【发布时间】：2015-11-20 17:50:19
【问题描述】：
我关注了一些资源，包括 this 一个资源，我可以在其中检索 USB 设备的 pid、vid 等属性，但我需要检索“设备实例路径”，因为它包含序列号（最后 4数字），这最终是我想要的。
我尝试使用来自here 的代码来检索序列号，但它适用于 USB 存储设备，我的是一个独立设备，它具有类似于相机的 USB 连接。
QString USBDevices::findDevice()
{
GUID*pClassGuid = NULL;
LPCTSTR pszEnumerator = TEXT("USB");
unsigned i, j;
DWORD dwSize, dwPropertyRegDataType;
DEVPROPTYPE ulPropertyType;
CONFIGRET status;
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
const static LPCTSTR arPrefix[3] = {TEXT("VID_"), TEXT("PID_"), TEXT("MI_")};
TCHAR szDeviceInstanceID [MAX_DEVICE_ID_LEN];
TCHAR szDesc[1024], szHardwareIDs[4096];
WCHAR szBuffer[4096];
LPTSTR pszToken, pszNextToken;
TCHAR szVid[MAX_DEVICE_ID_LEN], szPid[MAX_DEVICE_ID_LEN], szMi[MAX_DEVICE_ID_LEN];
FN_SetupDiGetDevicePropertyW fn_SetupDiGetDevicePropertyW = (FN_SetupDiGetDevicePropertyW)
GetProcAddress (GetModuleHandle (TEXT("Setupapi.dll")), "SetupDiGetDevicePropertyW");
// List all connected USB devices
hDevInfo = SetupDiGetClassDevs (pClassGuid, pszEnumerator, NULL,
pClassGuid != NULL ? DIGCF_PRESENT: DIGCF_ALLCLASSES | DIGCF_PRESENT);
//hDevInfo = SetupDiGetClassDevs(NULL,0,0, DIGCF_PRESENT | DIGCF_ALLCLASSES | DIGCF_DEVICEINTERFACE);
if (hDevInfo == INVALID_HANDLE_VALUE)
return "";
// Find the ones that are driverless
for (i = 0; ; i++) {
DeviceInfoData.cbSize = sizeof (DeviceInfoData);
if (!SetupDiEnumDeviceInfo(hDevInfo, i, &DeviceInfoData))
break;
status = CM_Get_Device_ID(DeviceInfoData.DevInst, szDeviceInstanceID , MAX_PATH, 0);
if (status != CR_SUCCESS)
continue;
// Display device instance ID
qDebug() << QString::fromWCharArray(szDeviceInstanceID);
if (SetupDiGetDeviceRegistryProperty (hDevInfo, &DeviceInfoData, SPDRP_DEVICEDESC,
&dwPropertyRegDataType, (BYTE*)szDesc,
sizeof(szDesc), // The size, in bytes
&dwSize))
qDebug() << " Device Description: " << QString::fromWCharArray(szDesc);
if (SetupDiGetDeviceRegistryProperty (hDevInfo, &DeviceInfoData, SPDRP_HARDWAREID,
&dwPropertyRegDataType, (BYTE*)szHardwareIDs,
sizeof(szHardwareIDs), // The size, in bytes
&dwSize)) {
LPCTSTR pszId;
qDebug() << " Hardware IDs:\n";
for (pszId=szHardwareIDs;
*pszId != TEXT('\0') && pszId + dwSize/sizeof(TCHAR) <= szHardwareIDs + ARRAYSIZE(szHardwareIDs);
pszId += lstrlen(pszId)+1) {
qDebug() << QString::fromWCharArray(pszId);
}
}
// Retreive the device description as reported by the device itself
// On Vista and earlier, we can use only SPDRP_DEVICEDESC
// On Windows 7, the information we want ("Bus reported device description") is
// accessed through DEVPKEY_Device_BusReportedDeviceDesc
if (fn_SetupDiGetDevicePropertyW && fn_SetupDiGetDevicePropertyW (hDevInfo, &DeviceInfoData, &DEVPKEY_Device_BusReportedDeviceDesc,
&ulPropertyType, (BYTE*)szBuffer, sizeof(szBuffer), &dwSize, 0)) {
if (fn_SetupDiGetDevicePropertyW (hDevInfo, &DeviceInfoData, &DEVPKEY_Device_BusReportedDeviceDesc,
&ulPropertyType, (BYTE*)szBuffer, sizeof(szBuffer), &dwSize, 0))
{
QString busReportedDeviceDescription = QString::fromWCharArray(szBuffer);
qDebug() << " Bus Reported Device Description: " << QString::fromWCharArray(szBuffer);
if ( busReportedDeviceDescription == MY_DEVICE )
{
qDebug() << getSerialNum( hDevInfo );
return busReportedDeviceDescription;
}
}
if (fn_SetupDiGetDevicePropertyW (hDevInfo, &DeviceInfoData, &DEVPKEY_Device_Manufacturer,
&ulPropertyType, (BYTE*)szBuffer, sizeof(szBuffer), &dwSize, 0)) {
qDebug() << " Device Manufacturer: " << QString::fromWCharArray(szBuffer);
}
if (fn_SetupDiGetDevicePropertyW (hDevInfo, &DeviceInfoData, &DEVPKEY_Device_FriendlyName,
&ulPropertyType, (BYTE*)szBuffer, sizeof(szBuffer), &dwSize, 0)) {
