Root > Reference > All Functions > GetFunctionSize

Function GetFunctionSize

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Returns size of the function in bytes.

 

Unit

EDisAsm

 

Syntax

 

Code (Delphi)

function GetFunctionSize(

const AAddr: Pointer;

const AMaxSize: Cardinal

): Cardinal;

 

Parameters

AAddr

A pointer to function.

 

AMaxSize

Maximum possible size to scan. Use this to limit scan area and prevent unlimited reading.

 

Return value

Size of function at AAddr in bytes. This value is always in range 0..AMaxSize.

 

Exceptions

System.SysUtils.EAccessViolation

Invalid address or invalid code.

 

Remarks

GetFunctionSize scans machine code at AAddr address up to AAddr + AMaxSize. It stops at first ret instrution and returns distance between AAddr and end of ret.

 

This function is used in hooks and disassembler-related code.

 

Note

Make sure that you pass a pointer to a real function. Not to some arbitrary code or function's stub.

 

Use to get pointer to real code from stub.

 

Warning

This is heuristic function. Results are not 100% reliable.

 

See also

GetAsmSize



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Last edited: 2018-11-26
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