最近项目上需要做一个小上位机,获取相同HID设备的信息,并逐个进行系统设置。
经过1天的调试,已经完成了。前期在相同HID设备句柄获取方面,受到了一点小小的阻力,网上也没有获取到相关的信息,可能有遇到同样问题的朋友,把我的解决方式贴出来,或许会有点作用吧。
基于VS2015,使用MFC自带USB类库。核心代码如下,思路其实很简单:通常我们使用PID和VID来获得不同设备的句柄,相同PID和VID的设备,就需要其他的特征来获取句柄,调试过程中发现,相同HID的设备,设备路径是不同的,可以用设备路径作为区分,来获得句柄即可。
HANDLE OpenSamePIDDevice(int overlapped, unsigned short Pid_Value)
{
int Pid_count = 0;
LPCWSTR device_path = NULL;
HANDLE hidHandle = NULL;
HidD_GetHidGuid(&hidGuid); //取得类别
HDEVINFO hDevInfo = SetupDiGetClassDevs(&hidGuid, NULL, NULL,
(DIGCF_PRESENT | DIGCF_DEVICEINTERFACE)); //获取设备信息群
if (hDevInfo == INVALID_HANDLE_VALUE)//未获得设备信息群则直接退出
return INVALID_HANDLE_VALUE;
SP_DEVICE_INTERFACE_DATA devInfoData;
devInfoData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
int deviceNo = 0;
SetLastError(NO_ERROR);
while (GetLastError() != ERROR_NO_MORE_ITEMS)
{
if (SetupDiEnumInterfaceDevice(hDevInfo, 0, &hidGuid, deviceNo, &devInfoData)) //枚举成功?
{
ULONG requiredLength = 0;
SetupDiGetInterfaceDeviceDetail(hDevInfo, &devInfoData, NULL, 0, &requiredLength, NULL);//获得接口详细信息
PSP_INTERFACE_DEVICE_DETAIL_DATA devDetail = (SP_INTERFACE_DEVICE_DETAIL_DATA*)malloc(requiredLength);
devDetail->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
if (!SetupDiGetInterfaceDeviceDetail(hDevInfo, &devInfoData, devDetail, requiredLength, NULL, NULL))//获得详细信息失败则退出
{
free(devDetail);
SetupDiDestroyDeviceInfoList(hDevInfo);
return INVALID_HANDLE_VALUE;
}
if (overlapped) //打开设备
{
hidHandle = CreateFile(devDetail->DevicePath,
GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
}
else
{
hidHandle = CreateFile(devDetail->DevicePath,
GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);
}
//if (devDetail != NULL)
//free(devDetail);
if (hidHandle == INVALID_HANDLE_VALUE)
{
SetupDiDestroyDeviceInfoList(hDevInfo);
// free(devDetail);
return INVALID_HANDLE_VALUE;
}
_HIDD_ATTRIBUTES hidAttributes;
if (!HidD_GetAttributes(hidHandle, &hidAttributes))
{
CloseHandle(hidHandle);
SetupDiDestroyDeviceInfoList(hDevInfo);
return INVALID_HANDLE_VALUE;
}
if ((USB_VID == hidAttributes.VendorID)&(Pid_Value == hidAttributes.ProductID)) //仅仅根据VID进行STM32设备判断
{
++Pid_count;
if (Pid_count == 1)
{
//获得句柄
if(Pid_Value == Falcon_Handset_PID)
{
hHandSet1 = hidHandle;
}
else if(Pid_Value == Falcon_Camera_PID)
{
hCamera1 = hidHandle;
}
device_path = devDetail->DevicePath;//用于路径比较
}
if ((Pid_count != 1)&(device_path!= devDetail->DevicePath))
{
if (Pid_Value == Falcon_Handset_PID)
{
hHandSet2 = hidHandle;
}
else if (Pid_Value == Falcon_Camera_PID)
{
hCamera2 = hidHandle;
}
break;
}
//CloseHandle(hidHandle);
++deviceNo;
}
else
{
CloseHandle(hidHandle);
++deviceNo;
}
}
}
SetupDiDestroyDeviceInfoList(hDevInfo);
return hidHandle;
}