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[Help] Cannot retrieve a bstr* via com interface into a system.string in vb.net
Posted on 2016-07-27
Hello Everyone,
I am getting the following issue:
Cannot retrieve a bstr* via com interface into a system.string in vb.net
I tryed to use StringBuilder but then I get a compilation error.
I also did:
Dim Str as String = nothing
myobj.getMessage(Str)
--> result: nothing
Is there an equivalent like in c# using [ref] - > myobj.getMessage(ref Str); where this works as expected.
All inputs are welcome.
Thank you very much in advance.
Best regards
MiQi
I am getting the following issue:
Cannot retrieve a bstr* via com interface into a system.string in vb.net
I tryed to use StringBuilder but then I get a compilation error.
I also did:
Dim Str as String = nothing
myobj.getMessage(Str)
--> result: nothing
Is there an equivalent like in c# using [ref] - > myobj.getMessage(ref Str); where this works as expected.
All inputs are welcome.
Thank you very much in advance.
Best regards
MiQi
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7 Comments
Try:
Dim Str as String = "something"
If you pass Nothing as a reference, your method might have trouble with it.
Dim Str as String = "something"
If you pass Nothing as a reference, your method might have trouble with it.
Hello,
this solution does not work, I get something back as result. This does not modify the string.
please help.
thank you.
Best regards.
MiQi
this solution does not work, I get something back as result. This does not modify the string.
please help.
thank you.
Best regards.
MiQi
Active today
But you are not getting the string itself, rather you are getting the pointer. You need to retrieve the string value from the memory location that the pointer references. For that, .NET has some ready made helper methods in the System.Runtime.InteropServ
-saige-
-saige-
Hello,
Thank you for your comment, I just found the issue. It was not possible as like vb6 it won't work the same way. It was related to the odl definition. The parameter was only set [in] but should be [in, out]. Now it works nicely.
Thank you for your inputs but it related to the unmanaged code.
Hopefully not a big change to cover it.
Best regards.
MiQi
Thank you for your comment, I just found the issue. It was not possible as like vb6 it won't work the same way. It was related to the odl definition. The parameter was only set [in] but should be [in, out]. Now it works nicely.
Thank you for your inputs but it related to the unmanaged code.
Hopefully not a big change to cover it.
Best regards.
MiQi
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