Problems with Dialog Boxes

[Ezequias]

Hi fellows, I've just started programming with win32 API and I got a problem with the program below. Everytime it's executed it returns -1 value from the DialogBox function. The point I stop from the tutorial is
http://www.winprog.org/tutorial/dialogs.html

I will appreciate any tip.

Embraces!

Ezequias Rocha




#include <windows.h>
#include "resource.h"



/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
BOOL CALLBACK AboutDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam);

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

/* Function Prototypes */

/* Defines */
#define SerialPort ("COM%d")


BOOL CALLBACK AboutDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
switch(Message)
{
case WM_INITDIALOG:
return TRUE;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDOK:
EndDialog(hwnd, IDOK);
break;
}
break;
default:
return FALSE;
}
return TRUE;
}


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(GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_TESCICON));
wincl.hIconSm = (HICON)LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_TESCICON), IMAGE_ICON, 16, 16, 0);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = MAKEINTRESOURCE(IDR_MYMENU);
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Color of the background of the window */
wincl.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);

/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
{
MessageBox(NULL, "Window Registration Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}

/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
"Flex Network Analyzer", /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
816, /* The programs width */
563, /* 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 */
);

if(hwnd == NULL)//Ckecking if the window creation is ok
{
MessageBox(NULL, "Window Creation Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}

/* 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() */

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
switch(Message)
{
case WM_COMMAND:
switch(LOWORD(wParam))
{
case ID_FILE_EXIT:
PostMessage(hwnd, WM_CLOSE, 0, 0);
break;
case ID_HELP_ABOUT:
{
int ret = DialogBox(GetModuleHandle(NULL),
MAKEINTRESOURCE(IDD_ABOUT), hwnd, AboutDlgProc);
break;
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;
}
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, Message, wParam, lParam);
}
return 0;
}




############## my .rc file is as follows: #####################


#include "resource.h"

IDI_TESCICON ICON "Tesc.ico"

IDR_MYMENU MENU
BEGIN
POPUP "&Arquivo"
BEGIN
MENUITEM "S&air", ID_FILE_EXIT
END
POPUP "&Ajuda"
BEGIN
MENUITEM "Sobre o &Flex Network Analyser...", ID_HELP_ABOUT
END
END

IDD_ABOUT DIALOG DISCARDABLE 0, 0, 239, 66
STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "My About Box"
FONT 8, "MS Sans Serif"
BEGIN
DEFPUSHBUTTON "OK",IDOK,174,18,50,14
PUSHBUTTON "Cancel",IDCANCEL,174,35,50,14
GROUPBOX "About this program...",IDC_STATIC,7,7,225,52
CTEXT "An example program showing how to use Dialog Boxes\r\n\r\nby theForger",
IDC_STATIC,16,18,144,33
END

[Null]

The code works fine for me. Are you sure that the resource file is compiled and linked with your program?

[Ezequias]

Hi Null,

Thanks a lot for replying my post.
I change my .rc file and the stuff worked. I simply added
#include <windows.h>
in the first line of it and the problem disappeared.

P.S.: I don't know why but, in my IDE (Dev-cpp 4.9.9.2) the text of any declaration of the type CTEXT (in resource file) MUST BE IN JUST ONE LINE. e.g., the declaration
CTEXT "An example program showing how to use Dialog Boxes\r\n\r\nby theForger",
IDC_STATIC,16,18,144,33
only will work in the form
CTEXT "An example program showing how to use Dialog Boxes\r\n\r\nby theForger", IDC_STATIC,16,18,144,33


Thanks.

Embraces!

Ezequias Rocha