GetDllBitness()

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TLM
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GetDllBitness()

13 Jan 2020, 14:29

whipped it up quick, placed here for reference..
GetDllBitness()
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TLM
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Re: GetDllBitness()

13 Jan 2020, 14:53

Updated the API call as it was incorrect.
malcev
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Re: GetDllBitness()

13 Jan 2020, 15:14

You can do it without imagehlp.dll

Code: Select all

oFile := FileOpen(DllPath, "r")
oFile.Seek(0x3c)
oFile.Seek(oFile.ReadInt()+4)
machineType := oFile.ReadUShort()
oFile.Close()
if (machineType = 0x14c)
   msgbox 32 bit
if (machineType = 0x8664) or (machineType = 0x200)
   msgbox 64 bit
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TLM
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Re: GetDllBitness()

13 Jan 2020, 15:23

:) yah I was aware but figured using the api call would be somehow "cleaner" lol
also wouldn't oFile.ReadInt()+A_PtrSize be more compliant? *wonderin
malcev
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Re: GetDllBitness()

13 Jan 2020, 15:40

No. Because
After the MS-DOS stub, at the file offset specified at offset 0x3c, is a 4-byte signature that identifies the file as a PE format image file.
https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#signature-image-only
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Delta Pythagorean
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Re: GetDllBitness()

13 Jan 2020, 18:13

What exactly does this do and what is it for?
gregster
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Re: GetDllBitness()

13 Jan 2020, 18:38

Delta Pythagorean wrote:
13 Jan 2020, 18:13
What exactly does this do and what is it for?
Based on the function's name, the example and the description (scroll down in the code window), I would suppose that it determines, if a specific dll-file is a 64 or a 32 bit library. ("It gets the bitness of a DLL").
Application case: As you might know, you can't use 64 bit DLLs on 32 bit Windows operating systems - so how do you determine programmatically, for example, if the user downloaded the right DLL version for a certain task?
Description: Returns a dll's bitness.
Parameters:
dll: The full path of the dll whose bitness is to be determined.
warn (optional): Displays a message if the dll is invalid then exits.
Return value: The return value is a nonzero number.
Helgef
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Re: GetDllBitness()

16 Jan 2020, 12:15

Hi, if the else branch is executed you do not free the loaded dll. In any case, it is not necessary to load it manually as dllcall will do it for you automatically if needed. See :arrow: dllcall - performance.

Thanks for sharing, cheers.
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TLM
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Re: GetDllBitness()

16 Jan 2020, 12:35

Thanks @Helgef
By `load it` do you mean explicit load of the imagehlp library? If so, my script crashes without it.
swagfag
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Re: GetDllBitness()

16 Jan 2020, 13:17

arent u also supposed to eventually UnMapAndLoad if ure gonna use this dllcall?
Helgef
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Re: GetDllBitness()

16 Jan 2020, 13:21

Sorry, I see you do a double numget, which means that you dereference something allocated by the dll, so indeed you need to load it explicitly and cannot rely on dllcall to do it for you.
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TLM
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Re: GetDllBitness()

17 Jan 2020, 10:52

I really did rush through this one.
Thanks guys, updated.

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