The following is the content of the program:

//test. The asm
EXTERN g_iValue: DQ; Refer to external variable
.data
Val1 DQ? ; Define your own variable

The CODE
PebIsDebuggedApproach PROC

Mov eax, fs: [h] 30
Mov al, BYTE PTR [eax + 2]
Ret.

PebIsDebuggedApproach ENDP

END

//test. The CPP
Extern "C" bool __stdcall PebIsDebuggedApproach ();
Extern "C"//prevent function by name mangling
{
Char g_iValue=https://bbs.csdn.net/topics/0;
}

Int main ()
{
Int t=PebIsDebuggedApproach ();
getchar();
}

After the above execution is collapsed program

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