philippmeisberger / zfmsdk Goto Github PK

If the .dll was compiled by Lazarus (1.6.4 with FPC 3.0.2) on Windows and ZfmUpImage() is called by a .NET console application after ZfmGenImg() has read the fingerprint an AV is thrown. The AV does not occur if the .dll was compiled by Delphi XE8.

The AV occurs when accessing the TBitmap instance with a write operation like setting Width or Height properties. At this point the image has been downloaded successfully from ZFM. The TBitmap instance is assigned and e.g. reading Width property works like a charm.

I have no idea what is going wrong there and why this AV is thrown. Any help would be appreciated.

He Philipp,

Hope everything is alright for you, I try to use your lib but the dllimport code does not work.

in zfmsdk/lib/Zfm.cs

[DllImport("Zfm.dll", EntryPoint = "ZfmInitialize", CallingConvention = CallingConvention.Cdecl)]

Cant find the "Zfm.dll" could you please tell me about it

I want to download scanned fingerprint image using USB interface instead of UART because UART communication takes about 4 to 5 seconds to save Image on PC...It is very slow... So I want to use USB interface directly... How can I do this... ? I solder USB cable on USB pins of Sensor (VCC D- D+ GND) and connect sensor to my PC... Now how can I use the sensor to get fingerprint image.... Please help me