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#include <windows.h> // The underlying implementation window   The header file 

//6 Process window 

//CALLBACK  representative __stdcall  The order in which parameters are passed ： From right to left   To stack , And before the function returns   Empty stack 
LRESULT CALLBACK WindowProc(
	HWND hwnd, // The window handle to which the message belongs 
	UINT uMsg, // Specific message name  WM_XXXX  Message name 
	WPARAM wParam, // Keyboard additional messages 
	LPARAM lParam  // Mouse attached message 
	)
{
    
	switch (uMsg)
	{
    
	case WM_CLOSE:
		// all xxxWindow The way to end  , Will not enter the message queue , I'm going to do it directly 
		DestroyWindow(hwnd); //DestroyWindow  Send another message  WM_DESTROY
		break;
	case  WM_DESTROY:
		PostQuitMessage(0);
		break;
	case WM_LBUTTONDOWN: // Press the left mouse button 
			{
    
			int xPos = LOWORD(lParam);
			int yPos = HIWORD(lParam);

			char buf[1024];
			wsprintf(buf,TEXT("x = %d,y = %d"), xPos, yPos);

			MessageBox(hwnd, buf, TEXT(" Press the left mouse button "), MB_OK);

			break;
			}
	case WM_KEYDOWN: // keyboard 
		MessageBox(hwnd, TEXT(" Press the keyboard "), TEXT(" Press the keyboard "), MB_OK);
		break;

	case WM_PAINT: // mapping 
		{
    
			PAINTSTRUCT ps; // Drawing structure 
			HDC hdc = BeginPaint(hwnd, &ps);

			TextOut(hdc, 100, 100, TEXT("HELLO"), strlen("HELLO"));

			EndPaint(hwnd, &ps);
		}

		break;
	}

	


	// The default processing method is used for the return value 
	return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

// Program entry function 

//WINAPI  representative __stdcall  The order in which parameters are passed ： From right to left   To stack , And before the function returns   Empty stack 
int WINAPI WinMain(
	HINSTANCE hInstance,  // Application instance handle  
	HINSTANCE hPrevInstance, // Last application handle , stay win32 In the environment , The parameter is generally NULL, It doesn't work 
	LPSTR lpCmdLine, //char * argv[] 
	int nShowCmd) // Show command   Maximize 、 To minimize the   normal 
{
    

	//1、 Design window 
	//2、 Registration window 
	//3、 create a window 
	//4、 Display and update 
	//5、 Get message through loop 
	//6、 Process the message  （ Window procedure ）

	//1、 Design window 
	WNDCLASS wc;
	wc.cbClsExtra = 0; // Class  
	wc.cbWndExtra = 0; // Extra memory for Windows 
	wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); // Set the background 
	wc.hCursor = LoadCursor(NULL, IDC_HAND); // Set the cursor   If the first parameter is NULL, Represents using the cursor provided by the system 
	wc.hIcon = LoadIcon(NULL, IDI_ERROR); // Icon   If the first parameter is NULL, Represents using the cursor provided by the system 
	wc.hInstance = hInstance;  // Application instance handle   Pass in WinMain The formal parameter in the 
	wc.lpfnWndProc = WindowProc;  // Callback function   Window procedure 
	wc.lpszClassName = TEXT("WIN"); // Specify the window class name 
	wc.lpszMenuName = NULL; // Menu name 
	wc.style = 0; // Display style  0 Represents the default style 

	//2、 Register window class 
	RegisterClass(&wc);

	//3、 create a window 
	/* lpClassName,  Class name  lpWindowName,  Title name  dwStyle, WS_OVERLAPPEDWINDOW  style  x,  Show coordinates  CW_USEDEFAULT  The default value is  y, nWidth,  Wide and high  nHeight, hWndParent,  The parent window  NULL hMenu,  menu  NULL hInstance,  Instance handle  hInstance lpParam)  Added value  NULL */

	HWND hwnd = CreateWindow(wc.lpszClassName, TEXT("WINDOWS"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);

	//4、  Display and update 
	ShowWindow(hwnd, SW_SHOWNORMAL);
	UpdateWindow(hwnd);

	//5、  Get message through loop 
	/* HWND hwnd;  Main window handle  UINT message;  Specific message name  WPARAM wParam;  Additional messages   Keyboard messages  LPARAM lParam;  Additional messages   Mouse message  DWORD time;  Message generation time  POINT pt;  Additional messages   Mouse message  x y */
	MSG msg;

	while (GetMessage(&msg, NULL, 0, 0))
	{
    
		/* _Out_ LPMSG lpMsg,  news  _In_opt_ HWND hWnd,  Capture window   fill NULL For capturing all windows  _In_ UINT wMsgFilterMin, // Minimum and maximum filtered messages   Generally fill in 0 _In_ UINT wMsgFilterMax) // fill 0 Capture all messages on behalf of  */
		//if (GetMessage(&msg, NULL, 0, 0) == FALSE)
		//{
    
		// break;
		//}

		// Translate the news 
		TranslateMessage(&msg);

		// Not for false
		// Distribution message 
		DispatchMessage(&msg);

	}

	
	


	return 0;
}

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