RAD Studio VCL Reference
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System.varUnknown Constant

Represents a Variant that holds an unknown value.

Pascal
varUnknown = $000D;
C++
varUnknown = 0x000D;

When a Variant is assignned a value that is not recognised, it is set to the varUnknown type.  

Use VarType to determine the variant type. 

 

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