如何在使用CB_SETCURSEL时发送CBN_SELCHANGE消息？ [英] How to send a CBN_SELCHANGE message when using CB_SETCURSEL?

问题描述

使用 CB_SETCURSEL 讯息时，不会传送 CBN_SELCHANGE 讯息。

如何通知对照组选择已更改？

PS / p>

我在 Sexchange 网站，一个非常丑陋的黑客：

  SendMessage（hwnd，0x014F / * CB_SHOWDROPDOWN * /，1,0）; 
 SendMessage（hwnd，0x014E / * CB_SETCURSEL * /，ItemIndex，0）; 
 SendMessage（hwnd，0x0201 / * WM_LBUTTONDOWN * /，0，-1）; 
 SendMessage（hwnd，0x0202 / * WM_LBUTTONUP * /，0，-1）; 
  

现在...不是真的。

PS2

为了解决我的问题，我将在评论中跟踪Ken的建议。

解决方案

除非用户进行了选择更改，否则不应使用CBN_SELCHANGE。

您不会指明您使用的是哪种语言;

在Delphi中，OnChange（）会与组合框相关联，您只需调用事件方法：

  //将CB_SETCURSEL消息发送到组合框
 PostMessage（ComboBox1.Handle，CB_SETCURSEL，Whatever ，WhateverElse）; 
 
 //直接调用OnChange（）处理程序，这相当于CBN_SELCHANGE 
 ComboBox1Change（nil）; 
  

When using the CB_SETCURSEL message, the CBN_SELCHANGE message is not sent.

How to notify a control that the selection was changed ?

P.S.

I found on the Sexchange site, a very ugly hack :

SendMessage( hwnd, 0x014F/*CB_SHOWDROPDOWN*/, 1, 0 );
SendMessage( hwnd, 0x014E/*CB_SETCURSEL*/, ItemIndex, 0 );
SendMessage( hwnd, 0x0201/*WM_LBUTTONDOWN*/, 0, -1 );
SendMessage( hwnd, 0x0202/*WM_LBUTTONUP*/, 0, -1 );

Will do for now... Not really.

P.S.2

For resolving my problem, I'll follow Ken's suggestion in the comments.

解决方案

You're not supposed to use CBN_SELCHANGE unless the change in selection was made by the user.

You don't indicate what language you're using; it would make it easier to provide you with a workaround if you did so.

In Delphi, where an OnChange() would be associated with the combobox, you just call the event method directly:

// Send the CB_SETCURSEL message to the combobox
PostMessage(ComboBox1.Handle, CB_SETCURSEL, Whatever, WhateverElse);

// Directly call the OnChange() handler, which is the equivalent to CBN_SELCHANGE
ComboBox1Change(nil);

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