2024年5月31日发(作者：)
MFC中自定义控件的使用方式如下：
1. 创建一个新的类，继承自CWnd或CButton等需要扩展的控件类。
2. 重载控件类的消息处理函数，如OnPaint、OnLButtonDown等。
3. 在需要使用自定义控件的地方，实例化该控件类并调用其Create成员函数进行创建。
4. 将创建好的控件添加到窗口或其他容器中。
以下是一个简单的自定义控件示例：
```cpp
// MyCustomControl.h
#pragma once
class CMyCustomControl : public CButton
{
public:
CMyCustomControl();
virtual ~CMyCustomControl();
protected:
afx_msg void OnPaint();
DECLARE_MESSAGE_MAP()
};
```
```cpp
//
#include "MyCustomControl.h"
CMyCustomControl::CMyCustomControl()
{
}
CMyCustomControl::~CMyCustomControl()
{
}
BEGIN_MESSAGE_MAP(CMyCustomControl, CButton)
ON_WM_PAINT()
END_MESSAGE_MAP()
void CMyCustomControl::OnPaint()
{
CPaintDC dc(this); // device context for painting
CRect rect;
GetClientRect(&rect); // get client area rectangle
CDC memDC; // create memory device context
CompatibleDC(&dc); // create compatible DC with paint DC
CBitmap bitmap; // create bitmap object
CompatibleBitmap(&dc, (), ()); // create bitmap with
client area size
CBitmap* pOldBitmap = Object(&bitmap); // select bitmap into memory DC
for drawing
// draw your custom content here using memDC and bitmap objects
// ...
Object(pOldBitmap); // restore old bitmap object from memory DC
Object(); // delete bitmap object when done with it
DC(); // delete memory DC when done with it
}
```
在需要使用自定义控件的地方：
```cpp
// or other relevant file
#include "MyCustomControl.h"
// ...
CMyCustomControl* pCtrl = new CMyCustomControl(); // create custom control instance
pCtrl->Create(WS_CHILD | WS_VISIBLE, CRect(10, 10, 100, 50), this, IDC_MYCUSTOMCTRL); //
create custom control and add to parent window or container (e.g., CFrameWnd) as child control
with ID IDC_MYCUSTOMCTRL
```
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