I'm trying to disable or hide a button in another application
I get the hndl of button but when I call SendMessage
[DllImport("user32.dll", SetLastError = true)]
public static extern bool SendMessage(IntPtr hWnd, uint Msg, int wParam,
bool lParam);
bool x = SendMessage(hndl, TB_HIDEBUTTON, 0, false);
nothing happens and x always returns false. I have also tried TB_DELETEBUTTON
You're sending the wrong message. Get a handle to the button, and call EnableWindow(hndl, FALSE); instead (or if you want to hide it, try ShowWindow(hndl, SW_HIDE);).
TB_HIDEBUTTON is a window message that used to hide the button in a toolbar. If you want to do this, there is something wrong with your code, you must provide the button identifer as the third parameter of SendMessage, go to link text for reference.
Here's an example for Internet Explorer 11 (called from dll injected into iexplore):
HWND Suchleiste = FindWindowEx(GetActiveWindow(), NULL, NULL, "Navigationsleiste"); // WorkerW
Suchleiste = FindWindowEx(Suchleiste, NULL, "ReBarWindow32", NULL);
AddressbarRight = FindWindowEx(Suchleiste, NULL, "ControlBandClass", NULL);
AddressbarRight = FindWindowEx(AddressbarRight, NULL, "ToolbarWindow32", NULL);
TBBUTTON tButton;
SendMessage(AddressbarRight, TB_GETBUTTON, 0, (LPARAM)&tButton); // 0 == Home button
SendMessage(AddressbarRight, TB_HIDEBUTTON, tButton.idCommand, (LPARAM)MAKELONG(TRUE, 0)); // idCommand == 1
//SendMessage(AddressbarRight, TB_ENABLEBUTTON, tButton.idCommand, (LPARAM)MAKELONG(FALSE, 0)); // makes it inactive
Everybody says to use "DestroyWindow" or "EnableWindow" or whatever. These buttons are not windows, if I interpret "inspect" and "spyxx_amd64" output correctly.
Events:
https://learn.microsoft.com/en-us/windows/win32/controls/toolbar-control-reference
Functions:
https://learn.microsoft.com/en-us/windows/win32/api/commctrl
The ImageList_ functions don't work correctly though. Like I call "ImageList_Remove":
HIMAGELIST mlist=(HIMAGELIST)::SendMessage(AddressbarRight, TB_GETIMAGELIST, 0, 0);
ImageList_Remove(mlist, 0);
but the button is still visible when I hover over it, looks broken though. But the event:
SendMessage(AddressbarRight, TB_DELETEBUTTON, 0, 0);
removes the icon completely. forever. Besides, if you use events, you don't need to link to "comctl32".
Beware when deleting buttons! The index decreases, so you delete index 0, index 1 takes its index (becoming 0). So when deleting several buttons, go backwards, starting with the highest index.
