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vb calling vc's Dll problem, "Bad DLL calling convention" Run-time erroe '49' appears

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 China

Post time: 2020-1-7 13:50:02
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Functions exported using MFC DLL in VC:
void __stdcall PrintPortOut (BYTE data)
{
theApp._outp (0x378, data);
}
And there is output in .def: EXPORTS
    ; Explicit exports can go here
PrintPortOut

Then call in VB:
Declare Function q Lib "PrintPort.dll" Alias ​​"PrintPortOut" _
    (ByVal pSelectAdapter As Byte)

Private Sub Command1_Click ()
Dim c As String
Dim d As Byte
d = CByte (&H0)
c = q (d)
End Sub
But the execution will always error: "Bad DLL calling convention" Run-time erroe '49'?
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 Author| Post time: 2020-1-9 13:27:01
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Everyone gives suggestions.
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Post time: 2020-1-9 16:45:01
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See if the array is out of bounds
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 Author| Post time: 2020-1-10 10:54:02
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Thank you, there should be no problem with arrays out of bounds?
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Post time: 2020-1-10 20:45:01
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DLL should be regular DLL
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 Author| Post time: 2020-1-24 16:36:01
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Thank you, it has been resolved, it is a VB problem.
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Post time: 2020-9-6 01:45:01
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Excuse me, what is the problem, I also encountered this problem. . . .
How to solve it. .
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