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Question : How to represent a null in a string?
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I am trying to use a serial port utility in my vs 2005 vb project. The syntax of the statement is outlined on their site as follows: ----------------------------------------------------------------------------------------------- Syntax 2 Value = object.Read ( StartTrigger, EndTrigger, Timeout )
Part Type Description object SerialNET.Port An object that evaluates to an SerialNET.Port object. Value string Data received from serial port. Nothing/null if no data received. StartTrigger string. EndTrigger string. Timeout int See OnRead for details. ---------------------------------------------------------------------------------------------
Elsewhere in their limited documentation it says that I can set the "StartTrigger" string to null if I don't want to utilize a StartTrigger. So, I tried structuring my code as:
psWork1 = objPort.read( "", EndTrig, 10000)
Where I was hoping the "" would act as a null....but it didn't. And all I can get from the wiseguy in tech support is a lecture about how "" is the not the same as null....but he won't tell me HOW to represent a null in this "StartTrigger" string.
So....how do I do this? Could I set up a string variable named StrTrig and put a "value" of null in it? What would the actual syntax be? TIA
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Answer : How to represent a null in a string?
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Can you give these a try ... psWork1 = objPort.read( null, EndTrig, 10000) psWork1 = objPort.read( nothing, EndTrig, 10000) psWork1 = objPort.read( System.DbNull.Value, EndTrig, 10000)
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