qDebug() << " Device Friendly Name: " << QString::fromWCharArray(szBuffer);
}
if (fn_SetupDiGetDevicePropertyW (hDevInfo, &DeviceInfoData, &DEVPKEY_Device_LocationInfo,
&ulPropertyType, (BYTE*)szBuffer, sizeof(szBuffer), &dwSize, 0)) {
qDebug() << " Device Location Info: " << QString::fromWCharArray(szBuffer);
}
if (fn_SetupDiGetDevicePropertyW (hDevInfo, &DeviceInfoData, &DEVPKEY_Device_SecuritySDS,
&ulPropertyType, (BYTE*)szBuffer, sizeof(szBuffer), &dwSize, 0)) {
// See Security Descriptor Definition Language on MSDN
// (http://msdn.microsoft.com/en-us/library/windows/desktop/aa379567(v=vs.85).aspx)
qDebug() << " Device Security Descriptor String: " << QString::fromWCharArray(szBuffer);
}
if (fn_SetupDiGetDevicePropertyW (hDevInfo, &DeviceInfoData, &DEVPKEY_Device_ContainerId,
&ulPropertyType, (BYTE*)szDesc, sizeof(szDesc), &dwSize, 0)) {
StringFromGUID2((REFGUID)szDesc, szBuffer, ARRAY_SIZE(szBuffer));
qDebug() << " ContainerId: " << QString::fromWCharArray(szBuffer);
}
if (fn_SetupDiGetDevicePropertyW (hDevInfo, &DeviceInfoData, &DEVPKEY_DeviceDisplay_Category,
&ulPropertyType, (BYTE*)szBuffer, sizeof(szBuffer), &dwSize, 0))
qDebug() << " Device Display Category: " << QString::fromWCharArray(szBuffer);
}
QString deviceInstanceID( QString::fromWCharArray( szDeviceInstanceID ) );
QRegExp splitBy("(\\\\|\\&|\\#)");
QStringList deviceInstanceIDItems = deviceInstanceID.split(splitBy);
QString vid;
QString pid;
QString mi;
if (deviceInstanceIDItems.count() > 1)
vid = deviceInstanceIDItems[1].contains("VID_") ? deviceInstanceIDItems[1] : "";
if (deviceInstanceIDItems.count() > 2)
pid = deviceInstanceIDItems[2].contains("PID_") ? deviceInstanceIDItems[2] : "";
if (deviceInstanceIDItems.count() > 3)
mi = deviceInstanceIDItems[3].contains("MI_") ? deviceInstanceIDItems[3] : "";
if (!vid.isEmpty())
qDebug() << " vid: " << vid;
if (!pid.isEmpty())
qDebug() << " pid: " << pid;
if (!mi.isEmpty())
qDebug() << " mi: " << mi;
}
return "";
}
QString USBDevices::getSerialNum(HDEVINFO hDevInfo)
{
// Get a context structure for the device interface
// of a device information set.
BYTE Buf[1024];
PSP_DEVICE_INTERFACE_DETAIL_DATA pspdidd =
(PSP_DEVICE_INTERFACE_DETAIL_DATA)Buf;
SP_DEVICE_INTERFACE_DATA spdid;
SP_DEVINFO_DATA spdd;
spdid.cbSize = sizeof( spdid );
DWORD dwIndex = 0;
while ( true )
{
if ( ! SetupDiEnumDeviceInterfaces( hDevInfo, NULL,
//&GUID_DEVINTERFACE_USB_DISK,
&my_guid,
dwIndex, &spdid ))
{
qDebug() << "GetLastError code" << GetLastError();
break;
}
DWORD dwSize = 0;
SetupDiGetDeviceInterfaceDetail( hDevInfo, &spdid, NULL,
0, &dwSize, NULL );
if (( dwSize != 0 ) && ( dwSize <= sizeof( Buf )))
{
pspdidd->cbSize = sizeof( *pspdidd ); // 5 Bytes!
ZeroMemory((PVOID)&spdd, sizeof(spdd));
spdd.cbSize = sizeof(spdd);
long res = SetupDiGetDeviceInterfaceDetail(
hDevInfo, &spdid, pspdidd,
dwSize, &dwSize, &spdd );
// if ( res )
// {
// HANDLE hDrive = CreateFile( pspdidd->DevicePath,0,
// FILE_SHARE_READ | FILE_SHARE_WRITE,
// NULL, OPEN_EXISTING, 0, NULL );
// if ( hDrive != INVALID_HANDLE_VALUE )
// {
// DWORD usbDeviceNumber = getDeviceNumber( hDrive );
// if ( usbDeviceNumber == volumeDeviceNumber )
// {
// fprintf( "%s", pspdidd->DevicePath );
// }
// }
// CloseHandle( hDrive );
// }
qDebug() << "Device Path" << pspdidd->DevicePath;
QString devicePath = QString::fromWCharArray( pspdidd->DevicePath );
return devicePath;
}
dwIndex++;
}
return "";
}
问题出在这部分代码：
if ( ! SetupDiEnumDeviceInterfaces( hDevInfo, NULL,
//&GUID_DEVINTERFACE_USB_DISK,
&my_guid,
dwIndex, &spdid ))
{
qDebug() << "GetLastError code" << GetLastError();
break;
}
返回错误代码 269，因此它不检索任何信息。我尝试提供几个不同的 GUID，我认为它们可以解决问题，但它没有，而且我不确定我应该提供什么 GUID，因为我的不是存储设备。
【问题讨论】：