VC中GDI+双缓冲实现Picture控件中显示png图片

旧城等待， 2023-10-18 08:26 51阅读 0赞

资源下载地址：[http://download.csdn.net/detail/zzzili/4177527][http_download.csdn.net_detail_zzzili_4177527]

\#ifndef \_CMYSTATIC  
\#define \_CMYSTATIC

\#include "StdAfx.h"  
\#include "gdiplus.h"  
\#pragma comment(lib,"gdiplus.lib")  
using namespace Gdiplus;

/\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
\* Class Name : CMyImage  
\*  
\* Description : 资源图片类，继承自 Image 类  
\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*/  
class CMyImage:public Image  
\{  
public:  
CMyImage(UINT uID, LPCTSTR pszRsrcType)  
\{  
// 初始化 Image 成员变量  
nativeImage = NULL;  
lastResult = InvalidParameter;

// 查找图片资源  
HINSTANCE hInst = GetModuleHandle(NULL);  
HRSRC hRsrc = FindResource(hInst, MAKEINTRESOURCE(uID), pszRsrcType);  
if (!hRsrc) \{  
return;  
\}

// 加载资源并获取其指针  
HGLOBAL hMemRsrc = LoadResource(hInst, hRsrc);  
BYTE \* pMemRsrc = (BYTE \*)LockResource(hMemRsrc);

// 为流分配全局内存空间  
size\_t sizeRsrc = SizeofResource(hInst, hRsrc);  
HGLOBAL hMemStrm = GlobalAlloc(GMEM\_FIXED, sizeRsrc);  
if (!hMemStrm) \{  
return;  
\}

// 拷贝图片资源到全局内存空间中  
BYTE \* pMemStrm = (BYTE \*)GlobalLock(hMemStrm);  
memcpy(pMemStrm, pMemRsrc, sizeRsrc);

// 使用图片资源流构造 Image 对象  
IStream \* pStrm = NULL;  
CreateStreamOnHGlobal(hMemStrm, TRUE, &pStrm);  
lastResult = DllExports::GdipLoadImageFromStream(pStrm, &nativeImage);  
pStrm->Release();

\}  
  
\};

/\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
\* Class Name : CMyCStatic  
\*  
\* Description : Picture Control 类，实现png图片的显示，继承自 CStatic 类  
\*  
\*使用方法：1.使用前初始化GDI+  
2.在CXXDlg类中关联Pinture控件，用SetPngPicFrom..从文件或资源中获取要  
显示的png图片，然后在CXXDlg中添加消息映射  
BEGIN\_MESSAGE\_MAP(CMyStatic, CStatic)  
//\{ \{AFX\_MSG\_MAP(CFlowCtrl)  
ON\_WM\_PAINT()  
//\}\}AFX\_MSG\_MAP  
END\_MESSAGE\_MAP()  
\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*/

class CMyStatic : public CStatic  
\{  
private:  
BOOL m\_isSetfile;  
DWORD m\_col;  
CDC \*m\_pDC;  
RECT m\_rect;  
CMyImage \*m\_image;  
public:  
DECLARE\_MESSAGE\_MAP()  
private:  
afx\_msg void OnPaint(void)  
\{  
if(m\_isSetfile)  
\{  
m\_pDC = this->GetDC();  
CDC dcMem;  
CBitmap bitmap;  
bitmap.CreateCompatibleBitmap(m\_pDC,m\_rect.right-m\_rect.left,m\_rect.bottom-m\_rect.top);  
dcMem.CreateCompatibleDC(m\_pDC);  
CBitmap \*pOld = dcMem.SelectObject(&bitmap);  
CBrush br;  
br.CreateSolidBrush(m\_col);  
Graphics \*graphics=NULL;  
graphics=Graphics::FromHDC(dcMem);

dcMem.FillRect(&m\_rect, &br);//纯色覆盖  
graphics->DrawImage(m\_image,0,0,m\_image->GetWidth(),m\_image->GetHeight());

m\_pDC->BitBlt(0,0,300,300,&dcMem,0,0,SRCCOPY); //双缓冲  
bitmap.DeleteObject();  
ReleaseDC(&dcMem);  
ReleaseDC(m\_pDC);  
\}  
\};  
public:  
void SetPngPicFromFile(CString path)  
\{  
m\_isSetfile = TRUE;  
m\_col = GetSysColor(COLOR\_3DFACE);//获取对话框背景颜色  
  
this->GetClientRect(&m\_rect);  
m\_image =(CMyImage\*)new Image(path.GetBuffer(0));  
SetWindowPos(&wndTop,0,0, m\_image->GetWidth(),m\_image->GetHeight(),SWP\_SHOWWINDOW);  
  
OnPaint();  
\}  
CMyStatic()  
\{  
m\_isSetfile = FALSE;  
\}  
void SetPngPicFromResource(int id,CString type)  
\{  
m\_isSetfile = TRUE;  
m\_col = GetSysColor(COLOR\_3DFACE);  
  
this->GetClientRect(&m\_rect);  
m\_image = new CMyImage(id,type.GetBuffer(0));  
SetWindowPos(&wndTop,0,0, m\_image->GetWidth(),m\_image->GetHeight(),SWP\_SHOWWINDOW);  
OnPaint();  
\}  
~CMyStatic()  
\{  
  
\}  
\};

\#endif

[http_download.csdn.net_detail_zzzili_4177527]: http://download.csdn.net/detail/zzzili/4177527