应用程序框架的模型

最新推荐文章于 2024-03-26 09:30:00 发布

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#框架 #pascal #null #function #application #class

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本文详细介绍了基于WinMain.cpp的应用程序框架模型，包括窗口句柄、窗体类名称的定义，以及初始化、运行和关闭应用程序的主要流程。通过具体代码示例展示了如何创建窗口类、注册窗口、显示窗口并进行消息循环。

/**************************************************
WinMain.cpp
应用程序框架的模型
**************************************************/

// Include files
#include <windows.h>
#include <stdio.h>

// Window handles, class and caption text 声明WINDOWS句柄和窗体类的标题类名等
HWND          g_hWnd;
HINSTANCE     g_hInst;
static char   g_szClass[]   = "ShellClass";
static char   g_szCaption[] = "Shell Application";

// Function prototypes
int PASCAL WinMain(HINSTANCE hInst, HINSTANCE hPrev,          /
                   LPSTR szCmdLine, int nCmdShow);
long FAR PASCAL WindowProc(HWND hWnd, UINT uMsg,              /
                           WPARAM wParam, LPARAM lParam);

BOOL DoInit(); //声明初始化函数
BOOL DoShutdown();//声明退出函数
BOOL DoFrame();//声明主框架函数

int PASCAL WinMain(HINSTANCE hInst, HINSTANCE hPrev,          /
                   LPSTR szCmdLine, int nCmdShow)
{
WNDCLASSEX wcex;
MSG        Msg;

g_hInst = hInst;

// Create the window class here and register it
//设置窗体与注册窗体
wcex.cbSize        = sizeof(wcex);
wcex.style         = CS_CLASSDC;
wcex.lpfnWndProc   = WindowProc;
wcex.cbClsExtra    = 0;
wcex.cbWndExtra    = 0;
wcex.hInstance     = hInst;
wcex.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
wcex.hCursor       = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = NULL;
wcex.lpszMenuName = NULL;
wcex.lpszClassName = g_szClass;
wcex.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&wcex))
    return FALSE;
//建立窗体
// Create the Main Window
g_hWnd = CreateWindow(g_szClass, g_szCaption,
        WS_CAPTION | WS_SYSMENU,
        0, 0, 400, 400,
        NULL, NULL,
        hInst, NULL );
if(!g_hWnd)
    return FALSE;
//显示与更新窗体
ShowWindow(g_hWnd, SW_NORMAL);
UpdateWindow(g_hWnd);

// Run init function and return on error
if(DoInit() == FALSE)
return FALSE;

// Start message pump, waiting for signal to quit
ZeroMemory(&Msg, sizeof(MSG));   //ZeroMemory 宏为填充一内存块为零
//&Msg :starting address of the block of memory to fill with zeros sizeof(MSG):长度
//消息循环
while(Msg.message != WM_QUIT) {
    if(PeekMessage(&Msg, NULL, 0, 0, PM_REMOVE)) {
      TranslateMessage(&Msg);
      DispatchMessage(&Msg);
    }
//调用框架函数
    if(DoFrame() == FALSE)
      break;
}

// Run shutdown function
DoShutdown();

//The UnregisterClass function unregisters a window class, freeing the memory required for the class.
//窗体类的类名，窗口句柄
UnregisterClass(g_szClass, hInst);

return Msg.wParam;
}

//回调函数
long FAR PASCAL WindowProc(HWND hWnd, UINT uMsg,              /
                           WPARAM wParam, LPARAM lParam)
{
switch(uMsg) {
    case WM_DESTROY:
      PostQuitMessage(0); //退出窗口消息
      return 0;

}

//返回默认消息处理
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}

BOOL DoInit()
{
return TRUE;
}

BOOL DoShutdown()
{
return TRUE;
}

BOOL DoFrame()
{
return TRUE;
}