VC++中如何使用Progress控件

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,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。可根據不同的應用程序修改DWORD CMyProgressDialog::ProgressProc()這個繼承函數的函數體來適應相應的程序。