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。
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.
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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