请问各位如何用sendmessage中的findstring来防止向combobox添加相同的项目(50分)

A

aa9

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GUEST, unregistred user!

• 2001-05-23

• #1

 

Z

zqs10597249

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GUEST, unregistred user!

• 2001-05-25

• #2

combobox1.Items.IndexOf(str)=-1<br>看str有没存在<br>这样不好吗？

 

A

aa9

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• 2001-05-26

• #3

&nbsp; 这样当然可以但我想知道<br>&nbsp; &nbsp;sendmessage(combobox1.handle,lb_findstring,0,'aa');<br>&nbsp; &nbsp;//aa是我想找的string<br>&nbsp; &nbsp;//照win32sdk中的意思 lb_findstring的lParam是不为空的string<br>&nbsp; &nbsp;//但运行说 最后一个参数类型错误,我想知道究竞错在哪而已

 

刘

刘李子

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• 2001-05-26

• #4

if sendmessage( &nbsp;combobox1.handle, cb_findstring, -1, lparam( lpcstr('aaa') ) &nbsp = CB_ERR then<br>&nbsp; showmessage('specified string not found !');<br>最后一个参数为指向字符串的地址 ！<br>

 

Z

zqs10597249

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GUEST, unregistred user!

• 2001-05-26

• #5

to aa9:<br>procedure TForm1.Button1Click(Sender: TObject);<br>var<br>str:string;<br>num:integer;<br>begin<br>str:=edit1.Text;<br>num:=sendmessage( combobox1.handle, cb_findstring, -1,Cardinal(str));<br>edit2.text:=inttostr(num);<br>if num=-1 then<br>begin<br>showmessage('没找到!');<br>end;<br>end;<br>可以给分了吧！

 

Z

zqs10597249

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GUEST, unregistred user!

• 2001-05-26

• #6

刘李子厉害

 

A

aa9

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GUEST, unregistred user!

• 2001-06-01

• #7

多人接受答案了。