Convert vb6.0 code into c#.

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Hello Experts,

I getting problem converting vb6.0 code into c#


Declare Function GSSymbol Lib "GSWDLL32.DLL" (ByVal fxOrg#, ByVal fyOrg#, ByVal nSymbol&, ByVal nClr&) As Long


Thanks,
T.Ramesh Kumar

What I have tried:

[DllImport("GSWDLL32.DLL", SetLastError = true)]
        public static extern long GSSymbol(
            long fxOrg, 
            long fyOrg, 
            long nSymbol, 
            long nClr
       );

error :-

<pre>Managed Debugging Assistant 'PInvokeStackImbalance' : 'A call to PInvoke function 'CTTS!CTTS.CTTSUtils::GSSymbol' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the

Posted 16-Nov-20 17:31pm

T. Ramesh Kumar

Updated 16-Nov-20 22:36pm

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CHill60 · Answer 1 · 2020-11-16T21:53:00

I'm not a fan of converting from VB6, rather I use it as a proof-of-concept or "specification" for the final .NET application - useful source of test results too.

In the light of that approach you might want to consider replacing the use of GSWDLL32 with something more modern - e.g. Chart Class (System.Windows.Forms.DataVisualization.Charting) | Microsoft Docs[^]

Richard Deeming · Answer 2 · 2020-11-16T22:36:00

Your type mapping is wrong. The VB6 declaration is:

VB

... (ByVal fxOrg As Double, ByVal fyOrg As Double, ByVal nSymbol As Long, ByVal nClr As Long) As Long

Type Characters - Visual Basic | Microsoft Docs[^]

But Long in VB6 refers to a 32-bit integer. In .NET, that's an Int32, which maps to Integer in VB.NET and int in C#.

So to match your VB6 code, your C# declaration should be:

C#

[DllImport("GSWDLL32.DLL", SetLastError = true)]
public static extern int GSSymbol(
    double fxOrg, 
    double fyOrg, 
    int nSymbol, 
    int nClr
);

Maciej Los · Answer 3 · 2020-11-16T20:59:00

Solution 1

Check this out: DllImportAttribute Class (System.Runtime.InteropServices) | Microsoft Docs[^].

There's few fields to set:

BestFitMapping
CallingConvention
CharSet
EntryPoint
ExactSpelling
PreserveSig
SetLastError
ThrowOnUnmappableChar

Posted 16-Nov-20 20:59pm

Maciej Los

Convert vb6.0 code into c#.

3 solutions

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