subject_29507.htm

vc

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序号：29507 发表者：芝麻不开门 发表日期：2003-02-09 02:04:23
<br>主题：DirectX编程一问。
<br>内容：HPEN hpen, hpenOld;<BR>hpen = CreatePen(PS_SOLID, 1, RGB(255,255,255));<BR>hpenOld = SelectObject(hdc, hpen);<BR><BR>最后一句编译时出错。<BR>提示为：error C2440: '=' : cannot convert from 'void *' to 'struct HPEN__ *'<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Conversion from 'void*' to pointer to non-'void' requires an explicit cast<BR><BR><BR>大虾救命！<BR>
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<font color=red>答案被接受</font><br>回复者：songxinye 回复日期：2003-02-09 06:55:51
<br>内容：hpenOld = （HPEN ）SelectObject(hdc, hpen);<BR><BR>
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回复者：吴澄埃 回复日期：2003-02-09 09:38:19
<br>内容：我认为是这样:<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp; //定义变量.<BR>&nbsp;&nbsp; CPen *pNewPen;<BR>&nbsp;&nbsp; CPen *pOldPen;<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp; //构造新笔.<BR>&nbsp;&nbsp; pNewPen = new CPen;<BR>&nbsp;&nbsp; pNewPen-&gt;CreatPen(PS_SOLID,1,RGB(255,255,255));<BR><BR>&nbsp;&nbsp; pOldPen = pDC-&gt;SelectObject(pNewPen);<BR>&nbsp;&nbsp;&nbsp;&nbsp;//用新创建的笔绘图.&nbsp;&nbsp; <BR>&nbsp;&nbsp; pDC-&gt;MoveTo(200,60);<BR>&nbsp;&nbsp; pDC-&gt;LineTo(40,40);<BR><BR>&nbsp;&nbsp; pDC-&gt;SelectObject(pOldPen); //恢复设备描述表中的原有的笔.<BR><BR>应该是这样啦。<BR>
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回复者：tjhe 回复日期：2003-02-09 11:01:45
<br>内容：songxinye应该是正确的，DirectX一般不用MFC
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