打不到VarAsType的解决办法

最新推荐文章于 2024-05-31 14:20:05 发布

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#delphi #function #integer #string #float #table

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本文探讨了在 Delphi7 中使用 Variants 单元进行 VarType 函数操作的方法。作者指出，在 Delphi5 中 VarType 函数声明于 Systems 单元，而在 Delphi7 中则移至 Variants 单元。文章还讨论了在设置表格字段值时遇到的问题，即直接赋值整数或浮点数值导致错误，而通过 StrToInt 或 StrToFloat 函数转换后再赋值则能正常工作。

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?