Posts by WolfPack Page 28

WolfPack 491 Posting Virtuoso

19 Years Ago

Well I ran a piece of code under a debugger. The value I entered was 0.0000124568 but the value stored by the program which I saw using the debugger was 1.2456800000000001e-005. You can see an unnecessary '1' marked in red. Since this is a problem due to the representation of floating point decimal numbers in binary, the only way I see to get around it is to enter the double value as a char array and search for the decimal point in the array. But even then you will have to know the maximum length of a value that can be entered.

Software Development c

WolfPack 491 Posting Virtuoso

19 Years Ago

Re: Problem Creating Window

This part returns NULL.

hWnd = CreateWindowEx(	(DWORD)		dwExStyle,
								(LPCTSTR)	lpClassName,
								(LPCTSTR)	lpWindowName,
								(DWORD)		dwStyle,
								(int)		x,
								(int)		y,
								(int)		nWidth,
								(int)		nHeight,
								(HWND)		hWndParent,
								(HMENU)		hMenu,
								(HINSTANCE)	hProgInst,
    							(LPVOID)	lpParam);
		if ( hWnd == NULL )
		{
			MessageBox(NULL, "CreateWindow Returned NULL", "Error", MB_OK );
			return;
		}

Software Development c

WolfPack 491 Posting Virtuoso

19 Years Ago

Re: Need help writing this function

I'm probably missing some math aspect here, but couldn't you convert 4.33 to a string, find out what position the . is and have your answer?

I also think that this is the simplest and ,the most accurate, answer. Great solution. :idea:

Software Development c

WolfPack 491 Posting Virtuoso

19 Years Ago

Re: WIN32 GUI application - Problem popping up dialog box

I dont know what you are trying to do. But try replacing your main file with the one I have attached. It is a skeleton window procedure. It worked for me.No problems with menus or whatever.

main.cpp (7.59 KB)

/* This source has been formatted by an unregistered SourceFormatX */
/* If you want to remove this info, please register this shareware */
/* Please visit http://www.textrush.com to get more information    */

#include "resource.h"

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure( HWND, UINT, WPARAM, LPARAM );
LRESULT CALLBACK WindowProcedure2( HWND, UINT, WPARAM, LPARAM );
BOOL CALLBACK ToolDlgProc( HWND hwnd, UINT Message, WPARAM wParam, LPARAM
  						lParam );


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

HWND hDialog = NULL; //the handle for the dialog box

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

{
	HWND hwnd, hwnd2; /* 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 */
	 );

	wincl.lpszClassName = "wincl2";
	wincl.lpfnWndProc = WindowProcedure2; /* This function is called by windows */
	/* 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*/
	hwnd2 = CreateWindowEx( 0,  /* Extended possibilites for variation */
	"wincl2",  /* Classname */
	"Window No 2",  /* 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 );
	ShowWindow( hwnd2, nFunsterStil );
	// MessageBox(hwnd, "hello world!", "Example - messagebox", MB_OK);

	/* 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_LBUTTONDOWN:
			break;
		case WM_DESTROY:
			DestroyWindow( hDialog );
			PostQuitMessage( 0 ); /* send a WM_QUIT to the message queue */
			break;

		case WM_CREATE:
			{
				//creating the menu 
				HMENU hMenu, hSubMenu;
				hMenu = CreateMenu();
				hSubMenu = CreatePopupMenu();
				AppendMenu( hSubMenu, MF_STRING, ID_FILE_EXIT, "E&xit" );
				AppendMenu( hMenu, MF_STRING | MF_POPUP, ( UINT )hSubMenu, "&File" );
				hSubMenu = CreatePopupMenu();
				AppendMenu( hSubMenu, MF_STRING, ID_STUFF_GO, "&Go" );

				AppendMenu( hMenu, MF_STRING | MF_POPUP, ( UINT )hSubMenu, "&Stuff" );

				hSubMenu = CreatePopupMenu();
				AppendMenu( hSubMenu, MF_STRING, ID_STUFF_GO, "&About" );
				AppendMenu( hMenu, MF_STRING | MF_POPUP, ( UINT )hSubMenu, "&Help" );
				SetMenu( hwnd, hMenu );



				hDialog = CreateDialog( GetModuleHandle( NULL ), MAKEINTRESOURCE(
   						IDD_TOOLBAR ), hwnd, ToolDlgProc );
				if ( hDialog != NULL )
				{
					ShowWindow( hDialog, SW_SHOW );
				}
				else
				{
					MessageBox( hwnd, "CreateDialog returned NULL", "Warning!", MB_OK |
				MB_ICONINFORMATION );
				}
			}
			break;



		case WM_COMMAND:

			switch ( LOWORD( wParam )) //contains the ID of the control that sent message
			{

			case ID_FILE_EXIT:
				PostMessage( hwnd, WM_CLOSE, 0, 0 );
				break;
			case ID_STUFF_GO:
				{
					LPCSTR s = "hello";
					MessageBox( GetActiveWindow(), s, s, MB_OK );
					break;
				}
			case ID_HELP_ABOUT:
				break;


			}

		default:
			 /* for messages that we don't deal with */
			return DefWindowProc( hwnd, message, wParam, lParam );
	}

	return 0;
}

/**************************************************************************
 *                                                                        *
 **************************************************************************/
LRESULT CALLBACK WindowProcedure2( HWND hwnd, UINT message, WPARAM wParam,
 								LPARAM lParam )
{
	switch ( message ) /* handle the messages */
	{

		case WM_DESTROY:
			DestroyWindow( hwnd );
			//PostQuitMessage( 0 ); /* send a WM_QUIT to the message queue */
			break;

		case WM_CREATE:
			{
				MessageBox( hwnd, "created windows no2", "Message", MB_OK);
			}
			break;
	default:
			 /* for messages that we don't deal with */
			return DefWindowProc( hwnd, message, wParam, lParam );
	}

	return 0;
}



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;
			case IDCANCEL:
				EndDialog( hwnd, IDCANCEL );
				break;
			}
			break;

		default:
			return FALSE;
	}
	return TRUE;
}

/**************************************************************************
 *                                                                        *
 **************************************************************************/

BOOL CALLBACK ToolDlgProc( HWND hwnd, UINT Message, WPARAM wParam, LPARAM
  						lParam )
{
	switch ( Message )
	{
		case WM_INITDIALOG:
			return TRUE;
		case WM_COMMAND:
			switch ( LOWORD( wParam ))
			{
			case IDC_PRESS:
				MessageBox( hwnd, "Hi!", "This is a message", MB_OK | MB_ICONEXCLAMATION );
				break;
			case IDC_OTHER:
				MessageBox( hwnd, "Bye!", "This is also a message", MB_OK |
   			MB_ICONEXCLAMATION );
				break;
			}
			break;
		default:
			return FALSE;
	}
	return TRUE;
}