How to get vendor id and product id of a USB device on windows system

[newb]

. . . .

[newb]

Hi...

the application comes and prints this

"\\?\usb#vid_04f2&pid_0111#5&1ba5a77f&0&2#{a5dcbf1 0-6530-11d2-901f-00c04fb951ed}"

again it goes to while loop ....

here it gets breaked in the else statement...

if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
 {
            // Change the buffer size.
           if (buffer) LocalFree(buffer);
 
           buffer = (LPTSTR)LocalAlloc(LPTR,buffersize);
 
}
 
else
{
     qDebug ()<<"Here it quits the application";
 
    // Insert error handling here.
   break;
 
 }

if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
 {
            // Change the buffer size.
           if (buffer) LocalFree(buffer);

           buffer = (LPTSTR)LocalAlloc(LPTR,buffersize);

}

else
{
     qDebug ()<<"Here it quits the application";

    // Insert error handling here.
   break;

 }

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Any ideas in this....

[newb]

Hello Qt Experts....

Kindly guide me on my problem...

[squidge]

Say, did you write that code or copy it from somewhere? As you don't seem to understand how it works?

Secondly, why are you expecting the call to fail with an insufficient buffer error code? Surely having a sufficient buffer size is a good thing, rather than a bad one?

[newb]

Actually i want to get the vendor id and product id of a usb device which is get plugged....

i searched for Qt related implementation but i don seem to get any sample source code .

So i searched forums and links for that..

so i referred the links and followed the code they have used ..

Any ideas

[squidge]

Ok, well if you use what I say in post #8, that will tell you when a device is plugged/unplugged, which seems to be what you want.

If you google it, there will no doubt be lots of other people who have used it, and thus example code.