delphi中怎样给IDispatch或OleVariant类型赋空值？ ( 积分: 50 )

D

delphicg

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• 2005-07-12

• #1

如题所视，请高手指点！

 

D

delphicg

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• 2005-07-12

• #2

如题所视，请高手指点！

 

F

foxphone2003

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• 2005-07-12

• #3

VarAsType(变量, varNull)

 

迷

迷糊

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• 2005-07-12

• #4

nil

 

A

Avalon

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• 2005-07-12

• #5

EmptyParam

 

D

delphicg

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• 2005-07-12

• #6

各位大侠，我是菜鸟！
能给出2个应用的例子吗？

 

D

delphicg

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• 2005-07-12

• #7

我试过了！
对IDispatch赋值都提示不匹配！
继续呀！

 

Z

zqw0117

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• 2005-07-13

• #8

EmptyParam

 

D

delphicg

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• 2005-07-13

• #9

没用，你的答案楼上的已经说过了！

 

Z

zjan521

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• 2005-07-13

• #10

IDispatch <- nil
OleVariant 上边说了

 

S

szkok

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• 2005-07-13

• #11

以前搞原生ADO时我是这样做的
var GG: OleVariant;

GG := Unassigned;