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51 lines
2.2 KiB
Plaintext
51 lines
2.2 KiB
Plaintext
{{QBDLDATE:05-20-2022}}
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{{QBDLTIME:23:12:09}}
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[[CHAIN]] is used to change seamlessly from one module to another one in a program.
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{{PageSyntax}}
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: [[CHAIN]] {{Parameter|moduleName$}}
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{{PageLegacySupport}}
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* The multi-modular technique goes back to when '''QBasic''' and '''QuickBASIC''' had module size constraints. In '''QB64''' the [[CHAIN]] statement has been implemented so that that older code can still be compiled, though it is advisable to use single modules for a single project (not counting [[$INCLUDE]] libraries), for ease of sharing and also because the module size constraints no longer exist.
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{{Parameters}}
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* {{Parameter|moduleName$}} is a variable or a literal [[STRING]] value in quotation marks with the optional EXE or BAS file name extension.
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{{PageDescription}}
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* CHAIN requires that both the invoking and called modules are of either .BAS or .EXE file types.
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* In Windows, '''QB64''' will automatically compile a CHAIN referenced BAS file if there is no EXE file found.
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* CHAIN looks for a file extension that is the same as the invoking module's extension.
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* The module's filename extension is not required. To save editing at compile time just omit the extensions in the calls.
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* To pass data from one module to the other use [[COMMON SHARED]]. The COMMON list should match [[type]]s and names.
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* '''QB64 does not retain the [[SCREEN]] mode like QBasic did.'''
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* Variable data can be passed in files instead of using [[COMMON SHARED]] values. '''QB64''' uses files to pass [[COMMON]] lists.
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* [[Keywords_currently_not_supported_by_QB64#Keywords_Not_Supported_in_Linux_or_MAC_OSX_versions|Not available in Linux or macOS]]'''.
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''QBasic/QuickBASIC:''
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* Compiled EXE files had to include BRUN45.EXE in QuickBASIC 4.5 when CHAIN was used with [[COMMON SHARED]].
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{{PageExamples}}
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''Example:'' CHAIN looks for same file type extension as program module (BAS or EXE).
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{{CodeStart}}
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{{Cl|CHAIN}} "Level1"
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{{CodeEnd}}
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''Explanation:'' The file referred to is "Level1.BAS" if the program module using the call is a BAS file. If the program was compiled, it would look for "Level1.EXE".
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{{PageSeeAlso}}
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* [[RUN]]
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* [[COMMON]], [[COMMON SHARED]]
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* [[SHARED]]
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* [[LINKed or Merged Modules]]
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{{PageNavigation}}
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