[英]How to get tooltip text for a given HWND?
I'm looking for a way to get the tooltip control (if any) which is associated with a given HWND.我正在寻找一种方法来获取与给定 HWND 关联的工具提示控件(如果有)。 The text of the tooltip control would be sufficient, too.工具提示控件的文本也足够了。 The closest thing I found is the TTM_GETTEXT message, but it's meant to be sent to the tooltip control itself instead of the tool it's associated with.我发现的最接近的是TTM_GETTEXT消息,但它的目的是发送到工具提示控件本身而不是与其关联的工具。 I don't have a handle to the tooltip control though.不过,我没有工具提示控件的句柄。 Does anybody know how to do this?有人知道怎么做这个吗?
All this is done using plain Windows API in C++.所有这些都是使用 C++ 中的普通 Windows API 完成的。
There doesn't seem to be a specific message to get the tip or its text from the control, but this is how MFC's CWnd class implements OnToolHitTest(), which you should be able to adapt to Win32:似乎没有从控件中获取提示或其文本的特定消息,但这就是 MFC 的 CWnd 类实现 OnToolHitTest() 的方式,您应该能够适应 Win32:
INT_PTR SomeFunction(HWND hWndChild, TOOLINFO *pTI)
{
if (hWndChild != NULL) // Your HWND being tested
{
// return positive hit if control ID isn't -1
INT_PTR nHit = _AfxGetDlgCtrlID(hWndChild);
// Replace with GetDlgCtrlID().
// hits against child windows always center the tip
if (pTI != NULL && pTI->cbSize >= sizeof(AFX_OLDTOOLINFO))
{
// setup the TOOLINFO structure
pTI->hwnd = m_hWnd;
pTI->uId = (UINT_PTR)hWndChild;
pTI->uFlags |= TTF_IDISHWND;
pTI->lpszText = LPSTR_TEXTCALLBACK;
// set TTF_NOTBUTTON and TTF_CENTERTIP if it isn't a button
if (!(::SendMessage(hWndChild, WM_GETDLGCODE, 0, 0) & DLGC_BUTTON))
pTI->uFlags |= TTF_NOTBUTTON|TTF_CENTERTIP;
}
return nHit;
}
return -1; // not found
}
Hopefully this will be useful.希望这将是有用的。
To get tooltip text from some control you could use TTN_NEEDTEXT
message.要从某些控件获取工具提示文本,您可以使用TTN_NEEDTEXT
消息。 It was designed to be used by the ToolTip control, but I cannot see any reason why you could not send it from other place.它被设计为供 ToolTip 控件使用,但我看不出有什么理由不能从其他地方发送它。
You could enumerate the windows looking for a tooltip control that has a parent of the required window.您可以枚举窗口以查找具有所需窗口的父级的工具提示控件。 You'll need to supply the window together with the tool id (normally from GetDlgCtrlID
)...:您需要提供窗口和工具 ID(通常来自GetDlgCtrlID
)...:
HWND hToolTipWnd = NULL;
BOOL GetToolTipText(HWND hWnd, UINT nId, std::wstring& strTooltip)
{
hToolTipWnd = NULL;
EnumWindows(FindToolTip, (LPARAM)hWnd);
if (hToolTipWnd == NULL)
return FALSE;
WCHAR szToolText[256];
TOOLINFO ti;
ti.cbSize = sizeof(ti);
ti.hwnd = hWnd;
ti.uId = nId;
ti.lpszText = szToolText;
SendMessage(hToolTipWnd, TTM_GETTEXT, 256, (LPARAM)&ti);
strTooltip = szToolText;
return TRUE;
}
BOOL CALLBACK FindToolTip(HWND hWnd, LPARAM lParam)
{
WCHAR szClassName[256];
if (GetClassName(hWnd, szClassName, 256) == 0)
return TRUE;
if (wcscmp(szClassName, L"tooltips_class32") != 0)
return TRUE;
if (GetParent(hWnd) != (HWND)lParam)
return TRUE;
hToolTipWnd = hWnd;
return FALSE;
}
I don't know if the window whose tooltip you want to retrieve is a child of a window you have created.我不知道您要检索其工具提示的窗口是否是您创建的窗口的子窗口。
If this is the case, you can handle the NM_TOOLTIPSCREATED notification, which is sent by a child window to its parent when it creates a tooltip (or should be sent: it is true for common controls but I don't know for other kinds of windows).如果是这种情况,您可以处理 NM_TOOLTIPSSCREATED 通知,该通知由子窗口在创建工具提示时发送到其父窗口(或应该发送:对于常见控件是正确的,但我不知道其他类型的视窗)。 This notification includes a handle to the tooltip window.此通知包括工具提示窗口的句柄。
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