hello world 程序优化

这样使添加处理消息函数变得简单

步骤1： 头文件中添加相关项

步骤2： cpp添加具体实现方法

步骤3： 结构体数组中添加相关项

.h 文件：

struct DecodeUint{
 UINT meesage;
 LONG (*fun)(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
};

#define dim(x) (sizeof(x)/sizeof(x[0]))

LONG OnDestory(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
LONG OnPaint(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

.c文件：

#include <Windows.h>#include "Border.h"


struct DecodeUint MainMessageProc[] = {
 WM_DESTROY,OnDestory,
 WM_PAINT,OnPaint,
};

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

int WinMain(HINSTANCE hInstance,
   HINSTANCE hPrevInstance,
   LPTSTR    lpCmdLine,
   int       nCmdShow)
{

 WNDCLASS wc;

 wc.cbClsExtra    = 0;
 wc.cbWndExtra    = 0;
 wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
 wc.hCursor       = NULL;
 wc.hIcon         = NULL;
 wc.hInstance     = hInstance;
 wc.lpfnWndProc   = WndProc;
 wc.lpszClassName = TEXT("hello");
 wc.lpszMenuName  = NULL;
 wc.style         = CS_HREDRAW | CS_VREDRAW;


 if (!RegisterClass(&wc)) return -1;


 HWND hWnd = CreateWindow(TEXT("hello"),TEXT("helloworld"), WS_VISIBLE | WS_BORDER | WS_SYSMENU | WS_MAXIMIZEBOX | WS_MINIMIZEBOX | WS_CAPTION,
  10,10,320,240,NULL,NULL,hInstance,NULL);


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

 MSG msg;

 while (GetMessage(&msg, NULL, 0, 0))
 {
  TranslateMessage(&msg);
  DispatchMessage(&msg);
 }

 return 1;
}

LONG OnDestory(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 PostQuitMessage(1);
 return TRUE;
}

LONG OnPaint(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 PAINTSTRUCT ps;
 HDC hdc;
 RECT rect;

 GetClientRect(hWnd,&rect);
 hdc = BeginPaint(hWnd,&ps);
 DrawText(hdc,TEXT("hello world"),-1,&rect,DT_VCENTER | DT_CENTER);
 EndPaint(hWnd,&ps);

 return TRUE;
}


LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{

 for (int i = 0;i < dim(MainMessageProc); i++)
 {
  if (MainMessageProc[i].meesage == message)
  {
   (*MainMessageProc[i].fun)(hWnd,message,wParam,lParam);
  }
 }

 return DefWindowProc(hWnd,message,wParam,lParam);
}