main.cpp

Wince操作系统下的一个显示、操作目录的Win32程序。

//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (C) 1993-1997  Microsoft Corporation.  All Rights Reserved.
//
//  MODULE:     main.cpp
//
//  PURPOSE:    Startup functions and error handling
//
//  PLATFORMS:  Windows CE
//
//  FUNCTIONS:
//      WinMain()           - Entry point function
//      DoMain()            - Main message loop
//      ErrorHandlerEx()    - Generic error handler code
//
//  COMMENTS:
//
//

#include <windows.h>
#include <commctrl.h>
#include "globals.h"

//----------------------------------------------------------------------------
// Prototypes

int DoMain(void);
VERSION DetermineVersion(void);

//----------------------------------------------------------------------------
// Global Variables

VERSION g_version;

//
//  FUNCTION:   WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
//
//  PURPOSE:    Entry point function, initializes the application, instance,
//              and then launches the message loop.
//
//  PARAMETERS:
//      hInstance     - handle that uniquely identifies this instance of the
//                      application
//      hPrevInstance - always zero in Win32
//      lpszCmdLine   - any command line arguements pass to the program
//      nCmdShow      - the state which the application shows itself on
//                      startup
//
//  RETURN VALUE:
//      (int) Returns the value from PostQuitMessage().
//
//  COMMENTS:
//

int WINAPI WinMain ( HINSTANCE hInstance, HINSTANCE hPrevInstance,
		LPWSTR lpszCmdLine,
                int nCmdShow)
{
    int iResult = 0;

    // Find out what OS we're running on in case we have to call any platform
    // specific code.
    g_version = DetermineVersion();

    if (InitApplication(hInstance))
       if (InitInstance(hInstance, SW_SHOW))
           iResult = DoMain();

    return iResult;
}

//
//  FUNCTION:   DoMain(void)
//
//  PURPOSE:    This is the main message loop for the application.  It
//              retrieves messages from the application's message queue and
//              dispatches the messages to the appropriate window procedure.
//
//  PARAMETERS:
//      none
//
//  RETURN VALUE:
//      (int) Returns the value passed to PostQuitMessage().
//
//  COMMENTS:
//

int DoMain( void )
{
    MSG msg;

    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);   // Translates virtual key codes
        DispatchMessage(&msg);    // Dispatches message to window procedure
    }

    return ((int) msg.wParam);
}


//
//  FUNCTION:   ErrorHandlerEx(WORD, LPSTR)
//
//  PURPOSE:    Calls GetLastError() and uses FormatMessage() to display the
//              textual information of the error code along with the file
//              and line number.
//
//  PARAMETERS:
//      wLine    - line number where the error occured
//      lpszFile - file where the error occured
//
//  RETURN VALUE:
//      none
//
//  COMMENTS:
//      This function has a macro ErrorHandler() which handles filling in
//      the line number and file name where the error occured.  ErrorHandler()
//      is always used instead of calling this function directly.
//

void ErrorHandlerEx( WORD wLine, LPTSTR lpszFile )
{
   TCHAR  szBuffer[256];
   TCHAR  szBuffer2[256];

   wsprintf(szBuffer, TEXT("An %ld error occured."), GetLastError());
   // Display the error message
   wsprintf(szBuffer2, TEXT("Generic, Line=%d, File=%s"), wLine, lpszFile);
   MessageBox(NULL, szBuffer2, szBuffer, MB_ICONEXCLAMATION | MB_OK);
    return;
}



//
//  FUNCTION:   DetermineVersion()
//
//  PURPOSE:    Returns whether the program is running on WinNT, Win32s,
//              or Win95.
//
//  PARAMETERS:
//      none
//
//  RETURN VALUE:
//      (VERSION) Returns WINNT, WIN32S, WIN95 or Pegasus
//
//  COMMENTS:
//

VERSION DetermineVersion(void)
{

#if !defined (_WIN32_WCE_EMULATION) && !defined(_WIN32_WCE)
    DWORD dwVersion;

    dwVersion = GetVersion();
    if (dwVersion < 0x80000000)
        return (WINNT);
    else
        if (LOBYTE(LOWORD(dwVersion)) < 4)
            return (WIN32S);
        else
            return (WIN95);
#else
		return (WINNT);
#endif
}