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POhow to get vendor id and product id of a plugged usb device on windows
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  1. POhow to get vendor id and product id of a plugged usb device on windows
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    copied!<p>I am using Qt on windows platform.</p> <p>i want to get and display vendor id and product id of a plugged usb device from my local system.</p> <p>Below is my full source code to get the vendor id and product id from the usb device.</p> <p>when i run the my qt application it does not throw me any errors .</p> <p>so i plug the usb device into the system.</p> <p>but my print statement displays the result as below</p> <p><code>qDebug ()&lt;&lt;pDetData-&gt;DevicePath;</code></p> <p>i get the result as 0x4</p> <p>Whether i have any implementation mistakes in my source code ?</p> <p>if so please guide me what i am doing wrong..</p> <p>Have i missed out any other functions ?</p> <p>Is it possible to get the vendor id and product id from the usb device based on my source code .( my implementation of the code ) ?</p> <p>kindly find my source code below </p> <pre><code>static GUID GUID_DEVINTERFACE_USB_DEVICE = { 0xA5DCBF10L, 0x6530, 0x11D2, { 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED } }; HANDLE hInfo = SetupDiGetClassDevs(&amp;GUID_DEVINTERFACE_USB_DEVICE,NULL,NULL, DIGCF_PRESENT | DIGCF_INTERFACEDEVICE); if ( hInfo == INVALID_HANDLE_VALUE ) { qDebug ()&lt;&lt;"invalid"; } else { qDebug ()&lt;&lt;"valid handle"; SP_DEVINFO_DATA DeviceInfoData; DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA); SP_INTERFACE_DEVICE_DATA Interface_Info; Interface_Info.cbSize = sizeof(Interface_Info); BYTE Buf[1024]; DWORD i; DWORD InterfaceNumber= 0; PSP_DEVICE_INTERFACE_DETAIL_DATA pspdidd = (PSP_DEVICE_INTERFACE_DETAIL_DATA) Buf; for (i=0;SetupDiEnumDeviceInfo(hInfo,i,&amp;DeviceInfoData);i++) { DWORD DataT; LPTSTR buffer = NULL; DWORD buffersize = 0; while (!SetupDiGetDeviceRegistryProperty( hInfo, &amp;DeviceInfoData, SPDRP_DEVICEDESC, &amp;DataT, (PBYTE)buffer, buffersize, &amp;buffersize)) { if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) { // Change the buffer size. if (buffer) LocalFree(buffer); buffer = (LPTSTR)LocalAlloc(LPTR,buffersize); } else { // Insert error handling here. break; } qDebug ()&lt;&lt;(TEXT("Device Number %i is: %s\n"),i, buffer); if (buffer) LocalFree(buffer); if ( GetLastError() != NO_ERROR &amp;&amp; GetLastError() != ERROR_NO_MORE_ITEMS ) { // Insert error handling here. qDebug ()&lt;&lt;"return false"; } InterfaceNumber = 0; // this just returns the first one, you can iterate on this if (SetupDiEnumDeviceInterfaces(hInfo, NULL, &amp;GUID_DEVINTERFACE_USB_DEVICE, InterfaceNumber, &amp;Interface_Info)) { printf("Got interface"); DWORD needed; pspdidd-&gt;cbSize = sizeof(*pspdidd); SP_DEVICE_INTERFACE_DETAIL_DATA *pDetData = NULL; DWORD dwDetDataSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA) + 256; SetupDiGetDeviceInterfaceDetail(hInfo, &amp;Interface_Info, pDetData,dwDetDataSize, NULL, &amp;DeviceInfoData); qDebug ()&lt;&lt;pDetData-&gt;DevicePath; //qDebug ()&lt;&lt;QString::fromWCharArray(pDetData-&gt;DevicePath); } else { printf("\nNo interface"); //ErrorExit((LPTSTR) "SetupDiEnumDeviceInterfaces"); if ( GetLastError() == ERROR_NO_MORE_ITEMS) printf(", since there are no more items found."); else printf(", unknown reason."); } // Cleanup SetupDiDestroyDeviceInfoList(hInfo); qDebug ()&lt;&lt;"return true"; } } } </code></pre> <p><strong>--------------- Edited to add: -----------------</strong></p> <p>Hi... the application comes and prints this</p> <blockquote> <p>\?\usb#vid_04f2&amp;pid_0111#5&amp;1ba5a77f&amp;0&amp;2#{a5dcbf1 0-6530-11d2-901f-00c04fb951ed}</p> </blockquote> <p>again it goes to while loop .... here it gets breaked in the else statement... </p> <p>Qt Code: </p> <pre><code>if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) { // Change the buffer size. if (buffer) LocalFree(buffer); buffer = (LPTSTR)LocalAlloc(LPTR,buffersize); } else { qDebug ()&lt;&lt;"Here it quits the application"; // Insert error handling here. break; } </code></pre> <p>Any ideas in this.... </p>
 

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