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how can I call into a csharp dll from delphi

I need to call a procedure in a c-sharp library from delphi.  Project compiles, but causes an Access Violation when executed, before the project code is run (during load).
Here is my external declaration in delphi:

procedure OpenRxEntryForm(iToken: Integer; Prescription_id: AnsiString ) stdcall; external 'RxTracker.dll';
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2 Solutions
Ephraim WangoyaCommented:
First get rid of the string

procedure OpenRxEntryForm(iToken: Integer; Prescription_id: PChar ) stdcall; external 'RxTracker.dll';
TheMatrixDuckAuthor Commented:
sorry... got rerouted to another issue.  Please leave this question open, I shall return.
TheMatrixDuckAuthor Commented:
ReRouted to another project branch.  Haven't tested the solution yet, but the answer is at least a partial solution.
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