談VC++中的Progress控件的使用

大連捷通電腦技術有限公司 王淼(jtone@mail.dlptt.ln.cn)

Progress控件能讓人們感受到一個應用程序執行的進度,在很多應用程序中都能用到它,但通常只支持在單任務中,我在Windows98/NT中文操作系統下,在VC++6.0環境下,利用線程編制了一個非常小巧的應用程序來實現Progress控件的使用。它可以支持多線程,使用起來很方便。

以下是這個應用程序的源代碼:

//ProgressDialog.h

class CProgressDialog : public CDialog

{

// Construction

public:

CProgressDialog(LPCSTR caption, BOOL

enableCancel=TRUE, CWnd* pParent = NULL);

// standard constructor

virtual ～CProgressDialog(void);

// Dialog Data

//{{AFX_DATA(CProgressDialog)

enum { IDD = IDD_PROGRESS_DIALOG };

CStatic

m_MessageStatic; //進程條標題

CButton m_CancelButton; //中止按鈕控鍵

CProgressCtrl

m_ProgressCtrl;

//}}AFX_DATA

CString m_Caption;

　 //對話框標題

BOOL m_EnableCancel; //中止按鈕顯示開關

BOOL m_IsCancel; //中止按鈕是否按下開關

HANDLE m_Thread;

　 //線程句柄

static DWORD WINAPI ThreadProc(CProgressDialog* dlg); //靜態線程

void SetProgress(int percent) //設置進程位置

{ m_ProgressCtrl.SetPos(percent);}

void SetMessage(LPCSTR msg) //設置進程條標題

{ m_MessageStatic.SetWindowText(msg);}

BOOL IsCancel(void)

{ return m_IsCancel;}

virtual DWORD ProgressProc()=0;//線程過程純虛函數

// Overrides

// ClassWizard generated virtual function overrides

//{{AFX_VIRTUAL(CProgressDialog)

protected:

virtual void DoDataExchange(CDataExchange* pDX);

　// DDX/DDV support

//}}AFX_VIRTUAL

// Implementation

protected:

// Generated message map functions

//{{AFX_MSG(CProgressDialog)

virtual BOOL OnInitDialog();

virtual void OnCancel();

virtual void OnOK();

//}}AFX_MSG

DECLARE_MESSAGE_MAP()

};

class CMyProgressDialog:public CProgressDialog {

public:

CMyProgressDialog(LPCSTR caption):CProgressDialog(caption) {}

virtual DWORD ProgressProc(); //繼承過程

};

// ProgressDialog.cpp

#include "stdafx.h"

#include "ProgressTest.h"

#include "ProgressDialog.h"

#ifdef _DEBUG

#define new DEBUG_NEW

#undef THIS_FILE

static char THIS_FILE[] = __FILE__;

#endif

CProgressDialog::CProgressDialog(LPCSTR caption, BOOL enableCancel, CWnd* pParent /*=NULL*/) :

CDialog(CProgressDialog::IDD, pParent)

{

//{{AFX_DATA_INIT(CProgressDialog)

m_Caption=caption;

m_EnableCancel=enableCancel;

m_IsCancel=FALSE;

m_Thread=NULL;

//}}AFX_DATA_INIT

}

CProgressDialog::～CProgressDialog(void)

{

if (m_Thread) {

CloseHandle(m_Thread);

}

}

void

CProgressDialog::DoDataExchange(CDataExchange* pDX)

{

CDialog::DoDataExchange(pDX);

//{{AFX_DATA_MAP(CProgressDialog)

DDX_Control (pDX IDC_MESSAGE_STATIC, m_MessageStatic);

DDX_Control(pDX, IDCANCEL, m_CancelButton);

DDX_Control(pDX, IDC_PROGRESS, m_ProgressCtrl);

//}}AFX_DATA_MAP

}

BEGIN_MESSAGE_MAP(CProgressDialog, CDialog)

//{{AFX_MSG_MAP(CProgressDialog)

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

// CProgressDialog message handlersBOOL CProgressDialog::OnInitDialog()

{

CDialog::OnInitDialog();

// TODO: Add extra initialization here

m_ProgressCtrl.SetRange(0, 100);

m_ProgressCtrl.SetPos(0);

SetWindowText(m_Caption);

if (!m_EnableCancel) {

m_CancelButton.ShowWindow(SW_HIDE);

}

DWORD threadID;

m_Thread=CreateThread(NULL, 0,

(LPTHREAD_START_ROUTINE)CProgressDialog::Thread

Proc,(LPVOID)this,0,&threadID);

return TRUE; // return TRUE unless you set the focus to a control

　 // EXCEPTION: OCX Property Pages should return

FALSE

}

DWORD WINAPI

CProgressDialog::ThreadProc(CProgressDialog* dlg)

{

DWORD ret=dlg->ProgressProc();

dlg->PostMessage(WM_COMMAND, IDOK);

return ret;

}

void CProgressDialog::OnCancel()

{

// TODO: Add extra cleanup here

if (m_EnableCancel) m_IsCancel=TRUE;

}

void CProgressDialog::OnOK()

{

// TODO: Add extra validation here

WaitForSingleObject(m_Thread, INFINITE);

CDialog::OnOK();

}

DWORD CMyProgressDialog::ProgressProc()

{

SetMessage("Progress...");

for (int i=0;i<100;i++) {

　if (IsCancel()) break;

Sleep(100);

SetProgress(i);

}

return 0;

}

只需在應用Progress控件的地方調用CMyProgressDialog類的對象即可?？筛鶕煌膽贸绦蛐薷腄WORD CMyProgressDialog::ProgressProc()這個繼承函數的函數體來適應相應的程序。

原文轉自：http://www.kjueaiud.com