一个简单的带消息循环的控制面板选项例程

//========================================================================
//TITLE:
// 一个简单的带消息循环的控制面板选项例程
//AUTHOR:
// norains
//DATE:
// Thursday 16-May-2007
//Environment:
// EVC4.0 + Standard SDK 4.2
// EVC4.0 + Standard SDK 5.0
//========================================================================

普通的应用程序可以在WinMain()中进行消息循环,当然CPL也可以,不过不是在DllMain(),而是在CPlApplet接收CPL_DBLCLK时.本文给出了一个很简单的在控制面板创建对话框的例子.

关于控制面板的功能和架构在我的其它文章里已经有介绍,这里就不再陈诉,而直接罗列代码.对本章所列代码有所不明白的朋友可以参考以下这几篇文章:
WinCE 控制面板的创建:http://blog.csdn.net/norains/archive/2006/02/25/609216.aspx
WinCE 控制面板和驱动通信:http://blog.csdn.net/norains/archive/2006/02/25/609217.aspx
详解WINCE的控制面板:http://blog.csdn.net/norains/archive/2006/09/07/1189143.aspx






/**/////////////////////////////////////////////////////////////////////////


// DisplayOutput.cpp : Defines the entry point for the DLL application.


//




/**////////////////////////////////////////////////////////////////////////




#include "stdafx.h"


#include "D:/ProgramFiles/WINCE500/PUBLIC/COMMON/OAK/INC/Cpl.h"


#include "resource.h"


#include "Maindlg.h"


//---------------------------------------------------------------------


//Macro define




#define CPL_TITLE TEXT("简单例程")


#define CPL_INFO TEXT("这是一个很简单例程的信息")




// Returns the number of characters in an expression.


#define LENGTHOF(exp) ((sizeof((exp)))/sizeof((*(exp))))




//--------------------------------------------------------------------------------


//Global data


HMODULE g_hModule = NULL; // Handle to the DLL.






//--------------------------------------------------------------------------------


//Description:


// Main entry point for the Control Panel DLL.


//--------------------------------------------------------------------------------------------


BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)




...{


switch(ul_reason_for_call)




...{


case DLL_PROCESS_ATTACH:




...{


g_hModule = (HMODULE) hModule;


break;


}


case DLL_THREAD_ATTACH:


case DLL_THREAD_DETACH:


case DLL_PROCESS_DETACH:


break;


}




return TRUE;


}










//--------------------------------------------------------------------------------------------


//Description:


// The entry point to the Control Panel application.


// -------------------------------------------------------------------------------------------


extern "C" LONG CALLBACK CPlApplet(HWND hwndCPL,UINT message, LPARAM lParam1, LPARAM lParam2)




...{







switch (message)




...{


case CPL_INIT:


// Perform global initializations, especially memory


// allocations, here.


// Return 1 for success or 0 for failure.


// Control Panel does not load if failure is returned.


return 1;




case CPL_GETCOUNT:


// The number of actions supported by this Control


// Panel application.


return 1;




case CPL_NEWINQUIRE:


// This message is sent once for each dialog box, as


// determined by the value returned from CPL_GETCOUNT.


// lParam1 is the 0-based index of the dialog box.


// lParam2 is a pointer to the NEWCPLINFO structure.




...{


ASSERT(0 == lParam1);


ASSERT(lParam2);






NEWCPLINFO* lpNewCplInfo = (NEWCPLINFO *) lParam2;


if (lpNewCplInfo)




...{


lpNewCplInfo->dwSize = sizeof(NEWCPLINFO);


lpNewCplInfo->dwFlags = 0; //Ignored


lpNewCplInfo->dwHelpContext = 0; //Ignored


lpNewCplInfo->lData = IDI_ICON;




// The large icon for this application. Do not free this


// HICON; it is freed by the Control Panel infrastructure.


lpNewCplInfo->hIcon = LoadIcon(g_hModule,MAKEINTRESOURCE(IDI_ICON));


if(_tcslen(CPL_TITLE) < LENGTHOF(lpNewCplInfo->szName))




...{


_tcscpy(lpNewCplInfo->szName,CPL_TITLE);


}


if(_tcslen(CPL_INFO) < LENGTHOF(lpNewCplInfo->szInfo))




...{


_tcscpy(lpNewCplInfo->szInfo,CPL_INFO);


}


_tcscpy(lpNewCplInfo->szHelpFile, _T(""));






return 0;


}


return 1; // Nonzero value means CPlApplet failed.





