为何运行ReadFile和Clearcommerror函数老是出错！！！！(0分)

Y

yy-xx

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• 2000-05-15

• #1

在delphi中<br>var coms:tcomstat;<br>&nbsp; &nbsp; lpoloverlapped;<br>begin<br>&nbsp;Clear:=Clearcommerror(hcom,lpErrors,@Coms);<br>&nbsp;ReadFile(hCom,Read_Buffer,cbNum,readNumber,lpol);<br>end;<br>当运行上面两条语句时，为何在@Coms和lpol前老是提示实参和虚参不一致的错误？？？本程序用于串行通信。<br>能解答送分！！！

 

P

partisan

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• 2000-05-16

• #2

var coms:Tcomstat;<br>&nbsp; &nbsp; lpol:Toverlapped;<br>begin<br>&nbsp;Clear:=Clearcommerror(hcom,lpErrors,@Coms);<br>&nbsp;ReadFile(hCom,Read_Buffer,cbNum,readNumber,@lpol);<br>end;<br>两个问题是一个毛病，直接用指针而没有实际的对象<br>

 

D

DPET

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• 2000-05-17

• #3

You should add the Useing Unit before those function.

 

Y

yy-xx

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• 2000-05-17

• #4

回Partisan:<br>按你指点还是不行！！！<br>有哪位大侠能给指点，定有重酬！！！

 

千

千中元

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• 2000-05-19

• #5

省我的分数了。。呵呵

 

P

partisan

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• 2000-05-19

• #6

yy-xx:<br>你是按照我的写法写的吗？我都试过了没问题啊。

 

Y

yy-xx

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• 2000-05-21

• #7

Partisan:绝对是按照恁的指示，我还是用粘贴啦，编译还是出现：<br>Types of actual and formal var parameters must be identical。<br>请再出点主意！！！！有重分！！！很急！！！！

 

千

千中元

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• 2000-05-22

• #8

partisan 把您试的程序发给yyxx,顺便抄送sheepishest@china.com;}

 

P

partisan

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• 2000-05-22

• #9

看来是你那个Read_Buffer的问题，如果是Pointer类型，应该写成<br>Read_Buffer^<br><br>(后面加个小尖)

 

H

hubutong

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• 2000-05-23

• #10

你的lpErrors,cbNum,readNumber是不是定义成integer型了 把它们定义成DWord<br>就行了 你可以去看MS SDK查找这两个函数的原型 &nbsp;

 

L

lylyly

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• 2000-05-25

• #11

你用的是delphi4还是delphi5。<br>照如下定义就OK了。<br>comsComStat;<br>lpErrors,cbNum,readNumberWord;<br><br><br>&nbsp; &nbsp;

 

C

crazywind

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• 2000-05-25

• #12

var <br>&nbsp; &nbsp;lpl : Poverlapped;<br>&nbsp; &nbsp;lpl应该是指针类型的，那@lpl、lpl^和lpl有什么区别啊？<br>请高手指点啦

 

W

wjiachun

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• 2000-09-15

• #13

接受答案了.