代码解释：Visual C++ 设备项目中由向导生成的代码

项目
09/04/2008

更新：2007 年 11 月

Visual C++ 的功能和向导简化了生成多平台设备应用程序、配置文件和项目文件的大多数常见任务。此演练描述由 Windows 32 设备应用程序向导自动生成的代码。以此方式，您可以根据需要扩展和修改 Windows 应用程序。

向导生成的 Windows 32 设备应用程序的代码

如果您熟悉 Windows (win32) 桌面编程，则可以很容易识别出向导生成的主例程。

在典型的 Windows 设备应用程序中，主入口点位于 <yourprojectname>.cpp 文件中。下文给出了此文件的示例。

粗略的来看，应用程序具有以下主要函数：

WinMain 函数
MyRegisterClass 函数
InitInstance 函数
About Dialog 函数

下面的示例对上述每个函数进行了阐释：

WinMain 函数：int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)。有关更多信息，请参见 WinMain 函数。

int WINAPI WinMain(HINSTANCE hInstance,
                HINSTANCE hPrevInstance,
                LPTSTR    lpCmdLine,
                int       nCmdShow)
{
      MSG msg;

      // Perform application initialization:
      if (!InitInstance(hInstance, nCmdShow)) 
      {
            return FALSE;
      }

Win32 平台。有关更多信息，请参见 Win32 Platforms。

#ifndef WIN32_PLATFORM_WFSP
        HACCEL hAccelTable;
        hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_WIN32SMARTDEVICE);
#endif // !WIN32_PLATFORM_WFSP

消息循环。有关更多信息，请参见 Message Handling and Command Targets。

        // Main message loop:
        while (GetMessage(&msg, NULL, 0, 0)) 
        {
#ifndef WIN32_PLATFORM_WFSP
            if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) 
#endif // !WIN32_PLATFORM_WFSP
            {
                  TranslateMessage(&msg);
                  DispatchMessage(&msg);
            }
      }

      return (int) msg.wParam;
}

MyRegisterClass 函数用于注册该窗口应用程序。

//  FUNCTION: MyRegisterClass()
ATOM MyRegisterClass(HINSTANCE hInstance, LPTSTR szWindowClass)
{
      WNDCLASS wc;

      wc.style         = CS_HREDRAW | CS_VREDRAW;
      wc.lpfnWndProc   = (WNDPROC)WndProc;
      wc.cbClsExtra    = 0;
      wc.cbWndExtra    = 0;
      wc.hInstance     = hInstance;
      wc.hIcon         = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WIN32SMARTDEVICE));
      wc.hCursor       = 0;
      wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
      wc.lpszMenuName  = 0;
      wc.lpszClassName = szWindowClass;

      return RegisterClass(&wc);
}

InitInstance：FUNCTION InitInstance(HANDLE, int)。有关更多信息，请参见 InitInstance Member Function。

WIN32_PLATFORM_WFSP 用作 Smartphone 的条件，WIN32_PLATFORM_PSPC 用作 Pocket PC 的条件。如果需要进一步区分，可以随时定义自己的条件。

// FUNCTION: InitInstance(HANDLE, int)
// PURPOSE: Saves instance handle and creates main window.
// COMMENTS:
// In this function, we save the instance handle in a global 
// variable and create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    HWND hWnd;
    TCHAR szTitle[MAX_LOADSTRING];        
// title bar text
    TCHAR szWindowClass[MAX_LOADSTRING];  
// main window class name

    g_hInst = hInstance; 
// Store instance handle in your global variable.

