switch case结构中绘线问题？

[jkmaple]

为什么在CASE标签后绘图不显示呢？
只要不在SWITCH-CASE中就能正常显示！

[ouyh12345]

代码？

[jkmaple]

WORD wCMD = static_cast<WORD>(*(hpgl_info.cmd.data ()+sizeof(char)));
BYTE cmd1[2] = {0,0};
cmd1[1] = static_cast<BYTE>(*(hpgl_info.cmd.data ()));
cmd1[0] = static_cast<BYTE>(*(hpgl_info.cmd.data ()+sizeof(char)));
::memcpy (&wCMD,cmd1,hpgl_info.cmd.size ());

switch(wCMD)
{
case PD:
hpgl_info.hpgl_display_DC->MoveTo (20,50);//放在switch外面正常
hpgl_info.hpgl_display_DC->LineTo (300,700);
break;
default:
CRect rect;
hpgl_info.hpgl_display_DC->GetWindow ()->GetClientRect (&rect);
hpgl_info.hpgl_display_DC->DrawText (_T("无效命令"),-1,&rect,DT_CENTER | DT_VCENTER | DT_SINGLELINE);
break;
}

[ouyh12345]

跟踪时，进了PD case吗？
先把default里的东西注释掉

[jkmaple]

进了，一切正常！

[chunyou128]

那就放外边吧