hid_read() returning 0

[modhusudhan]

I am working on Win10 and Win11.
I am able to see that hid_write() is successful to the HID device, Device is also sending data back to the PC.
But when I try to read the data using hid_read(), the return is always 0.
hid_read() is inturn calling ReadFile()

Send and Receive data is 64 in length.

Using Qt 5.15, MinGW compiler with CMake.

Could anyone please help me

[Ihor Dutchak]

What version of HIDAPI do you use?
What kind of data does the Device is sending back?
Do you use the device in blocking or non-blocking mode?
Are you retrying in a loop?

Not enough info even try to answer you.

[modhusudhan]

What version of HIDAPI do you use? -->0.14.0
What kind of data does the Device is sending back?
It is a custom data from the device of 64 bytes. Product information to start with.
Do you use the device in blocking or non-blocking mode?
Tried in both the modes, behavior is the same
Are you retrying in a loop?
Yes

[modhusudhan]

Tried testing with hidapitester

HID details
  vendorId:      0x0483
  productId:     0x5750
  usagePage:     0x00FF
  usage:         0x0001
  serial_number: 48E054693455
  interface:     -1

..\hidapitester-windows-x86_64>hidapitester --vidpid 483 --usagePage 0x00FF --open --send-output 0xa3,0x91,0x20,0xdf --read-input
Opening device, vid/pid:0x0483/0x0000, usagePage/usage: FF/0
Device opened
Writing output report of 64-bytes...wrote 64 bytes:
 A3 91 20 DF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Reading 64-byte input report 0, 250 msec timeout...read 0 bytes:
Closing device

Can anyone guide me where to look further?

[Ihor Dutchak]

For starters I'd say you need to make sure your device is HID compliant and that the device really is sending an input report.

Unless you find an issue in HIDAPI, this is not a place to discuss device-specific development.
This is a HIDAPI issue tracker, not a support forum.

[modhusudhan]

I don't think there is a problem with the device.
using a sniffer I can see data for the command sent

And windows also detects the deivce

[mcuee]

@modhusudhan

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