#ifdef WIN32_PLATFORM_PSPC
    // SHInitExtraControls should be called once during your application's initialization to initialize any
    // of the Pocket PC special controls such as CAPEDIT and SIPPREF.
    SHInitExtraControls();
#endif // WIN32_PLATFORM_PSPC

    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); 
    LoadString(hInstance, IDC_WIN32SMARTDEVICE, szWindowClass, MAX_LOADSTRING);

#if defined(WIN32_PLATFORM_PSPC) || defined(WIN32_PLATFORM_WFSP)
    //If it is already running, then focus on the window, and exit.
    hWnd = FindWindow(szWindowClass, szTitle);  
    if (hWnd) 
    {
        // Set the focus to the foremost child window.
        // The "| 0x00000001" is used to bring any owned windows
        //to the foreground and activate them.
        SetForegroundWindow((HWND)((ULONG) hWnd | 0x00000001));
        return 0;
    } 
#endif // WIN32_PLATFORM_PSPC || WIN32_PLATFORM_WFSP

    if (!MyRegisterClass(hInstance, szWindowClass))
    {
      return FALSE;
    }

    hWnd = CreateWindow(szWindowClass, szTitle, WS_VISIBLE,
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);

    if (!hWnd)
    {
        return FALSE;
    }

#ifdef WIN32_PLATFORM_PSPC
    // When the main window is created using CW_USEDEFAULT, 
    // the height of the menubar is not taken into account. 
    // So the generated code resizes the window after creating it.
    if (g_hWndMenuBar)
    {
        RECT rc;
        RECT rcMenuBar;

        GetWindowRect(hWnd, &rc);
        GetWindowRect(g_hWndMenuBar, &rcMenuBar);
        rc.bottom -= (rcMenuBar.bottom - rcMenuBar.top);

        MoveWindow(hWnd, rc.left, rc.top, rc.right-rc.left, rc.bottom-rc.top, FALSE);
    }
#endif // WIN32_PLATFORM_PSPC

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);


    return TRUE;
}

还将为应用程序生成一个“关于”对话框，作为指导您生成可能需要的其他对话框的示例：LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)

// win32smartdevice.cpp : Defines the entry point for the application.
#include "stdafx.h"
#include "win32smartdevice.h"
#include <windows.h>
#include <commctrl.h>

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE               g_hInst;                
// Current instance:
HWND                    g_hWndMenuBar;          
// Menu bar handle

// Forward declarations of functions included in this code module:
ATOM              MyRegisterClass(HINSTANCE, LPTSTR);
BOOL              InitInstance(HINSTANCE, int);
LRESULT CALLBACK  WndProc(HWND, UINT, WPARAM, LPARAM);
#ifndef WIN32_PLATFORM_WFSP
LRESULT CALLBACK  About(HWND, UINT, WPARAM, LPARAM);
#endif 
// !WIN32_PLATFORM_WFSP
//  FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//  PURPOSE:  Processes messages for the main window.
//  WM_COMMAND    - process the application menu
//  WM_PAINT      - Paint the main window
//  WM_DESTROY    - post a quit message and return

一些主消息（如 WM_COMMAND）已包含在内，以便供您使用或者提供可扩展性。包含 WinProc 的目的是处理系统及用户输入消息：LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)。有关 WinProc 的更多信息，请参见 Windows 概述。

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;
        HGDIOBJ  hbrWhite, hbrGray; 
        POINT aptStar[6] = {50,2, 2,98, 98,33, 2,33, 98,98, 50,2}; 

#if defined(SHELL_AYGSHELL) && !defined(WIN32_PLATFORM_WFSP)
    static SHACTIVATEINFO s_sai;
#endif // SHELL_AYGSHELL && !WIN32_PLATFORM_WFSP
    switch (message) 
    {
        case WM_COMMAND:
            wmId    = LOWORD(wParam); 
            wmEvent = HIWORD(wParam); 
            // Parse the menu selections:
            switch (wmId)
            {
#ifndef WIN32_PLATFORM_WFSP
                case IDM_HELP_ABOUT:
                    DialogBox(g_hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
                    break;
#endif // !WIN32_PLATFORM_WFSP
#ifdef WIN32_PLATFORM_WFSP
                case IDM_OK:
                    DestroyWindow(hWnd);
                    break;
#endif // WIN32_PLATFORM_WFSP
#ifndef WIN32_PLATFORM_WFSP
                case IDM_OK:
                    SendMessage (hWnd, WM_CLOSE, 0, 0);                       
                    break;
#endif // !WIN32_PLATFORM_WFSP
                default:
                    return DefWindowProc(hWnd, message, wParam, lParam);
            }
            break;
        case WM_CREATE:
#ifdef SHELL_AYGSHELL
            SHMENUBARINFO mbi;

