CImage类显示图片
CImage是MFC和ATL共享的新類，它能從外部磁盤中調(diào)入一個(gè)JPEG、GIF、BMP和PNG格式的圖像文件加以顯示，而且這些文件格式可以相互轉(zhuǎn)換。
單純顯示圖片：
CDC *pDc =GetDC();
CImage CImageTest;
CImageTest.Load(strFile);
CImageTest.Draw(pDc->GetSafeHdc(),0,0,CImageTest.GetWidth(),CImageTest.GetHeight(),0,0,CImageTest.GetWidth(),CImageTest.GetHeight());
做背景圖片：
{
?? ?// TODO: 在此添加消息處理程序代碼和/或調(diào)用默認(rèn)值
?? ?//窗口寬和高
?? ?int frameWidth;int frameHeight;
?? ?//背景圖片
?? ?CImage imageBKG;
?? ?//imageBKG.Load(_T("res\\UpdateBKG.bmp"));
?? ?imageBKG.LoadFromResource(AfxGetInstanceHandle(),IDB_BIT_BKG);
?? ?frameWidth=imageBKG.GetWidth();
?? ?frameHeight=imageBKG.GetHeight();
?? ?imageBKG.BitBlt(pDC->GetSafeHdc(),0,0,frameWidth,frameHeight,0,0,SRCCOPY);
?? ?CRect rc;
?? ?GetWindowRect(&rc);
?? ?MoveWindow(rc.left,rc.top,frameWidth,frameHeight);
?? ?//更新中
?? ?CImage imageWarning;
?? ?//imageWarning.Load(_T("res\\gengxinzhong.bmp"));
?? ?imageWarning.LoadFromResource(AfxGetInstanceHandle(),IDB_BIT_ZHONG);
?? ?imageWarning.BitBlt(pDC->GetSafeHdc(),45,40,frameWidth,60,0,0,SRCCOPY);
?? ?//進(jìn)度條
?? ?CImage imageProcess;
?? ?//imageProcess.Load(_T("res\\process.bmp"));
?? ?imageProcess.LoadFromResource(AfxGetInstanceHandle(),IDB_BIT_PROCESS);
?? ?imageProcess.TransparentBlt(pDC->GetSafeHdc(),40,100,300,17,RGB(255,255,255));
?? ?CRect rcProcess(40+15,100+2,40+283,100+14);
?? ?((CWnd*)GetDlgItem(IDC_PROGRESS_DOWNLOAD))->MoveWindow(rcProcess);
?? ?//狀態(tài)顯示
?? ?//CWnd *pWndStatus=GetDlgItem(IDC_STATIC_SHOWSTATUS);
?? ?//::MoveWindow(pWndStatus->GetSafeHwnd(),60,frameHeight-35,250,25,TRUE);
?? ?return true;//CDialog::OnEraseBkgnd(pDC);
}
///
CImage類加載PNG文件的的時(shí)候必須得從文件路徑加載，要想從資源文件那里加載必須得寫一個(gè)函數(shù)，此處提供了一個(gè)類，繼承自CImage
頭文件：
#pragma once
// CMyImage
class CMyImage : public CImage
{
?? ?//DECLARE_DYNAMIC(CMyImage)
public:
?? ?CMyImage();
?? ?virtual ~CMyImage();
?? ?//從資源中加載PNG
?? ?BOOL ImageFromIDResource(UINT nID);
protected:
?? ?//DECLARE_MESSAGE_MAP()
};
主文件：
// MyImage.cpp : 實(shí)現(xiàn)文件
//
#include "stdafx.h"
#include "ClientUpdate.h"
#include "MyImage.h"
// CMyImage
//IMPLEMENT_DYNAMIC(CMyImage, CImage)
CMyImage::CMyImage()
{
}
CMyImage::~CMyImage()
{
}
//BEGIN_MESSAGE_MAP(CMyImage, CImage)
//END_MESSAGE_MAP()
// CMyImage 消息處理程序
BOOL CMyImage::ImageFromIDResource(UINT nID)
{
?? ?LPCTSTR sTR = _T("PNG");
?? ?HINSTANCE hInst = AfxGetResourceHandle();
?? ?HRSRC hRsrc = ::FindResource (hInst,MAKEINTRESOURCE(nID),sTR); // type
?? ?if (!hRsrc)
?? ??? ?return FALSE;
?? ?// load resource into memory
?? ?DWORD len = SizeofResource(hInst, hRsrc);
?? ?BYTE* lpRsrc = (BYTE*)LoadResource(hInst, hRsrc);
?? ?if (!lpRsrc)
?? ??? ?return FALSE;
?? ?// Allocate global memory on which to create stream
?? ?HGLOBAL m_hMem = GlobalAlloc(GMEM_FIXED, len);
?? ?BYTE* pmem = (BYTE*)GlobalLock(m_hMem);
?? ?memcpy(pmem,lpRsrc,len);
?? ?IStream* pstm;
?? ?CreateStreamOnHGlobal(m_hMem,FALSE,&pstm);
?? ?// load from stream
?? ?//m_Image.Load(pstm);
?? ?//父類調(diào)用
?? ?Load(pstm);
?? ?// free/release stuff
?? ?GlobalUnlock(m_hMem);
?? ?pstm->Release();
?? ?FreeResource(lpRsrc);
}
或者采用CPngImage類進(jìn)行一下轉(zhuǎn)化：
CImage ImageDownloadScale;
??? //CPngImage image;
?? ?//image.Load(IDB_PNG_STATUS_PROGRESS);
?? ?//ImageDownloadScale.Attach((HBITMAP)image.Detach());
總結(jié)
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