C，win32：l需要sendmessage函数的帮助 [英] C, win32: l need help with sendmessage function

问题描述

我需要帮助我如何在我的程序中向病例WM_NOTIFY发送消息。我希望当点击一个按钮时（如下面的WM_COMMAND），SendMessage函数激活WM_NOTIFY案例，以便WM_NOTIFY案例中的代码运行。

l已经尽了最大努力，但我只是得不到处理异常错误消息。

以下片段;

Please l need help on how i can send message to case WM_NOTIFY in my program. l want when a button is clicked(as in the case WM_COMMAND below), the SendMessage function activates case WM_NOTIFY so that the codes inside the WM_NOTIFY case will run.
l had tried my best but l only get unhandled exception error messages.
snippet below;

case WM_COMMAND:
		wmId    = LOWORD(wParam);
		wmEvent = HIWORD(wParam);
		// Parse the menu selections:
		switch (wmId)
		{
		case IDC_NEXTBTN:
			QueNo++;
			SendMessage(hWnd,WM_NOTIFY,(int)IDC_NEXTBTN,(NMHDR)lParam);//here l cast wparam to int and wparam to (NMHDR) according to msdn for WM_NOTIFY
			break;
......

而在WM_NOTIFY，我有

while in WM_NOTIFY, i have

case WM_NOTIFY:
		{
		
		if(lpnmhdr->code==TCN_SELCHANGE||lpnmhdr->hwndFrom==NextBtn){
			
.....
}

或者还有其他方法可以实现它。

谢谢大家



< b>我尝试了什么：

Or is there any other way l can implement it.
Thanks everyone

What I have tried:

SendMessage(hWnd,WM_NOTIFY,(int)IDC_NEXTBTN,(NMHDR)lParam)

推荐答案

引用：

SendMessage函数激活案例WM_NOTIFY，以便WM_NOTIFY案例中的代码运行。

the SendMessage function activates case WM_NOTIFY so that the codes inside the WM_NOTIFY case will run.

我不会这样做。相反，我会将 WM_NOTIFY case中的代码作为一个函数进行分解并直接调用这样的函数。

I won't do that. Instead I would factor out 'the code inside the WM_NOTIFY case' as a function and call directly such a function.

case WM_COMMAND:
		wmId    = LOWORD(wParam);
		wmEvent = HIWORD(wParam);
		// Parse the menu selections:
		switch (wmId)
		{
		case IDC_NEXTBTN:
			QueNo++;
			NMHDR nmh;
			nmh.code = NM_CLICK;    // Message type defined by control.
			nmh.idFrom =IDC_NEXTBTN;
			nmh.hwndFrom = NextBtn;
			SendMessage(GetParent(NextBtn),	WM_NOTIFY, nmh.idFrom, (LPARAM)&nmh);
			
			break;

根据Konfeld提供的链接。

非常感谢所有贡献的人。

@CPallini：我会的，但不会比我想要的好多了。

Based on the link given by Konfeld.
And many thanks to all of you who contributed.
@CPallini: l would have but it wouldn't be much better than as l wanted.

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