VC++中的Progress控件如何使用

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,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 \"rogressTest.h\"



#include \"rogressDialog.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:oDataExchange(CDataExchange* pDX)



{CDialog:oDataExchange(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->rogressProc();



dlg->ostMessage(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:rogressProc()



{SetMessage(\"rogress...\");



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:rogressProc()这个继承函数的函数体来适应相应的程序。