Q67697: UI Toolbox: "Subscript Out of Range" or Hang on WindowDo Call
Article: Q67697 Product(s): See article Version(s): 7.00 7.10 Operating System(s): MS-DOS Keyword(s): ENDUSER | buglist7.00 buglist7.10 | mspl13_basic Last Modified: 14-DEC-1990 If more than 20 buttons and edit fields are opened simultaneously within a single window, a "Subscript out of range" error will occur on a call to the SUB procedure WindowDo at run time. In some instances, a call to WindowDo may lead to a "String space corrupt" error message or cause the computer to hang. Microsoft has confirmed this to be a problem with the User Interface (UI) Toolbox provided with Microsoft BASIC Professional Development System (PDS) versions 7.00 and 7.10. The correction for this problem is provided further below. This information applies to BASIC PDS versions 7.00 and 7.10 for MS-DOS. To avoid the problem, change the default value of the constant MAXHOTSPOT, which appears in the file, GENERAL.BI. Two other constants MAXBUTTON and MAXEDITFIELD, which appear in GENERAL.BI, set the maximum number of buttons and edit fields allowed. The value of MAXHOTSPOT should be changed from its current setting of 20 to the sum of these two constants. The default setting for MAXBUTTON is 50, and the default setting for MAXEDITFIELD is 20. MAXHOTSPOT should be changed to 70. If a call to the SUB program WindowDo leads to a computer hang or a "String space corrupt" error message, Microsoft suggests changing the constants as described in the above paragraph and rebuilding the UI Toolbox default libraries, UITBEFR.LIB and UITBEFR.QLB. A computer hang or "String space corrupt" error message usually occurs when the default libraries have been modified and the modules that make up the UI Toolbox have not been compiled with the /D option. The /D option enforces array bounds checking on arrays. Using the /D compile option will help to avoid a computer hang or a "String space corrupt" error message at run time. The following assumes that you are using the default LINK library UITBEFR.LIB and the Quick library UITBEFR.QLB built during set up of BASIC PDS. Once the modifications to GENERAL.BI have been made, update the library UITBEFR.LIB and re-create the default Quick library UITBEFR.QLB. Below are the steps necessary to update the .LIB file and re-create the .QLB file. Because the files GENERAL.BAS, MENU.BAS, MOUSE.BAS, and WINDOW.BAS all require GENERAL.BI, they must be recompiled from DOS as follows: BC GENERAL.BAS /FS/X/D; BC MENU.BAS /FS/X/D; BC MOUSE.BAS /FS/X/D; BC WINDOW.BAS /FS/X/D; Enter the following command line from DOS to modify the library, UITBEFR.LIB: LIB UITBEFR.LIB-+GENERAL.OBJ-+MENU.OBJ-+MOUSE.OBJ-+WINDOW.OBJ Enter the following from DOS to re-create the Quick library, UITBEFR.QLB: LINK /Q UITBEFR.LIB,,,QBXQLB.LIB;
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