C++：本地图片拷贝到剪切板

我不是女神ヾ 2024-04-20 12:22 58阅读 0赞

##### 1、本地图片转换为HBITMAP #####

HBITMAP CNoteWindow::CopySelectRectBitmap(LPCTSTR lpszPath)
    {
    	HBITMAP hBitmap = NULL;
    	//背景色设置为白色。
    	Color backColor = Color(255,255,255,255);
    	//Status sts
    	if (PathFileExists(lpszPath))
    	{
    		Bitmap* pBitmap = Bitmap::FromFile(lpszPath);
    		Status sts = pBitmap->GetLastStatus();
    		sts = pBitmap->GetHBITMAP(backColor, &hBitmap);
    		if (sts == Ok)
    		{
    			int k = 0;
    		}
    	}
    
    	int error = GetLastError();
    	return hBitmap;
    }

##### 2、HBITMAP 拷贝到剪切板 #####

bool CNoteWindow::BitmapToClipboard(HBITMAP hBM, HWND hWnd)
    {
    	if (!::OpenClipboard(hWnd))
    		return false;
    	::EmptyClipboard();
    
    	BITMAP bm;
    	::GetObject(hBM, sizeof(bm), &bm);
    
    	BITMAPINFOHEADER bi;
    	::ZeroMemory(&bi, sizeof(BITMAPINFOHEADER));
    	bi.biSize = sizeof(BITMAPINFOHEADER);
    	bi.biWidth = bm.bmWidth;
    	bi.biHeight = bm.bmHeight;
    	bi.biPlanes = 1;
    	bi.biBitCount = bm.bmBitsPixel;
    	bi.biCompression = BI_RGB;
    	if (bi.biBitCount <= 1)	// make sure bits per pixel is valid
    		bi.biBitCount = 1;
    	else if (bi.biBitCount <= 4)
    		bi.biBitCount = 4;
    	else if (bi.biBitCount <= 8)
    		bi.biBitCount = 8;
    	else // if greater than 8-bit, force to 24-bit
    		bi.biBitCount = 24;
    
    	// Get size of color table.
    	SIZE_T dwColTableLen = (bi.biBitCount <= 8) ? (1 << bi.biBitCount) * sizeof(RGBQUAD) : 0;
    
    	// Create a device context with palette
    	HDC hDC = ::GetDC(NULL);
    	HPALETTE hPal = static_cast<HPALETTE>(::GetStockObject(DEFAULT_PALETTE));
    	HPALETTE hOldPal = ::SelectPalette(hDC, hPal, FALSE);
    	::RealizePalette(hDC);
    
    	// Use GetDIBits to calculate the image size.
    	::GetDIBits(hDC, hBM, 0, static_cast<UINT>(bi.biHeight), NULL,
    		reinterpret_cast<LPBITMAPINFO>(&bi), DIB_RGB_COLORS);
    	// If the driver did not fill in the biSizeImage field, then compute it.
    	// Each scan line of the image is aligned on a DWORD (32bit) boundary.
    	if (0 == bi.biSizeImage)
    		bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8) * bi.biHeight;
    
    	// Allocate memory
    	HGLOBAL hDIB = ::GlobalAlloc(GMEM_MOVEABLE, sizeof(BITMAPINFOHEADER) + dwColTableLen + bi.biSizeImage);
    	if (hDIB)
    	{
    		union tagHdr_u
    		{
    			LPVOID             p;
    			LPBYTE             pByte;
    			LPBITMAPINFOHEADER pHdr;
    			LPBITMAPINFO       pInfo;
    		} Hdr;
    
    		Hdr.p = ::GlobalLock(hDIB);
    		// Copy the header
    		::CopyMemory(Hdr.p, &bi, sizeof(BITMAPINFOHEADER));
    		// Convert/copy the image bits and create the color table
    		int nConv = ::GetDIBits(hDC, hBM, 0, static_cast<UINT>(bi.biHeight),
    			Hdr.pByte + sizeof(BITMAPINFOHEADER) + dwColTableLen,
    			Hdr.pInfo, DIB_RGB_COLORS);
    		::GlobalUnlock(hDIB);
    		if (!nConv)
    		{
    			::GlobalFree(hDIB);
    			hDIB = NULL;
    		}
    	}
    	if (hDIB)
    		::SetClipboardData(CF_DIB, hDIB);
    	::CloseClipboard();
    	::SelectPalette(hDC, hOldPal, FALSE);
    	::ReleaseDC(NULL, hDC);
    	return NULL != hDIB;
    }

参考：  
https://www.codeproject.com/Questions/344732/copy-hbitmap-to-clipboard%20%E5%9B%9E%E5%A4%8D%20%E8%B5%9E