I go here first time today.
wish guys to give help to me.
Now, I am able to send get index string to hid on windows.
Use HidD_GetIndexedString function on windows.

for example:
I have to send bytes arrays to hid adapter.
use HidD_GetIndexedString to do this.
Index value is 0x99 (3rd byte), index length is 0x15(7rd byte)
SO.bytes array as below:
CTL 80 06 99 03 09 04 17 00 GET_DESCRIPTOR.
On windows , the Codes work well.

But , i need to port this function to linux.

Now coding like this:
if(open("/dev/hiddev0", O_RDWR|O_NDELAY) != -1)
{
string_descriptor.index = 0x99;
ioctl(handle, HIDIOCGSTRING, &string_descriptor);
}
In fact, On linux
The Bytes array is:
CTL 80 06 99 03 09 04 66 00
This means that I can not to change index string length,
The fixed length is 0x64.
How to change index string length to 0x15 on linux.
What function is used????
Thank a lot......

Welcome to LQ!! (I closed your duplicate thread)

I assume you are working in a C environment.

Some of what you posted will not make sense unless the reader knows what header files you are using, and knows what a "hid adapter" is.

Yes, working in a C environment,
HID is a USB Class.
Usually, User does not need to know what it is really(usage/page), and is able to send severals types command.

for example:
GET_DESCRIPTOR,SET_DESCRIPTOR.......
The host attempts to enumerate the device by sending above control transfers command.
BusHound can capture all data stream during session.

Could anybody help me fix this problem........

.....My friends...