SetViewportOrg und MoveTo undeclared

[silvanm]

Hallo,

Ich habe ein ein Problem im Cpp. Da ich mit WinApi noch recht Anfänger bin habe ich im Internet einen Kurs gefunden mit dem man eine Rosette zeichnen sollte. Es verschiebt das Kordinatennetz des Fensters in die Mitte und verteilt auf einem imaginären Kreis 25 Punkte, die dann mit MoveTo und LineTo alle miteinander verbunden werden. So sollte durch die 600 Linien eine Rosette entstehen. Leider gibt mir der Compiler aber immer folgende zwei Fehlermeldungen aus:

93 SetViewportOrg undeclared (first use this function)
105 MoveTo undeclared (first use this function)

Ich verwende folgenden Quellcode:

#include <math.h>
#include <windows.h>

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

/*  Make the class name into a global variable  */
char szClassName[ ] = "WindowsApp";

int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

{
HWND hwnd;               /* This is the handle for our window */
MSG messages;            /* Here messages to the application are saved */
WNDCLASSEX wincl;        /* Data structure for the windowclass */

    /* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
wincl.style = CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW;  /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);

    /* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL;                 /* No menu */
wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
wincl.cbWndExtra = 0;                      /* structure or the window instance */
    /* Use Windows's default color as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

    /* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
   return 0;

    /* The class is registered, let's create the program*/
    hwnd = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName,         /* Classname */
           "Windows App",       /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           CW_USEDEFAULT,       /* Windows decides the position */
           CW_USEDEFAULT,       /* where the window ends up on the screen */
           544,                 /* The programs width */
           375,                 /* and height in pixels */
           HWND_DESKTOP,        /* The window is a child-window to desktop */
           NULL,                /* No menu */
           hThisInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */
           );

    /* Make the window visible on the screen */
ShowWindow (hwnd, nFunsterStil);
UpdateWindow (hwnd);  

    /* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
        /* Translate virtual-key messages into character messages */
        TranslateMessage(&messages);
        /* Send message to WindowProcedure */
        DispatchMessage(&messages);
    }

    /* The program return-value is 0 - The value that PostQuitMessage() gave */
    return messages.wParam;
}


/*  This function is called by the Windows function DispatchMessage()  */

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{HDC hdc;
PAINTSTRUCT ps;
static int cxClient , cyClient , nPoints = 25 ; /* .. Kommentar am Ende */
double Radius , dPhi ; /* .. Radius des Kreises, Winkel-Schritte */
int i , j , xs , ys ;

    switch (message)                  /* handle the messages */
    {
    case WM_SIZE : /* ... siehe Kommentar am Ende */
    cxClient = LOWORD (lParam) ; /* .. sind die Abmessungen des */
    cyClient = HIWORD (lParam) ; /* Zeichen-Fensters (Pixel) */
    return 0 ;
    
    case WM_PAINT:
         hdc = BeginPaint (hwnd, &ps);
         SetViewportOrg (hdc, cxClient / 2 , cyClient / 2);
         /* .. legt Ursprung des Koordinatensystems in Fenstermitte */
         Radius = ((cxClient > cyClient) ? cyClient : cxClient) *.45 ;
         dPhi = atan (1.) * 8. / nPoints ; /* pi * 2 / nPoints */
         for (i = 0 ; i < nPoints ; i++)
         {
         xs = (int) (Radius * cos (dPhi * i) + .5) ;
         ys = (int) (Radius * sin (dPhi * i) + .5) ;
         for (j = 0 ; j < nPoints ; j++) /* Achtung! Die GDI- */
         { /* Funktionen verwen- */
         if (j != i) /* den ausschliesslich */
         { /* Integer-Koordinaten */
         MoveTo (hdc , xs , ys) ;
         LineTo (hdc ,
         (int) (Radius * cos (dPhi * j) + .5) ,
         (int) (Radius * sin (dPhi * j) + .5)) ;
         /* ... werden am Programm-Ende beschrieben */
         }
         }
         }

         
         
         EndPaint (hwnd, &ps) ;
         return 0 ;
    
    case WM_DESTROY:
         PostQuitMessage (0);
         return 0;
    }

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

Weiss jemand von euch was ich falsch mache? Ich habe keine Ahnung!

Ich verwende Windows Vista Home Premium.

Ich bin über jeden Post dankbar