Question

TransparentBlt（）使用后对话框上不显示图片

void CMFCDlg::OnButton1()
{
// TODO: Add your control notification handler code here
CBitmap FootballBMP;
FootballBMP.LoadBitmap(IDB_FOOTBALLBMP);
CDC ImageDC;
CDC *pDC=GetDC();
ImageDC.CreateCompatibleDC(pDC);
CBitmap *pOldImageBMP = ImageDC.SelectObject(&FootballBMP);
TransparentBlt(pDC->m_hDC, 0, 0, 218, 199, ImageDC.m_hDC, 0, 0, 218, 199, RGB(0,0,0xff));
ImageDC.SelectObject(pOldImageBMP);
}

Answer 1

添加一个 Invalidate（）
因为刷新不及时

追问

还是不行,帮忙在你机器上调一下

追答

我测试可以
如果编译异常 在 "工程"->"设置"->在"Project Setting"中,"对象/库模块"中,增加Msimg32.lib.
获取手动导入

CBitmap FootballBMP;
FootballBMP.LoadBitmap(IDB_BMP_MM);
CDC ImageDC;
CDC *pDC=GetDC();
CClientDC dc(this);
ImageDC.CreateCompatibleDC(pDC);
CBitmap *pOldImageBMP = ImageDC.SelectObject(&FootballBMP);
TransparentBlt(/*dc.m_hDC*/ pDC->m_hDC, 0, 0, 218, 199, ImageDC.m_hDC, 0, 0, 218, 199, RGB(0,0,0xff));
ImageDC.SelectObject(pOldImageBMP);