CALLBACK replaces far pascal in the CALLBACK routine of the application
HANDLE is a 32-bit unsigned integer used as a HANDLE.
HDC device description handle
HWND a 32-bit unsigned integer used as a window handle
LONG a 32-bit signed integer
LPARAM is used to declare the type of lParam
Similar to LPSTR, but used for read-only string pointers
LPSTR a 32-bit pointer
A normal LPVIOD pointer type is equivalent to (viod *)
Return Value of the LRESULT subwindow Process
NULL is the zero value of an integer. It is often used to activate the default actions and parameters of a function.
UINT is an unsigned integer type. Its size depends on the host environment. It is 32-bit in NT.
WCHAR is a 16-bit UNICODE character used to represent symbols of all languages in the world.
WINAPI replaces far pascal in API Definition
WPARAM Statement on wParam Common Win32 application Structures Structure Description
-----------------------------------------------
MSG defines the input message domain
PAINTSTRUCT defines the drawing structure used for drawing in a window
RECT defines a rectangle
WNDCLASS defines a window class Example: # Include
Lresult callback WndProc (HWND, UINT, WPARAM, LPARAM );
Char szProgName [] = "ProgName ";
Int WINAPI WinMain (HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR lpCmdline, int nCmdShow)
File: // Winmain() Is the start and end of the application. It is mainly responsible for registering the window type of the application; executing the necessary initialization process; Creating and initializing the message loop of the application (used to receive the message queue of the program); ending the program, generally, when the WM_QUIT message is accepted.
File: //WINDOWS passes four parameters to WINMAIN:
File: // Parameter1 hInst: indicates the instance handle. When an application runs in WINDOWS, this number identifies the application.
File: // ParameterNumber 2 hPrevInst: it will always be a NULL value, indicating that other instances without this application are running.
File: // ParameterNumber 3 (lpCmdline:
File: // ParameterNumber 4 nCmdShow:
{
HWND hWnd;
MSG lpMsg;
WNDCLASS wcApp;
WcApp. lpszClassName = szProgName;
WcApp. hInstance = hInst;
WcApp. lpfnWndProc = WndProc;
WcApp. hCursor = LoadCursor (NULL, IDC_ARROW );
WcApp. hIcon = 0;
WcApp. lpszMenuName = 0;
WcApp. hbrBackground = GetStockObject (WHITE_BRUSH );
WcApp. style = CS_HREDRAW | CS_VREDRAW;
WcApp. cbClsExtra = 0;
WcApp. cbWndExtra = 0;
If (! RegisterClass (& wcApp ))
Return 0;
HWnd = CreateWindow (szProgName, "This is an example ",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
(HWND) NULL,
(HMENU) NULL,
(HANDLE) hInst,
(LPSTR) NULL );
ShowWindow (hWnd, nCmdShow );
UpdateWindow (hWnd );
While (GetMessage (& lpMsg, 0, 0 )){
TranslateMessage (& lpMsg );
DispatchMessage (& lpMsg );
}
Return (lpMsg. wParam );
}
Lresult callback WndProc (HWND hWnd, UINT messg, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
Switch (messg)
{
Case WM_PAINT:
Hdc = BeginPaint (hWnd, & ps );
MoveToEx (hdc, 0, 0, NULL );
LineTo (hdc, 639,429 );
MoveToEx (hdc, 639,0, NULL );
LineTo (hdc, 0,429 );
TextOut (hdc, 120,30, "some lines", 6 );
Chord (hdc, clerk, 20, clerk, 80, 455, 25, clerk, 70 );
TextOut (hdc, "arc", 4 );
Pie (hdc, 400,150,300, 50,300,100 );
TextOut (hdc, 350,50, "Pie Chart", 4 );
Ellipse (hdc 100,100,400,400 );
Ellipse (hdc 249,249,251,251 );
TextOut (hdc, 250,250, "center", 4 );
Rectangle (hdc, 50,300,150,400 );
ValidateRect (hWnd, NULL );
EndPaint (hWnd, & ps );
Break;
Case WM_DESTROY:
PostQuitMessage (0 );
Break;
Default:
Return (DefWindowProc (hWnd, messg, wParam, lParam ));
Break;
}
Return 0;
} |
