I need a toggle button so when a key is pressed it starts then stops when the key is

[Charade]

I need this to start when PageUp is pressed then stop when PageUp is pressed again. or only start when PgUp is held down then when the key isn't pressed, it stops


static int uiStartCb(Ihand le *ih) {
char buf[MSG_BUFSIZE];
UNREFERENCED_PA RAMETER(ih);
if (divertStart(Iu pGetAttribute(f ilterText, "VALUE"), buf) == 0) {
showStatus(buf) ;
return IUP_DEFAULT;
}

// successfully started
showStatus("Sta rted filtering. Enable functionalities to take effect. L");
IupSetAttribute (filterText, "ACTIVE", "NO");
IupSetAttribute (filterButton, "TITLE", "Stop");
IupSetCallback( filterButton, "ACTION", uiStopCb);
IupSetAttribute (timer, "RUN", "YES");
}
return IUP_DEFAULT;
}

static int uiStopCb(Ihandl e *ih) {
int ix;
UNREFERENCED_PA RAMETER(ih);

// try stopping
IupSetAttribute (filterButton, "ACTIVE", "NO");
IupFlush(); // flush to show disabled state
divertStop();

IupSetAttribute (filterText, "ACTIVE", "YES");
IupSetAttribute (filterButton, "TITLE", "Start");
IupSetAttribute (filterButton, "ACTIVE", "YES");
IupSetCallback( filterButton, "ACTION", uiStartCb);

// stop timer and clean up icons
IupSetAttribute (timer, "RUN", "NO");
for (ix = 0; ix < MODULE_CNT; ++ix) {
modules[ix]->processTrigger ed = 0; // use = here since is threads already stopped
IupSetAttribute (modules[ix]->iconHandle, "IMAGE", "none_icon" );
}
sendState = SEND_STATUS_NON E;
IupSetAttribute (stateIcon, "IMAGE", "none_icon" );

showStatus("Sto pped. To begin again, edit criteria and click Start.");
return IUP_DEFAULT;
}

static int uiToggleControl s(Ihandle *ih, int state) {
Ihandle *controls = (Ihandle*)IupGe tAttribute(ih, CONTROLS_HANDLE );
short *target = (short*)IupGetA ttribute(ih, SYNCED_VALUE);
int controlsActive = IupGetInt(contr ols, "ACTIVE");
if (controlsActive && !state) {
IupSetAttribute (controls, "ACTIVE", "NO");
InterlockedExch ange16(target, I2S(state));
} else if (!controlsActiv e && state) {
IupSetAttribute (controls, "ACTIVE", "YES");
InterlockedExch ange16(target, I2S(state));
}