我正尝试使用SetupDi函数枚举所有连接的USB设备的设备路径。设备路径是在CreateFile()中使用的路径,因此我可以与设备通信。
然而,SetupDiGetDeviceInterface需要一个接口GUID,但我不特别寻找特定的接口(除了所有连接的USB设备)。下面的源代码中这部分被注释为 /* ??? */。
尝试的解决方法:
我尝试提供GUID_DEVCLASS_UNKNOWN = {0x4d36e97e, 0xe325, 0x11ce, {0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}; 但这引发了“没有更多接口”错误。
我也尝试将deviceInfoData.ClassGuid提供给SetupDiGetDeviceInterface,但我得到了与上述相同的错误,“没有更多接口”。
问题:
是否有一般的接口类可以涵盖所有USB设备?(HID,通用等)
或者是否有另一种函数可以给我设备的路径?(而不是由SetupDiGetDeviceInterfaceDetail返回的SP_DEVICE_INTERFACE_DETAIL_DATA结构)。
源代码:
HDEVINFO deviceInfoList
SP_DEVINFO_DATA deviceInfoData;
deviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
SP_DEVICE_INTERFACE_DATA deviceInterfaceData;
PSP_DEVICE_INTERFACE_DETAIL_DATA deviceInterfaceDetailData = NULL;
DWORD requiredLength = 0;
char *hardwareID = 0;
// Retrieve a list of all present devices
deviceInfoList = SetupDiGetClassDevs(NULL, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE | DIGCF_ALLCLASSES);
if (deviceInfoList == INVALID_HANDLE_VALUE) {
SetupDiDestroyDeviceInfoList(deviceInfoList);
return false;
}
// Iterate over the list
for (DWORD i = 0; SetupDiEnumDeviceInfo(deviceInfoList, i, &deviceInfoData); i++) {
if (deviceInterfaceDetailData) LocalFree(deviceInterfaceDetailData);
requiredLength = 0;
SetupDiGetDeviceRegistryProperty(deviceInfoList, &deviceInfoData, SPDRP_HARDWAREID, &DataT, NULL, 0, &requiredLength);
if (requiredLength <= 0) {
SetupDiDestroyDeviceInfoList(deviceInfoList);
return false;
}
hardwareID = new char[requiredLength]();
SetupDiGetDeviceRegistryProperty(deviceInfoList, &deviceInfoData, SPDRP_HARDWAREID, &DataT, (PBYTE)hardwareID, requiredLength, NULL);
// Parse hardwareID for vendor ID and product ID
delete hardwareID;
hardwareID = 0;
deviceInterfaceData.cbSize = sizeof(SP_INTERFACE_DEVICE_DATA);
// Requires an interface GUID, for which I have none to specify
if (!SetupDiEnumDeviceInterfaces(deviceInfoList, &deviceInfoData, /* ??? */, 0, &deviceInterfaceData)) {
SetupDiDestroyDeviceInfoList(deviceInfoList);
return false;
}
if (!SetupDiGetDeviceInterfaceDetail(deviceInfoList, &deviceInterfaceData, NULL, 0, &requiredLength, NULL)) {
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER && requiredLength > 0) {
deviceInterfaceDetailData = (PSP_DEVICE_INTERFACE_DETAIL_DATA)LocalAlloc(LPTR, requiredLength);
if (!deviceInterfaceDetailData) {
SetupDiDestroyDeviceInfoList(deviceInfoList);
return false;
}
} else {
SetupDiDestroyDeviceInfoList(deviceInfoList);
return false;
}
}
deviceInterfaceDetailData->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
if (!SetupDiGetDeviceInterfaceDetail(deviceInfoList, &deviceInterfaceData, deviceInterfaceDetailData, requiredLength, NULL, &deviceInfoData)) {
SetupDiDestroyDeviceInfoList(deviceInfoList);
return false;
}
SetupDiDestroyDeviceInfoList(deviceInfoList);
// deviceInterfaceDetailData->DevicePath yields the device path
}