BUG: Compiled Error 57 68020/68881 Option STRING$(32767,32) (71240)

SYMPTOMS

Below is an example of a problem using the STRING$(32767,32) function when compiled with the Generate 68020 Code or Generate 68881 Code option.

The following code usually (incorrectly) gives error 57 ("Device I/O Error") at run time on Apple System version 6.05. Sometimes Error 5 ("Invalid Function Call") incorrectly occurs when the program tries to print the FRE function after the string assignment a$ = STRING$(32767,32). In other, different combinations of QuickBasic versions, compiler options, and System versions, wrong screen output, System Errors, or hanging may occur.

The program is compiled with all compiler options including "Use default menus" and "Process events." The symptoms of this problem depend upon the version of the Apple System software.

This problem occurs in Microsoft QuickBasic versions 1.00, 1.00a, and 1.00b for Macintosh Systems. Microsoft is researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

When you compile without the Generate 68020 Code or Generate 68881 Code options, or if you changed the string assignment to a$ = STRING$(32766,32), no problem occurs.

   data: 74096   stack: 12212  string: 78820
   data: 74096   stack: 12212  string: xxxxx
				

   data: 74096   stack: 12212  string: 78820
   data: data:
 
    74096    74096
 
   stack: stack:
 
    12212    12212
 
   string: string:  78820
 
    78820
				

       WINDOW 1,"",(10,25)-(500,500)
       PRINT "data: ";FRE(-1);"stack: ";FRE(-2);"string: ";FRE("")
       a$ = STRING$(32767,32)
       PRINT "data: ";FRE(-1);"stack: ";FRE(-2);"string: ";FRE("")
       INPUT x   'for a pause
       WINDOW CLOSE 1
       END