Q61403: LPRINT Followed by BLOAD or BSAVE Gives "File Already Open"
Article: Q61403 Product(s): See article Version(s): 7.00 | 7.00 Operating System(s): MS-DOS | OS/2 Keyword(s): ENDUSER | SR# S900417-59 buglist7.00 fixlist7.10 | mspl13_basic Last Modified: 13-AUG-1990 Performing an LPRINT statement prior to a BLOAD or BSAVE statement causes a "file already open" error to occur on the BLOAD or BSAVE statement if the program is run from the QBX.EXE environment or if it is compiled with the BC /Fs (Far Strings) option. Microsoft has confirmed this to be a problem in Microsoft BASIC Professional Development System (PDS) version 7.00 for MS-DOS and MS OS/2. It does not occur in earlier BASIC versions. This problem was corrected in Microsoft BASIC PDS version 7.10. The program below demonstrates this problem. To generate the "file already open" error, run this program from the QBX.EXE environment or compile it with the Far Strings option. The following is a list of workarounds for this problem: 1. Open the printer as a device and send output to the printer using the PRINT #<file number> statement instead of the LPRINT statement. 2. Issue a CLOSE statement after the LPRINT statement. 3. For an executable program, compile the program with the Near Strings option. Code Example ------------ CLS PRINT "hello" DEF SEG = &HB800 'points to the segment at the screen buffer BSAVE "picture", 0, 4000 'save the screen in the file named picture DEF SEG 'restore default segment LPRINT "bob" DEF SEG = &HB800 BLOAD "picture", 0 '**file already open error occurs here DEF SEG
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