Being very helpful, MSVC has reported saying that CreateEffect failed with the return code -1072627707. Now I have no bloody idea what this code is, what it means, where it comes from, or how to fix it. I haven't be able to pick a scrap of info on it and it doesn't match any DIERR_* define that I know of.

Here's the DIEFFECT and DIPERIODIC structures that I passed:

DIEFFECT:

dwSize = 56;
dwFlags = 18;
dwDuration = INFINITE;
dwGain = DI_FFNOMINALMAX;
dwTriggerButton = DIEB_NOTRIGGER;
dwTriggerRepeatInterval = 0;
rdgwAxes = <pntr to {0, 4}>
rdlDirection = <pntr to {10000, 10000}>
lpEnvelope = NULL;
cbTypeSpecificParams = sizeof(DIPERIODIC);
lpvTypeSpecificParams = <pntr to my DIPERODIC struct>;


DIPERIODIC:

dwMagnitude = 6499;
lOffset = 0;
dwPhase = 1000000;
dwPeriod = 35999;

I then create the effect with:
->CreateEffect(GUID_Sine, <pntr to my DIEFFECT instance>, <pntr to repository address for pntr to effect handle>, NULL);

And then it fails and dumps -1072627707 onto me.

Help. D: