VC++开发一个简易图片浏览器

win7, vc6; 新建一个对话框工程；界面；

添加按钮单击函数；

为控件添加成员变量；

添加列表框消息处理函数；

搞几个测试图片；

对话框头文件手动添加成员函数 ShowJpg；

// Construction
public:
CTestjpgDlg(CWnd* pParent = NULL); // standard constructor
bool ShowJpg(CDC* ,CString , int , int);

对话框Cpp文件全部代码如下；

// testjpgDlg.cpp : implementation file
//#include "stdafx.h"
#include "testjpg.h"
#include "testjpgDlg.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/
// CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialog
{
public:CAboutDlg();// Dialog Data//{{AFX_DATA(CAboutDlg)enum { IDD = IDD_ABOUTBOX };//}}AFX_DATA// ClassWizard generated virtual function overrides//{{AFX_VIRTUAL(CAboutDlg)protected:virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support//}}AFX_VIRTUAL// Implementation
protected://{{AFX_MSG(CAboutDlg)//}}AFX_MSGDECLARE_MESSAGE_MAP()
};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{//{{AFX_DATA_INIT(CAboutDlg)//}}AFX_DATA_INIT
}void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{CDialog::DoDataExchange(pDX);//{{AFX_DATA_MAP(CAboutDlg)//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)//{{AFX_MSG_MAP(CAboutDlg)// No message handlers//}}AFX_MSG_MAP
END_MESSAGE_MAP()/
// CTestjpgDlg dialogCTestjpgDlg::CTestjpgDlg(CWnd* pParent /*=NULL*/): CDialog(CTestjpgDlg::IDD, pParent)
{//{{AFX_DATA_INIT(CTestjpgDlg)m_names = _T("");//}}AFX_DATA_INIT// Note that LoadIcon does not require a subsequent DestroyIcon in Win32m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}void CTestjpgDlg::DoDataExchange(CDataExchange* pDX)
{CDialog::DoDataExchange(pDX);//{{AFX_DATA_MAP(CTestjpgDlg)DDX_Control(pDX, IDC_LIST1, m_list1);DDX_Text(pDX, IDC_EDIT1, m_names);//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CTestjpgDlg, CDialog)//{{AFX_MSG_MAP(CTestjpgDlg)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_BUTTON1, OnButton1)ON_LBN_SELCHANGE(IDC_LIST1, OnSelchangeList1)//}}AFX_MSG_MAP
END_MESSAGE_MAP()/
// CTestjpgDlg message handlersBOOL CTestjpgDlg::OnInitDialog()
{CDialog::OnInitDialog();// Add "About..." menu item to system menu.// IDM_ABOUTBOX must be in the system command range.ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);ASSERT(IDM_ABOUTBOX < 0xF000);CMenu* pSysMenu = GetSystemMenu(FALSE);if (pSysMenu != NULL){CString strAboutMenu;strAboutMenu.LoadString(IDS_ABOUTBOX);if (!strAboutMenu.IsEmpty()){pSysMenu->AppendMenu(MF_SEPARATOR);pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);}}// Set the icon for this dialog.  The framework does this automatically//  when the application's main window is not a dialogSetIcon(m_hIcon, TRUE);            // Set big iconSetIcon(m_hIcon, FALSE);     // Set small icon// TODO: Add extra initialization herereturn TRUE;  // return TRUE  unless you set the focus to a control
}void CTestjpgDlg::OnSysCommand(UINT nID, LPARAM lParam)
{if ((nID & 0xFFF0) == IDM_ABOUTBOX){CAboutDlg dlgAbout;dlgAbout.DoModal();}else{CDialog::OnSysCommand(nID, lParam);}
}// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.void CTestjpgDlg::OnPaint()
