[Solved]about VariantToBCD handling Null values

[gucao]

Are varEmpty and varNull equivalent?
Can the return value be set to 0 when vtype=1?
Will there be additional side effects?
Do I need to open a bug with this?

[PascalDragon]

Are varEmpty and varNull equivalent?

No, varEmpty and varNull are not equivalent. varEmpty is a Variant that is initialized, but has no value assigned. A variant with varNull is a Variant that is explicitely Null.

Can the return value be set to 0 when vtype=1?
Will there be additional side effects?
Do I need to open a bug with this?

It indeed seems like an oversight that varNull isn't handled in VariantToBCD so you should indeed open a bug report. Best provide an example that shows that VariantToBCD doesn't work correctly when you pass in a Variant that is Null.

[gucao]

No, varEmpty and varNull are not equivalent. varEmpty is a Variant that is initialized, but has no value assigned. A variant with varNull is a Variant that is explicitely Null.

It indeed seems like an oversight that varNull isn't handled in VariantToBCD so you should indeed open a bug report. Best provide an example that shows that VariantToBCD doesn't work correctly when you pass in a Variant that is Null.

Thank you for analyzing your knowledge ,I will open a bug report and upload a demo.

[gucao]

its Solved here https://forum.lazarus.freepascal.org/index.php/topic,59110.0.html