MFC CBitmapButton+文字写入

在class view的工程目录下，添加类CImgButton，继承自CBitmapButton。选择CImgButton类的property，重载DrawItem（不是Message下的WM_DRAWITEM，其响应函数OnDrawItem不会被调用到。为什么？），实现在bitmap上写入文字的功能。代码基本照搬http://topic.csdn.net/u/20070611/09/d59ec937-70b1-49f2-b8df-ff44a87b1a04.html里的，附于本文后。使用时，

1）在dialog中拖入一个button，设置ownerdraw。

2）装载需要的位图资源。

3）对话框头文件中 #include "ImgButton.h" CImgButton m_cImgBtn;

4）对话框cpp中 

m_cImgBtn.SubclassDlgItem(IDC_BUTTON5, this);

 m_cImgBtn.LoadBitmaps(IDB_BTNLONGU, IDB_BTNLONGD, IDB_BTNLONGU);

 m_cImgBtn.SizeToContent();  

m_cImgBtn.SetTextColor(RGB(0,0,0));

完成。

CImgButton代码：

 1 #pragma once
 2 
 3 
 4 // CImgButton
 5 
 6 class CImgButton : public CBitmapButton
 7 {
 8     DECLARE_DYNAMIC(CImgButton)
 9 
10 public:
11     CImgButton();
12     virtual ~CImgButton();
13 
14 protected:
15     DECLARE_MESSAGE_MAP()
16 public:
17 
18 public: 
19     COLORREF TextColor; 
20     void SetTextColor(COLORREF crColor); 
21 
22     virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
23 };
24 
25 
26 
27 
28 // ImgButton.cpp : implementation file
29 //
30 
31 #include "stdafx.h"
32 #include "win32Test.h"
33 #include "ImgButton.h"
34 
35 
36 // CImgButton
37 
38 IMPLEMENT_DYNAMIC(CImgButton, CBitmapButton)
39 
40 CImgButton::CImgButton()
41 {
42 
43 }
44 
45 CImgButton::~CImgButton()
46 {
47 }
48 
49 
50 BEGIN_MESSAGE_MAP(CImgButton, CBitmapButton)
51 END_MESSAGE_MAP()
52 
53 
54 void CImgButton::SetTextColor(COLORREF crColor) 
55 { 
56     TextColor = crColor; 
57 } 
58 
59 void CImgButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
60 {
61 
62     // TODO:  Add your code to draw the specified item
63     CRect rect = lpDrawItemStruct->rcItem; 
64     CDC *pDC = CDC::FromHandle(lpDrawItemStruct->hDC); 
65     int nSaveDC = pDC->SaveDC(); 
66     UINT state = lpDrawItemStruct->itemState; 
67     TCHAR strText[MAX_PATH + 1]; 
68     ::GetWindowText(m_hWnd, strText, MAX_PATH); 
69 
70     CBitmapButton::DrawItem(lpDrawItemStruct); 
71 
72     pDC->SetTextColor(TextColor); 
73     if (strText!=NULL) 
74     { 
75         CFont *hFont = GetFont(); 
76         CFont *hOldFont = pDC->SelectObject(hFont); 
77         CSize szExtent = pDC->GetTextExtent(strText, lstrlen(strText)); 
78         CPoint pt(rect.CenterPoint().x - szExtent.cx / 2, rect.CenterPoint().y - szExtent.cy / 2); 
79         if (state & ODS_SELECTED)   
80         {
81             pt.Offset(1, 1); 
82         }
83         int nMode = pDC->SetBkMode(TRANSPARENT); 
84         if (state & ODS_DISABLED) 
85         {
86             pDC->DrawState(pt, szExtent, strText, DSS_DISABLED, TRUE, 0, (HBRUSH)NULL); 
87         }
88         else 
89         {
90             pDC->DrawState(pt, szExtent, strText, DSS_NORMAL, TRUE, 0, (HBRUSH)NULL); 
91         }
92         pDC->SelectObject(hOldFont); 
93         pDC->SetBkMode(nMode); 
94     } 
95 
96     pDC->RestoreDC(nSaveDC); 
97 }