monitor a posted window msg using windbg

msgmon.wds

.if (not(${/d:$arg1}))
{
	.echo Usage:
	.echo " $$>a<${$arg0} msg [hwnd]"
	.echo " Specify the msg you want to check. You could specify the hwnd as well"
	.echo ""
	.echo Example:
	.echo " $$>a<${$arg0} 400 1a0396			# monitor msg WM_USER (0x400) for window 0x1a0396"
	.echo " $$>a<${$arg0} 1					# monitor msg WM_CREATE (0x1) for all windows in current process"
}
.else
{
	.if (${/d:$arg2})
	{
		bp USER32!NtUserGetMessage+0xc "j(poi(poi(esp+4)+4)==${$arg1} & (poi(poi(esp+4))==${$arg2})) '.echo;kL;g';'g'"
		bp USER32!NtUserPeekMessage+0xc "j(poi(poi(esp+4)+4)==${$arg1} & (poi(esp+14)&1) & (poi(poi(esp+4))==${$arg2})) '.echo;kL;g';'g'"
		bp USER32!DispatchMessageW+0xc "j(poi(poi(esp+4)+4)==${$arg1} & (poi(poi(esp+4))==${$arg2})) '.echo;kL;g';'g'"
	}
	.else
	{
		bp USER32!NtUserGetMessage+0xc "j(poi(poi(esp+4)+4)==${$arg1}) '.echo;kL;g';'g'"
		bp USER32!NtUserPeekMessage+0xc "j(poi(poi(esp+4)+4)==${$arg1} & (poi(esp+14)&1)) '.echo;kL;g';'g'"
		bp user32!DispatchMessageW "j(poi(poi(esp+4)+4)==${$arg1}) '.echo;kL;g';'g'"
	}
	
	bl
}