用VC做界面难免会遇到要用图片做界面,但VC6显示透明PNG还是非常费劲的,本文向大家介绍如何用CxImage类实现Static控件显示透明PNG
1.创建一基于对话框的MFC工程
2.新建类CMyStatic继承CStatic,源码如下:
MyStatic.h
#if !defined(AFX_MYSTATIC_H__384ED2FD_4979_4F49_A362_EF7AEFA836B4__INCLUDED_) #define AFX_MYSTATIC_H__384ED2FD_4979_4F49_A362_EF7AEFA836B4__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 // MyStatic.h : header file // ///////////////////////////////////////////////////////////////////////////// // CMyStatic window #include ".\\include\\ximage.h" class CMyStatic : public CStatic { // Construction public: CMyStatic(); // Attributes public: // Operations public: void SetImage(CxImage *); // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CMyStatic) //}}AFX_VIRTUAL // Implementation public: virtual ~CMyStatic(); // Generated message map functions protected: //{{AFX_MSG(CMyStatic) afx_msg void OnPaint(); //}}AFX_MSG DECLARE_MESSAGE_MAP() private: CxImage *m_pImage; }; ///////////////////////////////////////////////////////////////////////////// //{{AFX_INSERT_LOCATION}} // Microsoft Visual C++ will insert additional declarations immediately before the previous line. #endif // !defined(AFX_MYSTATIC_H__384ED2FD_4979_4F49_A362_EF7AEFA836B4__INCLUDED_)
MyStatic.cpp
3.在工程中添加PNG资源// MyStatic.cpp : implementation file // #include "stdafx.h" #include "MyStatic.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CMyStatic CMyStatic::CMyStatic() { } CMyStatic::~CMyStatic() { } BEGIN_MESSAGE_MAP(CMyStatic, CStatic) //{{AFX_MSG_MAP(CMyStatic) ON_WM_PAINT() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CMyStatic message handlers void CMyStatic::OnPaint() { CPaintDC dc(this); // device context for painting RECT rect; this->GetClientRect(&rect); RGBQUAD rgb=m_pImage->GetPixelColor(1,1); m_pImage->IncreaseBpp(24); m_pImage->SetTransIndex(24); m_pImage->SetTransColor(rgb); m_pImage->Draw2(dc.m_hDC, rect); } void CMyStatic::SetImage(CxImage *pImage) { m_pImage = pImage; }
4.在头文件中
CMyStatic m_sImg;(对应要显示PNG的Static控件)
CxImage m_ximage;
5.在OnInitDialog中增加
m_sImg.SetImage(&m_ximage);
m_ximage.LoadResource(FindResource(NULL, MAKEINTRESOURCE(IDR_PNG_LOGO), "PNG"), CXIMAGE_FORMAT_PNG);
m_sImg.Invalidate();
这样就可以显示PNG图片了。