ::SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);  RealizePalette(hDC);  ::ReleaseDC(NULL, hDC);  }  fh = CreateFile(FileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,  FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);  if (fh == INVALID_HANDLE_VALUE)  return FALSE;  bmfHdr.bfType = 0x4D42; // "BM"  dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;   bmfHdr.bfSize = dwDIBSize;  bmfHdr.bfReserved1 = 0;  bmfHdr.bfReserved2 = 0;  bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + (DWORD)sizeof(BITMAPINFOHEADER) + dwPaletteSize;  WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);  WriteFile(fh, (LPSTR)lpbi, dwDIBSize, &dwWritten, NULL);  GlobalUnlock(hDib);  GlobalFree(hDib);  CloseHandle(fh);  return TRUE; }