            memset(&mbi, 0, sizeof(SHMENUBARINFO));
            mbi.cbSize     = sizeof(SHMENUBARINFO);
            mbi.hwndParent = hWnd;
            mbi.nToolBarId = IDR_MENU;
            mbi.hInstRes   = g_hInst;

            if (!SHCreateMenuBar(&mbi)) 
            {
                g_hWndMenuBar = NULL;
            }
            else
            {
                g_hWndMenuBar = mbi.hwndMB;
            }

#ifndef WIN32_PLATFORM_WFSP
            // Initialize the shell activate info structure
            memset(&s_sai, 0, sizeof (s_sai));
            s_sai.cbSize = sizeof (s_sai);
#endif // !WIN32_PLATFORM_WFSP
#endif // SHELL_AYGSHELL
      hbrWhite = GetStockObject(WHITE_BRUSH); 
        hbrGray  = GetStockObject(GRAY_BRUSH); 
        return 0L; 
break;
        case WM_PAINT:
         RECT  rc;
       hdc = BeginPaint(hWnd, &ps); 
       GetClientRect(hWnd, &rc); 
       Polyline(hdc, aptStar, 6); 
       EndPaint(hWnd, &ps); 
       return 0L; 

            break;
        case WM_DESTROY:
#ifdef SHELL_AYGSHELL
            CommandBar_Destroy(g_hWndMenuBar);
#endif // SHELL_AYGSHELL
            PostQuitMessage(0);
            break;

#if defined(SHELL_AYGSHELL) && !defined(WIN32_PLATFORM_WFSP)
        case WM_ACTIVATE:
            // Notify shell of your activate message.
            SHHandleWMActivate(hWnd, wParam, lParam, &s_sai, FALSE);
            break;
        case WM_SETTINGCHANGE:
            SHHandleWMSettingChange(hWnd, wParam, lParam, &s_sai);
            break;
#endif // SHELL_AYGSHELL && !WIN32_PLATFORM_WFSP

        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

#ifndef WIN32_PLATFORM_WFSP
// Message handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
        case WM_INITDIALOG:
#ifdef SHELL_AYGSHELL
            {
                // Create a Done button and size it.  
                SHINITDLGINFO shidi;
                shidi.dwMask = SHIDIM_FLAGS;
                shidi.dwFlags = SHIDIF_DONEBUTTON | SHIDIF_SIPDOWN | SHIDIF_SIZEDLGFULLSCREEN | SHIDIF_EMPTYMENU;
                shidi.hDlg = hDlg;
                SHInitDialog(&shidi);
            }
#endif // SHELL_AYGSHELL

            return TRUE;

        case WM_COMMAND:
#ifdef SHELL_AYGSHELL
            if (LOWORD(wParam) == IDOK)
#endif
            {
                EndDialog(hDlg, LOWORD(wParam));
                return TRUE;
            }
            break;

        case WM_CLOSE:
            EndDialog(hDlg, message);
            return TRUE;

#ifdef _DEVICE_RESOLUTION_AWARE
        case WM_SIZE:
            {
            DRA::RelayoutDialog(
                  g_hInst, 
                  hDlg, 
                  DRA::GetDisplayMode() != DRA::Portrait ? MAKEINTRESOURCE(IDD_ABOUTBOX_WIDE) : MAKEINTRESOURCE(IDD_ABOUTBOX));
            }
            break;
#endif
    }
    return FALSE;
}
#endif // !WIN32_PLATFORM_WFSP

通过

代码解释：Visual C++ 设备项目中由向导生成的代码

向导生成的 Windows 32 设备应用程序的代码

请参见

参考

其他资源

其他资源