Thread: Termination

At the beginning of my game I do some system checking and was wanting to terminate the program if something is wrong.

This checking is done before a window is opened, etc.

I was just wondering if there's a command to stop the program? PostQuitMessage will terminate the program but it waits until after the initialization is done and the window is opened.

I wanted to terminate the program before the window is opened.

My initialization program is seperate from my main program and is called from the main.

mw

It's pretty strange what happens:

My initialization program is seperate from my main program. Both programs have been added to the project.

The first thing I do in the main program (in WinMain) is call the initialization function in my initialization program.

I already have an IF statement in my initialization function that basically says:

Code:

if (!initialized) PostQuitMessage (0);

(that's the basic idea; I typed that from memory)

The main program quits if the initialization fails. HOWEVER, it creates the parent window before the PostQuitMessage takes effect. Since I called the initialization function before I even created the parent window, then it should terminate without my seeing the parent window.

I don't know why it's decided to be a pain in the butt (other than the fact that Microsoft PROGRAMS Windows to be a pain in the butt).

mw

Ok, this probably sounds newbish but I seem to still have problems terminating my program:

My initialization program has an int variable in it named "flag".

If initialization is successful then flag == 1. Else, flag == 0.

I return flag at the end of the initialization.

When I get back to the main program, I IMMEDIATELY check the value of flag but it has no effect!?

I'm pretty sure that I'm having an issue with scope, but I don't know how to resolve it... :-(

mw

Ok, here's the main program:

Code:

#include "Initialization.h"
#include "resource.h"


/*

Project 0, Main

*/

//prototypes
LRESULT CALLBACK WndProc (HWND hwndMain, UINT message, WPARAM wParam, LPARAM lParam);

//global variables
static TCHAR szAppName[] = TEXT ("Project 0"); //name of window class
RECT         rect; //
HWND         hwndMain, hwndNew, hwndLoad, hwndOptions, hwndQuit, hwndOptionsBack; //handle to a window
HDC          hdc, hdcBitmapMem; //
MSG          msg; //structure for MSG
WNDCLASS     wc; //structure for WNDCLASS
int          cxScreen, cyScreen;
int          btnHeight = 30;
int          btnWidth = 110;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdline, int iCmdShow)
{
	Hard_Drive ();

	if (flag = 0)
	{
		return (0);
	}

	//register a window class
	etc...

Right now the only thing I initialize is the Hard_Drive (hence the function call). I truncated the remainder of the program, since that works fine.

Here's the initialization program:

Code:

#include "Initialization.h"

int Hard_Drive (void)
{
    bReturn = GetDiskFreeSpace
		(
		TEXT ("C:\\"),
        &dwSectorsPerCluster,
        &dwBytesPerSector,
        &dwFreeClusters,
        &dwTotalClusters
		);

    if (bReturn)
    {
        /* cast it to 64 bits for calculations */ 
        i64TotalBytes = (__int64)dwTotalClusters * dwSectorsPerCluster * dwBytesPerSector;
        i64AvailableBytes = (__int64)dwFreeClusters * dwSectorsPerCluster * dwBytesPerSector;

        //printf ("Available = %I64u MB\n", i64AvailableBytes / (1024 * 1024));
        //printf ("Total  = %I64u MB\n", i64TotalBytes / (1024 * 1024));

		flag = 1;

		if ((i64AvailableBytes / (1024 * 1024)) < 16000)
		{
			MessageBox (NULL, TEXT ("ERROR! Not enough hard drive space!"), NULL, MB_ICONERROR);

			flag = 0;
		}
    }
	else
	{
		flag = 0;
	}

	return flag;
}

That's the entire initialization so far... I have it set to give me an error if the available space is less than 16 gigabytes. I have 15 gigabytes remaining on my hard drive, and this forces an error to occur so that I can test this.

Here's the header file that both the main and the initialization program include:

Code:

#define WIN32_LEAN_MEAN
#define VC_LEAN

#include <windows.h>
#include <stdio.h>

//Hard drive initialization declarations
//======================
unsigned __int64 i64TotalBytes, i64AvailableBytes;    
BOOL  bReturn;
DWORD dwSectorsPerCluster, dwBytesPerSector, dwFreeClusters, dwTotalClusters;
int Hard_Drive (void);
int flag;
//======================

#endif

Ha! Thanks! Duh! :-)

It works fine now! :-)

mw