打不到VarAsType的解决办法

最新推荐文章于 2017-11-12 19:07:00 发布

iteye_6794

最新推荐文章于 2017-11-12 19:07:00 发布

阅读量121

点赞数

在 Delphi7 中，VarType 函数被移到 Variants 单元。文章讨论了直接赋值整数或浮点数到 Variant 类型字段时遇到的问题，并提出使用 StrToInt 和 StrToFloat 函数进行类型转换的方法。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

在uses单元加入Variants！

VarType function from Variants unit in Delphi 7

In Delphi 5, VarType function is declared in Systems unit. In Delphi 7, it is moved to Variants unit.
Declaration: property Values[const name: String]: Variant
My problem is the statement Values['fieldname']:= 0 gives problem and the statement Values['fieldname']:= StrToInt('0') seems to work.
The field in the table is an integer field.
The same thing happens with a float field, the statement Values['fieldname']:= 1 gives problem and the statement Values['fieldname']:= StrToFloat('1') seems to work.
Does the Variant need to be "informed" what datatype it is with the help of functions like StrToInt and StrToFloat?