我一直在寻找解决方案,但我找不到太多信息。
我正在寻找的是一个小程序,当鼠标点击文本可编辑字段(如Windows窗体或浏览器页面中的文本框)时显示通知。
唯一的出发点是old question from so,它引导我进行以下操作:
// Global variable.
HWINEVENTHOOK g_hook;
// Initializes COM and sets up the event hook.
//
void InitializeMSAA()
{
CoInitialize(NULL);
g_hook = SetWinEventHook(
EVENT_SYSTEM_MENUSTART, EVENT_SYSTEM_MENUEND, // Range of events (4 to 5).
NULL, // Handle to DLL.
HandleWinEvent, // The callback.
0, 0, // Process and thread IDs of interest (0 = all)
WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS); // Flags.
}
// Unhooks the event and shuts down COM.
//
void ShutdownMSAA()
{
UnhookWinEvent(g_hook);
CoUninitialize();
}
// Callback function that handles events.
//
void CALLBACK HandleWinEvent(HWINEVENTHOOK hook, DWORD event, HWND hwnd,
LONG idObject, LONG idChild,
DWORD dwEventThread, DWORD dwmsEventTime)
{
IAccessible* pAcc = NULL;
VARIANT varChild;
HRESULT hr = AccessibleObjectFromEvent(hwnd, idObject, idChild, &pAcc, &varChild);
if ((hr == S_OK) && (pAcc != NULL))
{
BSTR bstrName;
pAcc->get_accName(varChild, &bstrName);
if (event == EVENT_SYSTEM_MENUSTART)
{
printf("Begin: ");
}
else if (event == EVENT_SYSTEM_MENUEND)
{
printf("End: ");
}
printf("%S\n", bstrName);
SysFreeString(bstrName);
pAcc->Release();
}
}
您是否知道如何修改此内容,以便在文本框得到关注时收到通知?任何解释都将不胜感激。
答案 0 :(得分:1)
您提供的代码会在菜单打开和关闭事件EVENT_SYSTEM_MENUSTART
以及EVENT_SYSTEM_MENUEND
上挂钩。
您应该尝试在EVENT_OBJECT_FOCUS
和EVENT_OBJECT_SELECT
中使用SetWinEventHook
(也许HandleWinEvent
。
void CALLBACK HandleWinEvent(HWINEVENTHOOK hook, DWORD event, HWND hwnd,
LONG idObject, LONG idChild,
DWORD dwEventThread, DWORD dwmsEventTime)
{
IAccessible* pAcc = NULL;
VARIANT varChild;
HRESULT hr = AccessibleObjectFromEvent(hwnd, idObject, idChild, &pAcc, &varChild);
BSTR bstrName;
pAcc->get_accName(varChild, &bstrName);
if (event == EVENT_OBJECT_FOCUS || event == EVENT_OBJECT_SELECTION)
{
printf("%S\n", bstrName);
}
}
void InitializeMSAA()
{
CoInitialize(NULL);
g_hook = SetWinEventHook(
EVENT_OBJECT_FOCUS, EVENT_OBJECT_SELECTION,
NULL, // Handle to DLL.
HandleWinEvent, // The callback.
0, 0, // Process and thread IDs of interest (0 = all)
WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS); // Flags.
}
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