00405A71 > JMP UN.004056C5 --->

004056C5 > CALL UN.00405C64
004056CA AND EAX,0FF
004056CF TEST EAX,EAX
004056D1 JE UN.00405A76 --->
004056D7 PUSH 3E8
004056DC MOV EDX,DWORD PTR SS:[EBP-A4]
004056E2 PUSH EDX
004056E3 CALL <&KERNEL32.WaitForDebugEvent>
004056E9 TEST EAX,EAX
~~~~~~~~~~~~
When use SICE debug the code,
the eax return value is always 0,
in other words,this code have not
the debugEvent.How sto Solve it?
004056EB JE UN.00405A71 --->

Just a thought by why not just toggle the Z flag?

I have try it,but it is no use.

>...the eax return value is always 0,...
>

What GetLastError() says?
Neviens.