怎样判断Variant变量中内容的类型?
解决方案 »
- 发个帖:createservice创建的服务无法启动,有经验的大神指教下
- 1111被一帮光棍敲诈要我散分
- fastreport 幾個有難度的問題(分不夠再加)
- 明天要复试了,有一道题我还不会,希望大家帮助,万分感谢
- DBChart中series的动态添加问题. 满分求教!!!
- <help>Quick Report 打印不能分頁
- DLL问题恳请大家请帮忙
- 我想写这样的SQL语句,请各位帮忙看一下,
- Jpg图象及Paradox
- 这个错误是什么意思????
- 能对字段以代码的形式进行Newvalue属性的符值吗?下面是我的代码:ClientDataSet1.Fields[1].newValue:=edit1.text,但是系统提示错误。
- 一个sql问题
varEmpty The variant is Unassigned.
varNull The variant is Null.
varSmallint 16-bit signed integer (type Smallint).
varInteger 32-bit signed integer (type Integer).
varSingle Single-precision floating-point value (type Single).
varDouble Double-precision floating-point value (type Double).
varCurrency Currency floating-point value (type Currency).
varDate Date and time value (type TDateTime).
varOleStr Reference to a dynamically allocated UNICODE string.varDispatch Reference to an Automation object (an IDispatch interface pointer).
varError Operating system error code.
varBoolean 16-bit boolean (type WordBool).
varVariant A variant.
varUnknown Reference to an unknown OLE object (an IInterface or IUnknown interface pointer).
varShortInt 8-bit signed integer (type ShortInt)
varByte A Byte
varWord unsigned 16-bit value (Word)
varLongWord unsigned 32-bit value (LongWord)
varInt64 64-bit signed integer (Int64)varStrArg COM-compatible string.
varString Reference to a dynamically allocated string (not COM compatible).
varAny A CORBA Any value.