#include <windows.h>

#define LINIE      1

HWND bPixel;
/*  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;                 /* 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);

     bPixel      = CreateWindow("button", "Pixel", WS_CHILD | WS_VISIBLE |
                               BS_DEFPUSHBUTTON, 310, 0, 80, 30,
                               hWnd, (HMENU)PIXEL, hInstance, NULL);

    /* 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)
{
    switch (message)                  /* handle the messages */
    {            
         case WM_CLOSE:
            DestroyWindow(hwnd);
            return 0;
        case WM_PAINT:
            PAINTSTRUCT ps;
            HDC hdc;
            hdc = BeginPaint (hwnd, &ps);
            SetTextColor( hdc, RGB( 255,   0,  0) );  // rot
            SetBkColor  ( hdc, RGB( 255, 255,  0) );  // gelb
            TextOut     ( hdc, 20, 20, "Ich bin ein Fenster.", 20);
            EndPaint (hwnd, &ps); 
            return 0;
        case WM_DESTROY:
            PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
            break;
        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
    }

    return 0;
}

Dies war der versuch oben ein inputfeld hinzusetzen und unten mit der pixel malen zu können die dort hingesetzt werden wo sich halt die maus befindet (int X,Y;)

Compiler: Default compiler
Building Makefile: "C:\Dev-Cpp\Makefile.win"
Executing make...
make.exe -f "C:\Dev-Cpp\Makefile.win" all
g++.exe -c main.cpp -o main.o -I"C:/Dev-Cpp/lib/gcc/mingw32/3.4.2/include" -I"C:/Dev-Cpp/include/c++/3.4.2/backward" -I"C:/Dev-Cpp/include/c++/3.4.2/mingw32" -I"C:/Dev-Cpp/include/c++/3.4.2" -I"C:/Dev-Cpp/include"

main.cpp: In function int WinMain(HINSTANCE__*, HINSTANCE__*, CHAR*, int)': main.cpp:63: error:hWnd' undeclared (first use this function)
main.cpp:63: error: (Each undeclared identifier is reported only once for each function it appears in.)
main.cpp:63: error: PIXEL' undeclared (first use this function) main.cpp:63: error:hInstance' undeclared (first use this function)

make.exe: *** [main.o] Error 1

Execution terminated

Ich wäre für eure hilfe dankbar

Er findet die Resource PIXEL nicht, demnach die Resourcen nicht richtig eingebunden.

In der WinMain heisst es bei dir hThisInstance, bei CreateWindow() gibts du aber hInstance an.

Bei hWnd bei CreateWindow() in Zeile 63 Groß/Kleinschreibung beachten!

Er findet die Resource PIXEL nicht, demnach die Resourcen nicht richtig eingebunden.

In der WinMain heisst es bei dir hThisInstance, bei CreateWindow() gibts du aber hInstance an.

Fehler 1 und 3 sind korrigiert. Danke.

Das mit der Resource verstehe ich nicht (den code teil habe ich aus dem i net)

... deswegen kopiert man nicht einfach Code ...