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GetVariableValue Problem

quentin66
Dear guys:

about the method "GetVariableValue",the help file says like this--PC-DMIS variables only hold values during execution; at learn time PC-DMIS variables have a value of zero. The GetVariableValue and SetVariableValue methods only change a variable's value during the script's execution. If you want to permanently change a value of a variable inside PC-DMIS, you should use the PutText method instead.

when my mouse enter the parameter,it shows the result on the screen.but how can i get that value?(offline software,but the program has been run before)


string ReturnValue="";
Variable tmpVarValue;
pcdPartProgram = pcdSession.ActivePartProgram;
tmpVarValue = pcdPartProgram.GetVariableValue(VarName);
if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_STRING)
{
ReturnValue = tmpVarValue.StringValue;
}
else if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_DOUBLE)
{
ReturnValue = tmpVarValue.DoubleValue.ToString("F3");
}
else if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_LONG)
{
ReturnValue = tmpVarValue.LongValue.ToString("F3");
}

then i get 0.000,whie the shown result is -0.071.and i wanna get the value -0.071



  • Can't see the tiny screenshot btw.



    Have you checked you are catching the Type properly?

    string ReturnValue="";
    Variable tmpVarValue;
    pcdPartProgram = pcdSession.ActivePartProgram;
    tmpVarValue = pcdPartProgram.GetVariableValue(VarName);
    if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_STRING)
    {
    messagebox.show("String")
    ReturnValue = tmpVarValue.StringValue;
    }
    else if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_DOUBLE)
    ​​​​​​​messagebox.show("Double")
    {
    ReturnValue = tmpVarValue.DoubleValue.ToString("F3");
    }
    else if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_LONG)
    ​​​​​​​messagebox.show("Long")
    {
    ReturnValue = tmpVarValue.LongValue.ToString("F3");
    }

    Have you tried it at runtime?
  • I use GetText for retrieving variable values, snippet from my program logger (full source somewhere in this forum): 

    'Assignment To look For
varname = "WATCHER"
' Is it enabled?
sstate = ""

For cnt = 1 To PCDCommands.Count
  Set PCDCommand = PCDCommands.Item(cnt)
  If ((PCDCommand.Type = 195) And (varname = PCDCommand.GetText(DEST_EXPR, 0))) Then
    wvar = [B]PCDCommand.GetText(SRC_EXPR, 0)[/B]

  If wvar = """""" Then
      sstate = " started @ "
      retval = PCDCommand.PutText("""TRUE""", SRC_EXPR, 0)
  End If
  If wvar = """TRUE""" Then
      sstate = " ended   @ "
      retval = PCDCommand.PutText("""""", SRC_EXPR, 0)
  End If


    The code is looking for a variable (assignment) called "WATCHER", when this is found and the contents of the variable is null we set it to "TRUE". Is it already "TRUE" then we clear it (empty). Note that this actually changes the assignment command in the program.
  • Can't see the tiny screenshot btw.



    Have you checked you are catching the Type properly?

    string ReturnValue="";
    Variable tmpVarValue;
    pcdPartProgram = pcdSession.ActivePartProgram;
    tmpVarValue = pcdPartProgram.GetVariableValue(VarName);
    if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_STRING)
    {
    messagebox.show("String")
    ReturnValue = tmpVarValue.StringValue;
    }
    else if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_DOUBLE)
    messagebox.show("Double")
    {
    ReturnValue = tmpVarValue.DoubleValue.ToString("F3");
    }
    else if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_LONG)
    ​​​​​​​messagebox.show("Long")
    {
    ReturnValue = tmpVarValue.LongValue.ToString("F3");
    }

    Have you tried it at runtime?



    Not yet.
    when i set my mouse on "UZZ",it shows "UZZ=0".but when i set my mouse on "OBTAIN("FA(N0001)",5,0)",it shows "OBTAIN("FA(N0001)",5,0)=-0.071".the command is as follows:

    ASSIGN/UZZ=OBTAIN("FA(N0001)",5,0)


    i need get the UZZ=-0.071.


    many thanks for your reply, .thank you very much!

    now we have a case to trans some varvalues to the automation system from programs which have been run.
  • I use GetText for retrieving variable values, snippet from my program logger (full source somewhere in this forum): 

    'Assignment To look For
varname = "WATCHER"
' Is it enabled?
sstate = ""

For cnt = 1 To PCDCommands.Count
Set PCDCommand = PCDCommands.Item(cnt)
If ((PCDCommand.Type = 195) And (varname = PCDCommand.GetText(DEST_EXPR, 0))) Then
wvar = [B]PCDCommand.GetText(SRC_EXPR, 0)[/B]

If wvar = """""" Then
sstate = " started @ "
retval = PCDCommand.PutText("""TRUE""", SRC_EXPR, 0)
End If
If wvar = """TRUE""" Then
sstate = " ended @ "
retval = PCDCommand.PutText("""""", SRC_EXPR, 0)
End If


    The code is looking for a variable (assignment) called "WATCHER", when this is found and the contents of the variable is null we set it to "TRUE". Is it already "TRUE" then we clear it (empty). Note that this actually changes the assignment command in the program.


    thank you .i tried this method,then i got "OBTAIN("FA(N0001)",5,0)",or other expressions(such as "ABS(A-B)")
  • in reply to quentin66
    That is because the value of UZZ really is "OBTAIN("FA(N0001)",5,0)"... It seems you are trying to call a function and have the result of that function put in UZZ?

    Is OBTAIN a PC-DMIS function?
  • thank you vpt! it is a expression.i should calculate the expression,then get its value.

    but how can i calculate the different expressions?any demo?
  • Try prefixing the expression with an accent grave:

    From 
    ASSIGN/UZZ=OBTAIN("FA(N0001)",5,0)


    to 
    ASSIGN/UZZ=´OBTAIN("FA(N0001)",5,0)


    and see if that works.

    Other than that, read up on chapter 26 in the helpfile...
  • when i set my mouse on "UZZ",it shows "UZZ=0"

    Never trust the variable value you see on mouse pop-up - it is often not what's expected. Execute the program, and show the value with a COMMENT.

  • you tell the true,thank you. but in this case,the program is executed by other automation system,and the program is cleared when finish.

    i should reopen the program and transfer some varValues to the database.
  • I think that's too late - write the variables to a file in the original program execution.
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