If Option Strict is Off and you do not specify the data type of a parameter in parameterlist , the Visual Basic compiler converts the corresponding argument to the Object Data Type.
Similarly, if you do not specify returntype , the compiler takes the return data type to be Object. Because you are dealing with an external procedure that might have been written on a different platform, it is dangerous to make any assumptions about data types or to allow them to default. It is much safer to specify the data type of every parameter and of the return value, if any.
This also improves the readability of your code. An external reference is in scope throughout its class, structure, or module. An external reference has the same lifetime as the class, structure, or module in which it is declared. Calling an External Procedure. You call an external procedure the same way you call a Function or Sub procedure—by using it in an expression if it returns a value, or by specifying it in a Call Statement if it does not return a value.
You pass arguments to the external procedure exactly as specified by parameterlist in the Declare statement. Do not take into account how the parameters were originally declared in the external file.
Similarly, if there is a return value, use it exactly as specified by returntype in the Declare statement. Character Sets. You can specify in charsetmodifier how Visual Basic should marshal strings when it calls the external procedure. The Auto modifier directs Visual Basic to marshal strings according to. NET Framework rules based on the external reference name , or aliasname if specified. The default value is Ansi.
Ansi and Unicode both direct Visual Basic to look it up without modifying its name during the search. Auto directs Visual Basic to determine the base character set of the run-time platform and possibly modify the external procedure name, as follows:.
On a Unicode platform, such as Windows, first look up the external procedure with no name modification. If that fails, append "W" to the end of the external procedure name and look it up again. On an ANSI platform, first look up the external procedure with no name modification. If that fails, append "A" to the end of the external procedure name and look it up again. Visual Basic uses the. Obviously p-code in IDE is not so lucky with stack repair. Add a comment.
Active Oldest Votes. Alternately, you can put the DLL in one of the other locations specified in my link. Improve this answer. Marc Bernier Marc Bernier 2, 24 24 silver badges 44 44 bronze badges. Another workaround is to always change the working directory before calling the DLL. Jamie Jamie 21 1 1 bronze badge. Ken White Ken White k 13 13 gold badges silver badges bronze badges.
Are you sure ZLIB doesn't have to be registered? I suggest you register it and try again. Jay Riggs Jay Riggs Quite sure. If I try Regsvr32 then I get a 'This file cannot be registered' error.
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Hope it helps. LPlates, I am not using a form, just a plain vbs file for users to double click to run. Here is the detail of how and why I want to use this: My company is upgrading from Office 97 to I have to accomplish this from a vbs file, before user opens the front-end db file. I don't understand why do you want to do in such a hard way. Application" Msgbox MSAccess.
Shell" Msgbox WSH. Hypetia I tried first set of code in a vbs file and get an error: Line 3, object doesn't support this property. In an Access module, the error says "version" method or property is not supported.
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