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copied!<p>After this line:</p> <pre><code>SP_DEVICE_INTERFACE_DETAIL_DATA *pDetData = NULL; </code></pre> <p>Add this:</p> <pre><code>DWORD dwDetDataSize = sizeof (SP_DEVICE_INTERFACE_DETAIL_DATA) + 256; pDetData = (_SP_DEVICE_INTERFACE_DETAIL_DATA_A*) malloc (dwDetDataSize); pDetData->cbSize = sizeof (SP_DEVICE_INTERFACE_DETAIL_DATA); </code></pre> <p>After this line:</p> <pre><code>qDebug ()<<pDetData->DevicePath; </code></pre> <p>Add this:</p> <pre><code>free(pDetData); </code></pre> <p>But eventually you're going to have to read the docs for <a href="http://msdn.microsoft.com/en-us/library/ff551120%28VS.85%29.aspx" rel="nofollow noreferrer"><code>SetupDiGetDeviceInterfaceDetail()</code></a>. Do it, there are lots of functions that work like this, with pointers to variable-size structs.</p> <p><strong>-------- Edited to add: --------</strong></p> <p>You're really going about this the wrong way. I see you're following the advice you got <a href="http://www.qtcentre.org/threads/31090-How-to-get-vendor-id-and-product-id-of-a-USB-device-on-windows-system" rel="nofollow noreferrer">here</a>, and it's taken you down the wrong path. <code>idVendor</code> and <code>idProduct</code> can only be found in the <code>USB_DEVICE_DESCRIPTOR</code> (<a href="http://msdn.microsoft.com/en-us/library/ff539280.aspx" rel="nofollow noreferrer">MSDN</a>).</p> <p>It looks like you already know how to get the device handle (using <code>CreateFile()</code>). After that, you call <code>WinUsb_Initialize()</code> (<a href="http://msdn.microsoft.com/en-us/library/ff540277.aspx" rel="nofollow noreferrer">MSDN</a>). That gets you a <code>WINUSB_INTERFACE_HANDLE</code>.</p> <p>Once you have that handle, you want to call <code>WinUsb_GetDescriptor()</code> (<a href="http://msdn.microsoft.com/en-us/library/ff540257.aspx" rel="nofollow noreferrer">MSDN</a>), with the <code>DescriptorType</code> set to <code>URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE</code>. I can't test code now, but it will look something like this:</p> <pre><code>USB_DEVICE_DESCRIPTOR udd; memset(&udd, 0, sizeof(udd)); ULONG LengthTransferred = 0; WinUsb_GetDescriptor( winusb_interface_handle, // returned by WinUsbInitialize URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE, 0, // not sure if we need this 0x409, // not sure if we need this &udd, sizeof(udd), &LengthTransferred); </code></pre> <p>After that, <code>udd->idVendor</code> and <code>udd->idProduct</code> should have what you want.</p> <p>Microsoft used to supply sample code for all this in the DDK, and probably still does, but I don't have access to one.</p> <p><strong>---------- Edited to add: ----------</strong></p> <p>Daniel K writes that the code should really be:</p> <pre><code>USB_DEVICE_DESCRIPTOR udd; memset(&udd, 0, sizeof(udd)); ULONG LengthTransferred = 0; WinUsb_GetDescriptor( winusb_interface_handle, // returned by WinUsbInitialize USB_DEVICE_DESCRIPTOR_TYPE, // Daniel K's suggestion 0, 0x409, // asks for English &udd, sizeof(udd), &LengthTransferred); </code></pre> <p>See the comments for further details.</p>

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