MFC:更改 CEdit 的颜色
伙计们，谁能简要介绍一下如何在运行时更改 CEdit 控件的背景颜色?如果字段长度为零，我希望能够将背景更改为红色，否则为正常白色.
Guys, can someone give me a brief run through of how to change the background colour of a CEdit control at runtime? I want to be able to change the background to red if the field is zero length and the normal white otherwise.
推荐答案
你不能用一个普通的 CEdit 来完成，你需要覆盖一些位.
You cannot do it with a plain CEdit, you need to override a few bits.
实现您自己的 ON_WM_CTLCOLOR_REFLECT 处理程序，然后在处理程序中返回您的彩色 CBrush:
Implement your own ON_WM_CTLCOLOR_REFLECT handler, then return your coloured CBrush in the handler:
(粗略地说，你需要把常用的资源管理放在那里，记住在析构函数中删除你的画笔)
(roughly, you'll need to put the usual resource management in there, rememebr to delete your brush in the destructor)
class CColorEdit : public CEdit
{
....
CBrush m_brBkgnd;
afx_msg HBRUSH CtlColor(CDC* pDC, UINT nCtlColor)
{
m_brBkgnd.DeleteObject();
m_brBkgnd.CreateSolidBrush(nCtlColor);
}
}
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