{if (IsIconic()){CPaintDC dc(this); // device context for paintingSendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);// Center icon in client rectangleint cxIcon = GetSystemMetrics(SM_CXICON);int cyIcon = GetSystemMetrics(SM_CYICON);CRect rect;GetClientRect(&rect);int x = (rect.Width() - cxIcon + 1) / 2;int y = (rect.Height() - cyIcon + 1) / 2;// Draw the icondc.DrawIcon(x, y, m_hIcon);}else{CDialog::OnPaint();}
}// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CTestjpgDlg::OnQueryDragIcon()
{return (HCURSOR) m_hIcon;
}void CTestjpgDlg::OnButton1()
{// TODO: Add your control notification handler code hereCString sFolderPath;BROWSEINFO bi;char Buffer[MAX_PATH];bi.hwndOwner = NULL;bi.pidlRoot =NULL;bi.pszDisplayName = Buffer;bi.lpszTitle = "选择目录";//bi.ulFlags = BIF_BROWSEINCLUDEFILES;//包括文件bi.ulFlags = BIF_EDITBOX;//包括文件bi.lpfn = NULL;bi.iImage=IDR_MAINFRAME;LPITEMIDLIST pIDList = SHBrowseForFolder(&bi);//显示选择对话框if(pIDList){SHGetPathFromIDList(pIDList, Buffer);//取得文件夹路径到Buffer里sFolderPath = Buffer;//将文件夹路径保存在一个CString对象里}LPMALLOC lpMalloc;if(FAILED(SHGetMalloc(&lpMalloc)))return;lpMalloc->Free(pIDList);lpMalloc->Release();m_names = sFolderPath;UpdateData(FALSE);SetCurrentDirectory(sFolderPath);CFileFind finder;BOOL bw = finder.FindFile("*.jpg");while(bw){bw=finder.FindNextFile();         m_list1.AddString(finder.GetFileName());}}void CTestjpgDlg::OnSelchangeList1()
{// TODO: Add your control notification handler code hereCString strText;int nCurSel;          nCurSel = m_list1.GetCurSel();m_list1.GetText(nCurSel, strText); CDC* pDC1 = GetDlgItem(IDC_STATIC)->GetDC();ShowJpg(pDC1,m_names + "\\" + strText ,0,0);
}bool CTestjpgDlg::ShowJpg(CDC* pDC,CString strPath, int x, int y)
{IStream *pStm; CFileStatus fstatus; CFile file; LONG cb;//MessageBox(strPath,"选择的文件is：",MB_OK);if (file.Open(strPath,CFile::modeRead)&&file.GetStatus(strPath,fstatus)&&((cb = fstatus.m_size) != -1)) { HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, cb); LPVOID pvData = NULL; if (hGlobal != NULL) { pvData = GlobalLock(hGlobal);if (pvData != NULL) { file.Read(pvData, cb); GlobalUnlock(hGlobal); CreateStreamOnHGlobal(hGlobal, TRUE, &pStm); }}}else{return false;}IPicture *pPic = NULL;if(SUCCEEDED(OleLoadPicture(pStm,fstatus.m_size,TRUE,IID_IPicture,(LPVOID*)&pPic))){OLE_XSIZE_HIMETRIC hmWidth; OLE_YSIZE_HIMETRIC hmHeight; pPic->get_Width(&hmWidth); pPic->get_Height(&hmHeight); double fX,fY;//get image height and widthfX = (double)pDC->GetDeviceCaps(HORZRES)*(double)hmWidth/((double)pDC->GetDeviceCaps(HORZSIZE)*100.0); fY = (double)pDC->GetDeviceCaps(VERTRES)*(double)hmHeight/((double)pDC->GetDeviceCaps(VERTSIZE)*100.0);         //use render function display imageif(FAILED(pPic->Render(*pDC,x,y,(DWORD)fX,(DWORD)fY,0,hmHeight,hmWidth,-hmHeight,NULL))) {pPic->Release();return false;}pPic->Release();} else return false; return true;
}

运行；如下二图；

有时间再继续；

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