}




case CPL_DBLCLK:




...{


// The user has double-clicked the icon for the


// dialog box in lParam1 (zero-based).


HWND hWnd = FindWindow(NULL,WND_TITLE);


if(hWnd != NULL)




...{


SetForegroundWindow(hWnd);


return 1;


}




CMainDlg *pWnd = CMainDlg::GetInstance();


if(pWnd != NULL)




...{


pWnd->ShowWindow(g_hModule,TRUE);


}








MSG msg;


while(GetMessage(&msg,NULL,0,0))




...{


TranslateMessage(&msg);


DispatchMessage(&msg);


}


return 1; // CPlApplet failed.


}




case CPL_STOP:


// Called once for each dialog box. Used for cleanup.


case CPL_EXIT:


// Called only once for the application. Used for cleanup.


default:


return 0;


}








return 1; // CPlApplet failed.


} // CPlApplet






/**///////////////////////////////////////////////////////////////////////


// MainDlg.h: interface for the CMainDlg class.


//




/**///////////////////////////////////////////////////////////////////////


#ifndef MAINDLG_H


#define MAINDLG_H






//---------------------------------------------------------------------


//Macro define


#define WND_TITLE TEXT("Hello World")


//---------------------------------------------------------------------




class CMainDlg




...{


public:


static CMainDlg * GetInstance();


BOOL ShowWindow(HINSTANCE hInst,BOOL bShow);


virtual ~CMainDlg();




protected:


void OnDestroy(HWND hWnd,UINT wMsg,WPARAM wParam,LPARAM lParam);


static BOOL WinProc(HWND hWnd, UINT wMsg, WPARAM wParam,LPARAM lParam);


static CMainDlg *m_pInstance;


HWND m_hWnd;


HINSTANCE m_hInst;




private:


CMainDlg();


};




#endif // #ifndef MAINDLG_H








/**////////////////////////////////////////////////////////////////////////


// MainDlg.cpp: implementation of the CMainDlg class.


//




/**///////////////////////////////////////////////////////////////////////




#include "stdafx.h"


#include "MainDlg.h"


#include "resource.h"






//---------------------------------------------------------------------


//Initialize the data


CMainDlg *CMainDlg::m_pInstance = NULL;


//-----------------------------------------------------------------------




/**///////////////////////////////////////////////////////////////////////


// Construction/Destruction




/**///////////////////////////////////////////////////////////////////////




CMainDlg::CMainDlg()




...{


m_hWnd = NULL;


m_hInst = NULL;


}




CMainDlg::~CMainDlg()




...{


if(m_pInstance != NULL)




...{


delete m_pInstance;


m_pInstance = NULL;


}


}






//---------------------------------------------------------------------


//Description:


// Show the dialog


//---------------------------------------------------------------------


BOOL CMainDlg::ShowWindow(HINSTANCE hInst, BOOL bShow)




...{


m_hInst = hInst;


m_hWnd = CreateDialog(hInst,MAKEINTRESOURCE(IDD_MAIN),NULL,WinProc);









if(m_hWnd == NULL)




...{


return FALSE;


}





if(bShow == TRUE)




...{


::ShowWindow(m_hWnd,SW_SHOW);


}


else




...{


::ShowWindow(m_hWnd,SW_HIDE);


}


SetForegroundWindow(m_hWnd);






return TRUE;


}








//---------------------------------------------------------------------


//Description:


// The window process


//---------------------------------------------------------------------


BOOL CMainDlg::WinProc(HWND hWnd, UINT wMsg, WPARAM wParam, LPARAM lParam)




...{


switch(wMsg)




...{


case WM_COMMAND:




...{


switch(LOWORD(wParam))




...{


case IDCANCEL:


DestroyWindow(hWnd);


return TRUE;


}


}


case WM_DESTROY:


m_pInstance->OnDestroy(hWnd,wMsg,wParam,lParam);


return TRUE;


}


return FALSE;


}








//---------------------------------------------------------------------


//Description:


// Get the instance


//---------------------------------------------------------------------


CMainDlg * CMainDlg::GetInstance()




...{


if(m_pInstance == NULL)




...{


m_pInstance = new CMainDlg();


}




return m_pInstance;


}










//---------------------------------------------------------------------


//Description:


// On the message WM_DESTROY


//---------------------------------------------------------------------


void CMainDlg::OnDestroy(HWND hWnd, UINT wMsg, WPARAM wParam, LPARAM lParam)




...{


PostQuitMessage(0x0);


}