DllOpen always return -1 for certain Dll files

[JohnWang]

Hello,

I am trying to use some function in MediaInfo.dll specifically the Inform function to get video bitrate. However, Dllopen function seems to always return -1. I have searched the forum and most people does not have problem using it and is incorporated in many scripts. I have redownloaded the dll file from another source but still the same thing. Here's the the test code I used: (I made sure MediaInfo.dll was located in C:\)

Dim $MediaInfo = @ScriptDir & "\Tools\MediaInfo\"

Func GetBitrate($iFile)
    Dim $MediaInfoDll = DllOpen("C:\MediaInfo.dll")
    MsgBox(0,"Error", $MediaInfoDll)
EndFunc   ;==>GetBitrate

GetBitrate("C:\Test1.mp4")

The return is always -1, I didn't try dllcall yet because dllOpen wouldn't work correctly, and Dllcall looks a bit complex to try to debug. Thanks.

[ProgAndy]

I think the dll is a 32-bit dll. If you are working on a 64bit-Machine, you have to take care and execute AutoIt as 32bit, too. Otherwise the script won't be able to open the DLL.

[JohnWang]

I think the dll is a 32-bit dll. If you are working on a 64bit-Machine, you have to take care and execute AutoIt as 32bit, too. Otherwise the script won't be able to open the DLL.

YES! That's exactly the problem, I just figured it out as well. Thanks for the prompt reply!

[KaFu]

I solved that problem... hmmmm, 3 times ? After the last time I ran into that error I added this to the top of my script:

If @AutoItX64 Then
    MsgBox(0, "Error", "SMF won't run as x64 => 32bit dll")
    Exit
EndIf