RAD Studio VCL Reference
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System.varNull Constant

Represents a Variant that holds a null value.

Pascal
varNull = $0001;
C++
varNull = 0x0001;

System

When a Variant is assigned a null value, it is set to the varNull type.  

Use VarType to determine the variant type. 

 

TVarType 

VarAsType 

VarIsNull 

VarType

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