Mega Code Archive
Force the foreground window
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Title: Force the foreground window
Question: Windows 98/2000 doesn't want to foreground a window when some other window has the keyboard focus.
ForceForegroundWindow is an enhanced SetForeGroundWindow function.
Answer:
function ForceForegroundWindow(wnd: THandle): Boolean;
const
SPI_GETFOREGROUNDLOCKTIMEOUT = $2000;
SPI_SETFOREGROUNDLOCKTIMEOUT = $2001;
var
ForegroundThreadID: DWORD;
ThisThreadID: DWORD;
timeout: DWORD;
begin
if IsIconic(wnd) then ShowWindow(wnd, SW_RESTORE);
if GetForegroundWindow = wnd then Result := True
else
begin
// Windows 98/2000 doesn't want to foreground a window when some other
// window has keyboard focus
if ((Win32Platform = VER_PLATFORM_WIN32_NT) and (Win32MajorVersion 4)) or
((Win32Platform = VER_PLATFORM_WIN32_WINDOWS) and
((Win32MajorVersion 4) or ((Win32MajorVersion = 4) and
(Win32MinorVersion 0)))) then
begin
// Code from Karl E. Peterson, www.mvps.org/vb/sample.htm
// Converted to Delphi by Ray Lischner
// Published in The Delphi Magazine 55, page 16
Result := False;
ForegroundThreadID := GetWindowThreadProcessID(GetForegroundWindow, nil);
ThisThreadID := GetWindowThreadPRocessId(wnd, nil);
if AttachThreadInput(ThisThreadID, ForegroundThreadID, True) then
begin
BringWindowToTop(wnd); // IE 5.5 related hack
SetForegroundWindow(wnd);
AttachThreadInput(ThisThreadID, ForegroundThreadID, False);
Result := (GetForegroundWindow = wnd);
end;
if not Result then
begin
// Code by Daniel P. Stasinski
SystemParametersInfo(SPI_GETFOREGROUNDLOCKTIMEOUT, 0, @timeout, 0);
SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT, 0, TObject(0),
SPIF_SENDCHANGE);
BringWindowToTop(wnd); // IE 5.5 related hack
SetForegroundWindow(Wnd);
SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT, 0,
TObject(timeout), SPIF_SENDCHANGE);
end;
end
else
begin
BringWindowToTop(wnd); // IE 5.5 related hack
SetForegroundWindow(wnd);
end;
Result := (GetForegroundWindow = wnd);
end;
end; { ForceForegroundWindow }
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