Urmeaza probabil cea mai avansata tehnica pe care ai vazut-o in VB. Nu ti-au spus “expertii” ca nu poti face “low level programming” in Visual Basic, ceea ce poti face in C/C++/ASM? Aici o sa le demonstram ca gresesc. Acest mic cod va demonstra cum sa executi un cod masina inVB pentru a afisa numele CPU.

Tot ce trebuie sa faci este sa dai copy / paste la codul urmator intr-un form:

Private Declare Function CallWindowProc Lib “user32″ Alias “CallWindowProcA” ( _
ByVal lpPrevWndFunc As Long, ByVal hWnd As Long, ByVal Msg As Long, _
ByVal wParam As Long, ByVal lParam As Long) As Long

Public Function GetCpuName() As String

Dim MachineCode(0 To 35) As Byte
Dim VarAddr As Long
Dim EAX As Long
Dim CPUName(1 To 12) As Byte

‘set up machine code

MachineCode(0) = &H55 ‘push ebp
MachineCode(1) = &H8B ‘move ebp,esp
MachineCode(2) = &HEC
MachineCode(3) = &H57 ‘push edi
MachineCode(4) = &H52 ‘push edx
MachineCode(5) = &H51 ‘push ecx
MachineCode(6) = &H53 ‘push ebx
MachineCode(7) = &H8B ‘move eax,dword ptr [ebp+8]
MachineCode(8) = &H45
MachineCode(9) = &H8
MachineCode(10) = &HF ‘cpuid
MachineCode(11) = &HA2
MachineCode(12) = &H8B ‘mov edi,dword ptr [ebp+12]
MachineCode(13) = &H7D
MachineCode(14) = &HC
MachineCode(15) = &H89 ‘move dword ptr [edi],ebx
MachineCode(16) = &H1F
MachineCode(17) = &H8B ‘mov edi,dword ptr [ebp+16]
MachineCode(18) = &H7D
MachineCode(19) = &H10
MachineCode(20) = &H89 ‘move dword ptr [edi],ecx
MachineCode(21) = &HF
MachineCode(22) = &H8B ‘mov edi,dword ptr [ebp+20]
MachineCode(23) = &H7D
MachineCode(24) = &H14
MachineCode(25) = &H89 ‘move dword ptr [edi],edx
MachineCode(26) = &H17
MachineCode(27) = &H58 ‘pop ebx
MachineCode(28) = &H59 ‘pop ecx
MachineCode(29) = &H5A ‘pop edx
MachineCode(30) = &H55 ‘pop edi
MachineCode(31) = &HC9 ‘leave
MachineCode(32) = &HC2 ‘ret 16 I tried everything from 0 to 24
MachineCode(33) = &H10 ‘ but all produce the stack error
MachineCode(34) = &H0
‘tell cpuid what we want
EAX = 0

CallWindowProc VarPtr(MachineCode(0)), EAX, VarPtr(CPUName(1)), VarPtr(CPUName(9)), VarPtr(CPUName(5))
GetCpuName = StrConv(CPUName(), vbUnicode) ‘UnicodeName
End Function

Private Sub Form_Load()
MsgBox GetCpuName
End Sub