使用 CB_SETCURSEL 时如何发送 CBN_SELCHANGE 消息?

How to send a CBN_SELCHANGE message when using CB_SETCURSEL?(使用 CB_SETCURSEL 时如何发送 CBN_SELCHANGE 消息?)

问题描述

使用CB_SETCURSEL 消息时，不会发送CBN_SELCHANGE 消息.

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

如何通知控件选择已更改?

How to notify a control that the selection was changed ?

附言

我在 Sexchange 网站上发现了一个非常丑陋 hack :

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 );

暂时会做...不是真的.

Will do for now... Not really.

P.S.2

为了解决我的问题，我会在评论中遵循 Ken 的建议.

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

推荐答案

除非用户对选择进行了更改，否则不应使用 CBN_SELCHANGE.

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

您没有指明您使用的是哪种语言；如果您这样做，则可以更轻松地为您提供解决方法.

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

在 Delphi 中，OnChange() 将与组合框关联，您只需直接调用事件方法:

In Delp 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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