Thread: Help needed with program crash!

Hey all.

I am trying to make the minesweeper game, but I have one big problem that prevents me of continuing on my nearly finished project.

I cannot make the game run in turns. Everything runs exactly as I want it to the very first round, but after I input the coordinates of which tile to open in the second round, it crashes. It gives me the following error:

Code:

Debug Assertion Failed!

Program: {path}\minesweeper.exe
File: fprintf.c
Line: 55

Expression: (str != NULL)

I click on "Retry" to Debug, and get another window:

Code:

minesweeper.exe has triggered a breakpoint

It then shows me the line it supposedly breaks. The break point vary sometimes depending on my input, but usually it gives me the line I have marked in red.

You are reminded that this does NOT happen the first time the code is run, but only on the 2nd round.

Please help!

Code:

// SAVING DISPLAY DATA TO FILE
// TRANSFERRING DATA FROM MinesFile TO DisplayFile.

	MinesFile = fopen("MinesFile.txt","r");
	DisplayFile = fopen("DisplayFile.txt","w+");
	for (i=0;i<dimX;i++)
	{
		for (j=0;j<dimY;j++)
		{

			ch = fgetc(MinesFile);
			if ((ch == '0') || (ch == '1'))
			{
				fprintf(DisplayFile,"#");
			}
			else if (ch == '2')
			{
				count = check4Neighbours(dimY,dimX,i,j);
				if (count == 0)
				{
					fprintf(DisplayFile,".");
				}
				else
				{
					fprintf(DisplayFile,"%d",count);
				}
			}
		}
	}
	fclose(DisplayFile);
	fclose(MinesFile);

Hmm, ok I did. I got NULL on DisplayFile... how could that be? It works fine the first time!

Thanks for your reply Naung..

UPDATE:

Fixed the problem. I forgot an fclose in a previous function.