MFC动态加载图片

notfindjob2025-11-09 15:16

【1】拖个控件Picture Control到对话框中

【2】为控件添加一个变量m_picControl

【3】加载图片

复制代码

HBITMAP hBitmap = (HBITMAP)LoadImageA(NULL, "Z:/testProj/res/bitmap2.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
m_picControl.SetBitmap(hBitmap);

【4】问题解决

此时发现无法显示图片，这是因为你没有加载图片的类型，默认是Frame

【5】调整图片大小

复制代码

HDC dc = GetDC()->m_hDC;
HBITMAP hBitmapNew;
TranslateBitmapSize(dc, hBitmap, 140, 140, hBitmapNew, 50, 50);

BOOL TranslateBitmapSize(
	IN HDC hCurScreemDC,	//当前屏幕DC，可通过GetDC获得
	IN HBITMAP hBmpSrc,	//原BITMAP句柄
	IN int nSrcWidth,		//原BITMAP的宽度
	IN int nSrcHeight,		//原BITMAP的高度
	OUT HBITMAP &hBmpDst,	//改变大小后的BITMAP的句柄
	IN int nDstWidth,		//改变大小后的BITMAP的宽度
	IN int nDstHeight		//改变大小后的BITMAP的高度
)
{
	if (hBmpSrc == NULL || hCurScreemDC == NULL)
	{
		return FALSE;
	}
	if (hBmpDst != NULL)
	{
		DeleteObject(hBmpDst);
	}
	HDC hOldSrcDC = NULL;
	HDC hOldDstDC = NULL;
	HDC hSrcDC = CreateCompatibleDC(hCurScreemDC);
	HDC hDstDC = CreateCompatibleDC(hCurScreemDC);
	hBmpDst = CreateCompatibleBitmap(hCurScreemDC, nDstWidth, nDstHeight);
	hOldSrcDC = (HDC)SelectObject(hSrcDC, hBmpSrc);
	hOldDstDC = (HDC)SelectObject(hDstDC, hBmpDst);
	StretchBlt(hDstDC, 0, 0, nDstWidth, nDstHeight, hSrcDC, 0, 0, nSrcWidth, nSrcHeight, SRCCOPY);
	SelectObject(hSrcDC, hOldSrcDC);
	SelectObject(hDstDC, hOldDstDC);
	DeleteObject(hSrcDC);
	DeleteObject(hDstDC);
	return TRUE;
}