Get USB bus reported device description in qt

[vakh]

how can we get USB bus reported device description in Qt?

I searched in google and saw some functions like SetupDiGetDeviceProperty in windows.h or maybe setupapi.h. but i don't know how can use it in Qt.

[JonB]

@vakh
As you say, this doubtless is not available from Qt libraries and you need to call some Windows SDK function.

Qt/C++ programs can call Windows SDK functions like any other function which happens to be written in C. Just make sure:

• You #include the necessary Windows .h file, e.g. maybe #include <windows.h>. Qt may already be including this, I don't know.

• You link with the necessary Windows .lib files. Again I suspect Qt may already be doing this.

However I see SetupDiGetDevicePropertyW function (setupapi.h) is in setupapi.h and that is inside Device and Driver Installation Reference. I do not know whether that is available in a normal, non-driver-installation program.

[vakh]

thanks a lot. I finally found how to use this library. this is my code:

#include <string>
#include <windows.h>
#include <setupapi.h>
#include <initguid.h>
#include <devguid.h>
#include <hidsdi.h>

uint8_t valid_ports_counter =0;
// Check Device Bus Reported Device Description
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData = { sizeof(DeviceInfoData) };

// Get device class information handle
hDevInfo = SetupDiGetClassDevs(&GUID_DEVCLASS_PORTS, 0, 0, DIGCF_PRESENT);
if (hDevInfo != INVALID_HANDLE_VALUE)
{
	const int BUFFER_SIZE = 1024;
	BYTE ptrBuf[BUFFER_SIZE];
	static DEVPROPKEY *DEVPKEY_Device_BusReportedDeviceDesc;
	DEVPKEY_Device_BusReportedDeviceDesc = new DEVPROPKEY();
	DEVPKEY_Device_BusReportedDeviceDesc->fmtid.Data1 = 0x540b947e;
	DEVPKEY_Device_BusReportedDeviceDesc->fmtid.Data2 = 0x8b40;
	DEVPKEY_Device_BusReportedDeviceDesc->fmtid.Data3 = 0x45bc;
	DEVPKEY_Device_BusReportedDeviceDesc->fmtid.Data4[0] = 0xa8;
	DEVPKEY_Device_BusReportedDeviceDesc->fmtid.Data4[1] = 0xa2;
	DEVPKEY_Device_BusReportedDeviceDesc->fmtid.Data4[2] = 0x6a;
	DEVPKEY_Device_BusReportedDeviceDesc->fmtid.Data4[3] = 0x0b;
	DEVPKEY_Device_BusReportedDeviceDesc->fmtid.Data4[4] = 0x89;
	DEVPKEY_Device_BusReportedDeviceDesc->fmtid.Data4[5] = 0x4c;
	DEVPKEY_Device_BusReportedDeviceDesc->fmtid.Data4[6] = 0xbd;
	DEVPKEY_Device_BusReportedDeviceDesc->fmtid.Data4[7] = 0xa2;
	DEVPKEY_Device_BusReportedDeviceDesc->pid = 4;
	DEVPROPTYPE propRegDataType;
	// enumerute device information
	for (int i = 0; SetupDiEnumDeviceInfo(hDevInfo, i, &DeviceInfoData); i++)
	{
		DWORD req_bufsize = 0;
		if (SetupDiGetDevicePropertyW(hDevInfo, &DeviceInfoData, DEVPKEY_Device_BusReportedDeviceDesc,
									  &propRegDataType, ptrBuf, BUFFER_SIZE, &req_bufsize, 0))
		{
			// BYTE to char
			QString port_name;
			for(uint16_t i = 0; i < (req_bufsize-2); i += 2)
				port_name.push_back(static_cast<QChar>(ptrBuf[i]));
			if(port_name == "###")
			{
				DWORD DataT;
				char friendly_name[2046] = { 0 };
				DWORD buffersize = 2046;
				// get device description information
				if (SetupDiGetDeviceRegistryPropertyA(hDevInfo, &DeviceInfoData, SPDRP_FRIENDLYNAME, &DataT, (PBYTE)friendly_name, buffersize, &req_bufsize))
				{
					QString com_port = friendly_name;
					com_port = com_port.sliced(com_port.indexOf('(') + 1, com_port.indexOf(')') - com_port.indexOf('(') - 1);
					valid_ports_counter++;
					COMInfo comi;
					comi.type = COM_MCB;
					comi.name = com_port;
					ports_type.push_back(comi);
					ui->comboBox_ports->addItem(com_port);
					QPixmap pusb(":/files/USB.png");
					QIcon iusb(pusb);
					ui->comboBox_ports->setItemIcon(ui->comboBox_ports->count() - 1, iusb);
				}
			}
		}
	}
}