GDI窗口绘图求助
最近在开发一个小程序,需要在AUTOCAD主应用程序窗口用GDI绘图,代码如下,却无法显示出绘制的直线,不知道啥原因,望大神们帮看看:
private void button1_Click(object sender, EventArgs e)
{
AcadApplication acadApp = AcadApp.AcadApplication as AcadApplication;
IntPtr AcadHwnd = (IntPtr)acadApp.HWND;//获取AutoCAD应用程序的窗口句柄
Graphics vGraphics = Graphics.FromHwnd(AcadHwnd);
vGraphics.DrawLine(Pens.Red, 0, 0, 100, 100);
}