按钮上放置PNG图片

头文件“

C/C++ code

#pragma once
class PngButton : public CButton
{
DECLARE_DYNAMIC(PngButton)
public:
enum BUTTON_STATE
{
BUTTON_ENABLE = 0,
BUTTON_HOVER = 1,
BUTTON_CLICK = 2,
BUTTON_DISABLE= 3
};               //按钮状态

PngButton();
virtual ~PngButton();
protected:
afx_msg LRESULT OnMouseLeave(WPARAM wparam, LPARAM lparam);
afx_msg LRESULT OnMouseHover(WPARAM wparam, LPARAM lparam);
DECLARE_MESSAGE_MAP()
public:
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
void SetButtonImage(WCHAR* str);
afx_msg void OnMouseMove(UINT nFlags, CPoint point);
afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
BOOL m_bDisable;            // 按钮是否禁用        
    BOOL m_bCursorOnButton;     // 鼠标是否在按钮上
    BOOL m_bPress;            // 按钮是否被按下

int m_nWidth;       //图片宽
    int m_nHeight;     //图片高
    int  m_nSliceWidth;  //每一块图片的宽

Bitmap *m_btnImage;         //按钮图片
    CRect m_rectButton;               //按钮区域

protected:
virtual LRESULT DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam);
public:
afx_msg BOOL OnEraseBkgnd(CDC* pDC);
};

CPP文件：

C/C++ code

#include "stdafx.h"
#include "PngButton.h"
// PngButton

IMPLEMENT_DYNAMIC(PngButton, CButton)
PngButton::PngButton()
{
m_bDisable            = FALSE;
m_bCursorOnButton    = FALSE;
m_bPress            = FALSE;
}
PngButton::~PngButton()
{
}
BEGIN_MESSAGE_MAP(PngButton, CButton)
ON_WM_MOUSEMOVE()
ON_MESSAGE(WM_MOUSEHOVER,OnMouseHover)
ON_MESSAGE(WM_MOUSELEAVE,OnMouseLeave)
ON_WM_LBUTTONDOWN()
ON_WM_LBUTTONUP()
ON_WM_ERASEBKGND()
END_MESSAGE_MAP()
void PngButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
CDC* pDC = CDC::FromHandle(lpDrawItemStruct -> hDC);
Graphics graphics(pDC -> m_hDC);
if( m_bDisable == TRUE )
{
;
graphics.DrawImage(m_btnImage,Rect(0,0,m_nSliceWidth,m_nHeight),
BUTTON_DISABLE * m_nSliceWidth,0,m_nSliceWidth, m_nHeight,UnitPixel,NULL,NULL,NULL);
}
else
{
// click state
        if( lpDrawItemStruct -> itemState & ODS_SELECTED )
{
graphics.DrawImage (m_btnImage,Rect( 0  ,0 , m_nSliceWidth , m_nHeight),
BUTTON_CLICK * m_nSliceWidth , 0  , m_nSliceWidth , m_nHeight ,UnitPixel,NULL,NULL,NULL);
}
// hover state
        else if ( m_bPress)
{
graphics.DrawImage(m_btnImage, Rect( 0, 0, m_nSliceWidth, m_nHeight),
BUTTON_HOVER * m_nSliceWidth,0, m_nSliceWidth, m_nHeight,UnitPixel,NULL,NULL,NULL);
}
// enable state
        else
{
graphics.DrawImage(m_btnImage,Rect( 0, 0,m_nSliceWidth,m_nHeight),
BUTTON_ENABLE*m_nSliceWidth,0, m_nSliceWidth, m_nHeight,UnitPixel,NULL,NULL,NULL);
}
}
}
void PngButton::SetButtonImage( WCHAR* str )
{
m_btnImage = new Bitmap( str);
m_nWidth = m_btnImage -> GetWidth();
m_nHeight = m_btnImage -> GetHeight();
m_nSliceWidth = m_nWidth/4;   //图片切成四分

CWnd *pWnd = this -> GetParent();
GetWindowRect( &m_rectButton );
pWnd -> ScreenToClient(m_rectButton);
m_rectButton.right    = m_rectButton.left + m_nSliceWidth;
m_rectButton.bottom    = m_rectButton.top  + m_nHeight;
MoveWindow(m_rectButton);      //调整按钮大小以适应图片
}
void PngButton::OnMouseMove(UINT nFlags, CPoint point)
{
if( m_bCursorOnButton == FALSE )
{
TRACKMOUSEEVENT tme;
ZeroMemory(&tme,sizeof(TRACKMOUSEEVENT));
tme.cbSize = sizeof(tme);
tme.hwndTrack = m_hWnd;
tme.dwFlags = TME_LEAVE|TME_HOVER;
tme.dwHoverTime = 1;
m_bCursorOnButton = _TrackMouseEvent(&tme);
}
CButton::OnMouseMove(nFlags, point);
}
LRESULT PngButton::OnMouseLeave(WPARAM wparam, LPARAM lparam)
{
m_bCursorOnButton    = FALSE;
m_bPress    = FALSE;
Invalidate();
return 0L;
}
LRESULT PngButton::OnMouseHover(WPARAM wparam, LPARAM lparam)
{
m_bPress = TRUE;
Invalidate();
return 0L;
}
void PngButton::OnLButtonDown(UINT nFlags, CPoint point)
{
Invalidate();
CButton::OnLButtonDown(nFlags, point);
}
void PngButton::OnLButtonUp(UINT nFlags, CPoint point)
{
Invalidate();
CButton::OnLButtonUp(nFlags, point);
}
LRESULT PngButton::DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
if (message == WM_LBUTTONDBLCLK)
{
message = WM_LBUTTONDOWN;
}
return CButton::DefWindowProc(message, wParam, lParam);//很重要,消除双击没反应
}
BOOL PngButton::OnEraseBkgnd(CDC* pDC)
{
return true;
}

添加一个新类  然后把代码考进去

添加一个按钮到界面上 设定为用户自绘
为其增加一个变量 Control类型 选择这个按钮类就行了

初始化的时候调用 m_PngBT.SetButtonImage( L"res\\R.PNG"); (图片是PNG)