MapleTrapError - Maple Help

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MapleTrapError

trap a Maple error in external code

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

MapleTrapError(kv, f, data, err)

Parameters

kv

-

kernel handle returned by StartMaple

f

-

function pointer

data

-

integer data

err

-

boolean flag set to True if an error occurs executing f

Description

• 

This function is part of the OpenMaple interface to Microsoft Visual Basic.

• 

The MapleTrapError function attempts to execute the VB function f(data). If a Maple error is raised at any time during execution of f, the function returns immediately after setting err to True.

• 

Use the GetProc and AddressOf commands to get the address of a VB function as shown in the example below.

• 

This function can be used to abort function calls when MapleRaiseError is invoked.

Examples

dim global_kv as long

Public Function TestTrapErrorCB1(data As Long) As Long

    MapleRaiseError global_kv, "test"

    TestTrapErrorCB1 = data

End Function

Public Function TestTrapErrorCB2(data As Long) As Long

    TestTrapErrorCB2 = EvalMapleStatement(global_kv, "int(x,x):")

End Function

Public Sub TestTrapError(ByVal kv As Long)

    Dim errorflag As Long

    Dim data As Long

    global_kv = kv

    data = MapleTrapError(kv, GetProc(AddressOf TestTrapErrorCB1), _

              365, errorflag)

    If errorflag = 0 Then

        MsgBox "should have been an error (errorflag = 1)", _

              vbInformation, ""

    End If

    data = MapleTrapError(kv, GetProc(AddressOf TestTrapErrorCB2), _

              0, errorflag)

    If errorflag = 1 Then

        MsgBox "should NOT have been an error (errorflag = 0)", _

              vbInformation, """"

    End If

End Sub

See Also

error

OpenMaple

OpenMaple/VB/API

OpenMaple/VB/Examples

traperror(deprecated)

 


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