Convert String to Image

Question

Convert a string to an Image

Solution

bool ConvertCharToBitmap(TCHAR* szFileName, TCHAR* szStr, int iWidth, int iHeight, int iFontSize)

{

HDC hDC = GetDC(hWnd);

HDC hMemDC = CreateCompatibleDC(hDC);

SetTextColor(hMemDC, RGB(0, 255, 255));

SetBkMode(hMemDC, TRANSPARENT);

HBITMAP hBitmap = CreateCompatibleBitmap(hDC, iWidth, iHeight);

HBITMAP hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);

HFONT hFont = CreateFont(300, 0, 0, 0, FW_DONTCARE, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_OUTLINE_PRECIS,

CLIP_DEFAULT_PRECIS, CLEARTYPE_QUALITY, VARIABLE_PITCH, TEXT("Impact"));

HFONT hOldFont = (HFONT)SelectObject(hMemDC, hFont);

HBRUSH hBrush = CreateSolidBrush(RGB(255, 255, 0));

HBRUSH hOldBrush = (HBRUSH)SelectObject(hMemDC, hBrush);

RECT rc = { 0, 0, iWidth, iHeight };

FillRect(hMemDC, &rc, hBrush);

DrawText(hMemDC, szStr, -1, &rc, DT_CENTER | DT_SINGLELINE | DT_VCENTER);

TextOut(hMemDC, 0, 0, szStr, -1);

BITMAP bmp;

GetObject(hBitmap, sizeof(BITMAP), &bmp);

BITMAPFILEHEADER bmfHeader;

BITMAPINFOHEADER bi;

bi.biSize = sizeof(BITMAPINFOHEADER);

bi.biWidth = bmp.bmWidth;

bi.biHeight = bmp.bmHeight;

bi.biPlanes = 1;

bi.biBitCount = 32;

bi.biCompression = BI_RGB;

bi.biSizeImage = 0;

bi.biXPelsPerMeter = 0;

bi.biYPelsPerMeter = 0;

bi.biClrUsed = 0;

bi.biClrImportant = 0;

DWORD dwBmpSize = ((bmp.bmWidth * bi.biBitCount + 31) / 32) * 4 * bmp.bmHeight;

HANDLE hDIB = GlobalAlloc(GHND, dwBmpSize);

char *lpBitmap = (char *)GlobalLock(hDIB);

// Gets the "bits" from the bitmap and copies them into a buffer

// which is pointed to by lpbitmap.

GetDIBits(hMemDC, hBitmap, 0,

(UINT)bmp.bmHeight,

lpBitmap,

(BITMAPINFO *)&bi, DIB_RGB_COLORS);

// A file is created, this is where we will save the screen capture.

HANDLE hFile = CreateFile(szFileName,

GENERIC_WRITE,

0,

NULL,

CREATE_ALWAYS,

FILE_ATTRIBUTE_NORMAL, NULL);

// Add the size of the headers to the size of the bitmap to get the total file size

DWORD dwSizeofDIB = dwBmpSize + sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);

//Offset to where the actual bitmap bits start.

bmfHeader.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER);

//Size of the file

bmfHeader.bfSize = dwSizeofDIB;

//bfType must always be BM for Bitmaps

bmfHeader.bfType = 0x4D42; //BM

DWORD dwBytesWritten = 0;

WriteFile(hFile, (LPSTR)&bmfHeader, sizeof(BITMAPFILEHEADER), &dwBytesWritten, NULL);

WriteFile(hFile, (LPSTR)&bi, sizeof(BITMAPINFOHEADER), &dwBytesWritten, NULL);

WriteFile(hFile, (LPSTR)lpBitmap, dwBmpSize, &dwBytesWritten, NULL);

//Unlock and Free the DIB from the heap

GlobalUnlock(hDIB);

GlobalFree(hDIB);

//Close the handle for the file that was created

CloseHandle(hFile);

//SelectObject(hMemDC, hOldBrush);

SelectObject(hDC, hOldFont);

SelectObject(hDC, hOldBitmap);

//DeleteObject(hBrush);

DeleteObject(hFont);

DeleteObject(hBitmap);

DeleteDC(hMemDC);

ReleaseDC(NULL, hDC);

return true;

}

Output