0
检索“设备实例路径”我跟了一些资源，包括this一个在那里我可以取回一串如PID，VID USB设备等方面的性能，但我需要检索“设备实例路径”，并且也因为它包含最终我想要的序列号（最后4位）从连接的USB设备
我试图使用here代码检索序列号，但它对USB存储设备是这样做的，我的是一个独立的设备，它有USB连接类似像机
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 "";
}
问题是这个pa rt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。我想提供几个我本以为这解决这个问题有不同的GUID，但它没有，我不知道我GUID应该提供反正因为我的不是存储设备。