Resource file

hii have been reading a few tutorials and come to one where i have been taught to create a dialog box, but when i compiles it, a few errors came up:

Code:

 C:\Documents and Settings\Ross\My Documents\C++\Windows Programs\main.cpp In function `BOOL AboutDlgProc(HWND__*, unsigned int, unsigned int,  long int)': 

85 C:\Documents and Settings\Ross\My Documents\C++\Windows Programs\main.cpp `ID_HELP_ABOUT' undeclared (first use this function) 

88 C:\Documents and Settings\Ross\My Documents\C++\Windows Programs\main.cpp `IDD_ABOUT' undeclared (first use this function)

i know i have to declare them, but i don't know how, because i am relatively knew to windows programming, can anyone help me?

oh yeah, and here is the code:

Code:

//main.cpp
#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;                 /* 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);

    /* 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()  */

BOOL CALLBACK AboutDlgProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
        case WM_INITDIALOG:

        return TRUE;
        case WM_COMMAND:
            switch(LOWORD(wParam))
            {
                case ID_HELP_ABOUT:
                {
                   int ret = DialogBox(GetModuleHandle(NULL), 
                      MAKEINTRESOURCE(IDD_ABOUT), hwnd, AboutDlgProc);
                   if(ret == IDOK){
                      MessageBox(hwnd, "Dialog exited with IDOK.", "Notice",
                         MB_OK | MB_ICONINFORMATION);
               }
               else if(ret == IDCANCEL){
                   MessageBox(hwnd, "Dialog exited with IDCANCEL.", "Notice",
                       MB_OK | MB_ICONINFORMATION);
               }
               else if(ret == -1){
                   MessageBox(hwnd, "Dialog failed!", "Error",
                       MB_OK | MB_ICONINFORMATION);
               }
           }
           break;
           case IDOK:
              EndDialog(hwnd, IDOK);
           break;
           case IDCANCEL:
              EndDialog(hwnd, IDCANCEL);
           break;
            }
           break;
           default:
               return FALSE;
       }
       return TRUE;
}

oh, i forgot, i named the thread resource file because i was having problems with it, but i fixed those problems, so don't take any notice of the title of the thread.

Create a header file 'resource.h' and include it in main.cpp like so:

Code:

#include "resource.h"

Then, in your header, #define IDD_ABOUT and ID_HELP_ABOUT like so:

Code:

#define IDD_ABOUT     101
#define ID_HELP_ABOUT 102

Hope this helps.