谈VC++中的Progress控件的使用

         Progress控件能让人们感受到一个应用程序执行的进度,在很多应用程序中都能用到它,但通常只支持在单任务中,我在Windows98/NT中文操作系统下,在VC++6.0环境下,利用线程编制了一个非常小巧的应用程序来实现Progress控件的使用。它可以支持多线程,使用起来很方便。
以下是这个应用程序的源代码:

//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; //进程条标题

CButton m_CancelButton; //中止按钮控键

CProgressCtrl

m_ProgressCtrl;

//}}AFX_DATA

CString m_Caption;

　 //对话框标题

BOOL m_EnableCancel; //中止按钮显示开关

BOOL m_IsCancel; //中止按钮是否按下开关

HANDLE m_Thread;

　 //线程句柄

static DWORD WINAPI ThreadProc(CProgressDialog* dlg); //静态线程

void SetProgress(int percent) //设置进程位置

{ m_ProgressCtrl.SetPos(percent);}

void SetMessage(LPCSTR msg) //设置进程条标题

{ m_MessageStatic.SetWindowText(msg);}

BOOL IsCancel(void)

{ return m_IsCancel;}

virtual DWORD ProgressProc()=0;//线程过程纯虚函数

// 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(); //继承过程

};

// 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;

}

只需在应用Progress控件的地方调用CMyProgressDialog类的对象即可。可根据不同的应用程序修改DWORD CMyProgressDialog::ProgressProc()这个继承函数的函数体来适应相应的程序。

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