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我需要打印的攝像頭車架上的時間戳,並試圖下一步:HBITMAP上沒有「可見」DC的DrawText?
CameraFrameBufferSize = WebCam->GetFrameSize();
CameraFrameBuffer = (unsigned char *)realloc(CameraFrameBuffer, CameraFrameBufferSize);
unsigned char * buf = WebCam->CaptureFrame(); // returns pointer to RGB buffer of frame
HDC hDC = CreateCompatibleDC(NULL);
HFONT font = CreateFont(20, 0, 0, 0, FW_BOLD, FALSE, FALSE, FALSE, RUSSIAN_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, PROOF_QUALITY, VARIABLE_PITCH, "times");
RECT rect;
rect.left = 0;
rect.right = WebCam->GetFrameWidth();
rect.top = 10;
rect.bottom = 50;
HBITMAP hBitmap = CreateHBITMAPfromByteArray(hDC, WebCam->GetFrameWidth(), WebCam->GetFrameHeight(), 3, buf);
SelectObject(hDC, hBitmap);
SelectObject(hDC, font);
SetBkMode(hDC, TRANSPARENT);
SetTextColor(hDC, RGB(255,255,255));
string Text = GetTime("%Y.%m.%d %H:%M:%S");
DrawTextA(hDC, Text.c_str(), Text.size(), &rect, DT_CENTER | DT_WORDBREAK);
jpge::compress_image_to_jpeg_file_in_memory(CameraFrameBuffer, CameraFrameBufferSize, WebCam->GetFrameWidth() ,WebCam->GetFrameHeight(), 3, buf, CameraCompressor);
CameraFrame = string(reinterpret_cast<char*>(CameraFrameBuffer), CameraFrameBufferSize);
ReleaseDC(NULL, hDC);
DeleteObject(hBitmap);
DeleteObject(font);
CreateHBITMAPfromByteArray是:
HBITMAP CreateHBITMAPfromByteArray(HDC hdc, int Width, int Height, int Colors, unsigned char* pImageData){
LPBITMAPINFO lpbi = new BITMAPINFO;
lpbi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
lpbi->bmiHeader.biWidth = Width;
lpbi->bmiHeader.biHeight = -Height;
lpbi->bmiHeader.biPlanes = 1;
lpbi->bmiHeader.biBitCount = Colors*8;
lpbi->bmiHeader.biCompression = BI_RGB;
lpbi->bmiHeader.biSizeImage = 0;
lpbi->bmiHeader.biXPelsPerMeter = 0;
lpbi->bmiHeader.biYPelsPerMeter = 0;
lpbi->bmiHeader.biClrUsed = 0;
lpbi->bmiHeader.biClrImportant = 0;
return CreateDIBSection(hdc, lpbi, DIB_RGB_COLORS,(void **)&pImageData,NULL,0);
}
並保存測試圖像文件時,我想起來了沒有文字框(string CameraFrame)...
相機在後臺拍攝並且屏幕上沒有顯示任何內容,所以我不確定我正在選擇HDC。
一般來說,我有一個圖像的RGB緩衝區,其中必須放置具有透明度的文本。如何實現?
是的,我用錯了'CreateDIBSection'。謝謝。 – Iceman