如何用CodeLite寫win32窗體程序（一）

當然，使用界面庫是可以寫窗體程序的，但如果不使用界面庫呢，如何寫win32窗體程序呢？

#include <windows.h>
#include <stdio.h>

HINSTANCE g_hInst = NULL;//定義全局靜態變量，不會和別的cpp文件中的同名變量衝突
HWND txtInput1;
HWND txtInput2;
HWND chkSel[4];
HWND cmdStart;
HWND txtOutput;

//消息處理函數，每個窗體都有一個，如果寫在WinMain後面，則要先聲明
LRESULT CALLBACK WndProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
   switch(Message)
   {
      case WM_CLOSE:
         DestroyWindow(hwnd);
      break;

      case WM_DESTROY:
         PostQuitMessage(0);
      break;

      case WM_CREATE://創建主窗口時在上面創建輸入框和按鈕控件
		txtInput1 = CreateWindowEx(WS_EX_CLIENTEDGE,"Edit","",WS_CHILD|WS_VISIBLE,10,10,100,20,hwnd,NULL,g_hInst,0);
		txtInput2=CreateWindowEx(WS_EX_CLIENTEDGE,"Edit","",WS_CHILD|WS_VISIBLE,10,40,100,20,hwnd,NULL,g_hInst,0);
		chkSel[0]=CreateWindowEx(0,"Button","+",WS_CHILD|WS_VISIBLE|BS_AUTORADIOBUTTON,10,70,35,20,hwnd,NULL,g_hInst,0);
		chkSel[1]=CreateWindowEx(0,"Button","-",WS_CHILD|WS_VISIBLE|BS_AUTORADIOBUTTON,50,70,35,20,hwnd,NULL,g_hInst,0);
		chkSel[2]=CreateWindowEx(0,"Button","*",WS_CHILD|WS_VISIBLE|BS_AUTORADIOBUTTON,90,70,35,20,hwnd,NULL,g_hInst,0);
		chkSel[3]=CreateWindowEx(0,"Button","/",WS_CHILD|WS_VISIBLE|BS_AUTORADIOBUTTON,130,70,35,20,hwnd,NULL,g_hInst,0);
		SendMessage(chkSel[0],BM_SETCHECK,1,0);//默認選中了“+”
		cmdStart=CreateWindowEx(0,"Button","開始計算",WS_CHILD|WS_VISIBLE,10,100,70,30,hwnd,NULL,g_hInst,0);
		txtOutput=CreateWindowEx(WS_EX_CLIENTEDGE,"Edit","",WS_CHILD|WS_VISIBLE,10,140,100,20,hwnd,NULL,g_hInst,0);
		break;

	  case WM_COMMAND:
		if((HWND)lParam==cmdStart)
		{//按了“開始計算”按鈕
			double n1,n2;
			double jg;
			char ts[100];

			GetWindowText(txtInput1,ts,sizeof(ts));
			n1=atof(ts);
			GetWindowText(txtInput2,ts,sizeof(ts));
			n2=atof(ts);
			if(SendMessage(chkSel[0],BM_GETCHECK,0,0))
			{
				jg=n1+n2;
			}
			else if(SendMessage(chkSel[1],BM_GETCHECK,0,0))
			{
				jg=n1-n2;
			}
			else if(SendMessage(chkSel[2],BM_GETCHECK,0,0))
			{
				jg=n1*n2;
			}
			else
			{
				jg=n1/n2;
			}
			snprintf(ts,sizeof(ts),"%g",jg);
			SetWindowText(txtOutput,ts);
		}
			
		break;

      default:
         //爲確保每一個消息都得到處理，調用默認的消息處理函數來處理其它消息
         return DefWindowProc(hwnd, Message, wParam, lParam);
   }
   return 0;
}

//Windows窗體程序主函數
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
   WNDCLASSEX WndClass;   //定義窗口類，有下面12種屬性
   HWND hwnd;             //定義HWND類型變量hwnd，其實HWND就是UINT類型
   MSG Msg;
   char const g_szClassName[] = "MyWindowClass";//因爲有兩個地方用到了類名

   g_hInst = hInstance;

   WndClass.cbSize        = sizeof(WNDCLASSEX);                 //類大小，可省略
   WndClass.style         = 0;
   WndClass.lpfnWndProc   = WndProc;                            //關聯消息處理函數，見下LRESULT CALLBACK WndProc()
   WndClass.cbClsExtra    = 0;
   WndClass.cbWndExtra    = 0;
   WndClass.hInstance     = g_hInst;
   WndClass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);    //圖標
   WndClass.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);    //可省略
   WndClass.hCursor       = LoadCursor(NULL, IDC_ARROW);        //光標
   WndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW);
   WndClass.lpszMenuName  = "MyWin";
   WndClass.lpszClassName = g_szClassName;

   if(!RegisterClassEx(&WndClass))    //如果註冊失敗，則顯示錯誤信息並退出
   {
      MessageBox(0, "Window Registration Failed!", "Error!",
         MB_ICONEXCLAMATION | MB_OK | MB_SYSTEMMODAL);
      return 0;
   }

   hwnd = CreateWindowEx(
      WS_EX_CLIENTEDGE,
      g_szClassName,
      "File Editor Example Program",//窗體名
      WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, CW_USEDEFAULT, 320, 240,
      NULL, NULL, g_hInst, NULL);

   if(hwnd == NULL)
   {
      MessageBox(0, "Window Creation Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK | MB_SYSTEMMODAL);
      return 0;
   }

   ShowWindow(hwnd, nCmdShow);
   UpdateWindow(hwnd);

   while(GetMessage(&Msg, NULL, 0, 0))   //從消息隊列中取消息
   {
      TranslateMessage(&Msg);    //轉換消息
      DispatchMessage(&Msg);     //派發消息，由這裏激活LRESULT CALLBACK WndProc()函數 
   }
   return Msg.wParam;
}

int main(int argc,char *argv[])
{
    FreeConsole();//釋放控制檯
    WinMain(GetModuleHandle(NULL),NULL,GetCommandLine(),5);
    return 1;
}

這樣就可以利用win32提供的API來寫窗體程序了，只是程序運行前，會有一個控制檯窗口一閃而過，但這個問題可以通過最小化運行來解決。

==============================================================================

2019-04-03解決運行時CMD窗口閃一下的問題，參考網址：https://www.cnblogs.com/elitiwin/p/5341304.html

那就是右擊codelite中的本項目，點設置，在鏈接器選項中，加入 -Wl,--subsystem,windows 即可，這樣的話這句Freeconsole();不需要有了。或者加參數-mwindows，效果也是一樣的。