http://www.velleman.eu/images/tmp/usbfind.c#ifdef __cplusplus
extern "C" {
#endif
#include <windows.h>
#include <tchar.h>
#include <setupapi.h>
#include <initguid.h>
#include <stdio.h>
// This is the GUID for the USB device class
DEFINE_GUID(GUID_DEVINTERFACE_USB_DEVICE,
0xA5DCBF10L,
0x6530,
0x11D2,
0x90,
0x1F,
0x00,
0xC0,
0x4F,
0xB9,
0x51,
0xED);
// (A5DCBF10-6530-11D2-901F-00C04FB951ED)
int main()
{
HDEVINFO hDevInfo;
SP_DEVICE_INTERFACE_DATA DevIntfData;
PSP_DEVICE_INTERFACE_DETAIL_DATA DevIntfDetailData;
SP_DEVINFO_DATA DevData;
DWORD dwSize, dwType, dwMemberIdx;
HKEY hKey;
BYTE lpData[1024];
// We will try to get device information set for all USB devices that have a
// device interface and are currently present on the system (plugged in).
hDevInfo =
SetupDiGetClassDevs(
&GUID_DEVINTERFACE_USB_DEVICE, NULL,
0, DIGCF_DEVICEINTERFACE |
DIGCF_PRESENT);
if (hDevInfo !=
INVALID_HANDLE_VALUE)
{
// Prepare to enumerate all device interfaces for the device information
// set that we retrieved with SetupDiGetClassDevs(..)
DevIntfData.cbSize =
sizeof(SP_DEVICE_INTERFACE_DATA);
dwMemberIdx =
0;
// Next, we will keep calling this SetupDiEnumDeviceInterfaces(..) until this
// function causes GetLastError() to return ERROR_NO_MORE_ITEMS. With each
// call the dwMemberIdx value needs to be incremented to retrieve the next
// device interface information.
SetupDiEnumDeviceInterfaces(hDevInfo, NULL, &
GUID_DEVINTERFACE_USB_DEVICE,
dwMemberIdx, &
DevIntfData);
while(GetLastError() !=
ERROR_NO_MORE_ITEMS)
{
// As a last step we will need to get some more details for each
// of device interface information we are able to retrieve. This
// device interface detail gives us the information we need to identify
// the device (VID/PID), and decide if it's useful to us. It will also
// provide a DEVINFO_DATA structure which we can use to know the serial
// port name for a virtual com port.
DevData.cbSize =
sizeof(DevData);
// Get the required buffer size. Call SetupDiGetDeviceInterfaceDetail with
// a NULL DevIntfDetailData pointer, a DevIntfDetailDataSize
// of zero, and a valid RequiredSize variable. In response to such a call,
// this function returns the required buffer size at dwSize.
SetupDiGetDeviceInterfaceDetail(
hDevInfo, &DevIntfData, NULL,
0, &
dwSize, NULL);
// Allocate memory for the DeviceInterfaceDetail struct. Don't forget to
// deallocate it later!
DevIntfDetailData =
HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, dwSize);
DevIntfDetailData->cbSize =
sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
if (SetupDiGetDeviceInterfaceDetail(hDevInfo, &
DevIntfData,
DevIntfDetailData, dwSize, &dwSize, &
DevData))
{
// Finally we can start checking if we've found a useable device,
// by inspecting the DevIntfDetailData->DevicePath variable.
// The DevicePath looks something like this:
//
// \\?\usb#vid_04d8&pid_0033#5&19f2438f&0&2#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
//
// The VID for Velleman Projects is always 10cf. The PID is variable
// for each device:
//
// -------------------
// | Device | PID |
// -------------------
// | K8090 | 8090 |
// | VMB1USB | 0b1b |
// -------------------
//
// As you can see it contains the VID/PID for the device, so we can check
// for the right VID/PID with string handling routines.
if (NULL != _tcsstr((TCHAR*)DevIntfDetailData->DevicePath, _T(
"vid_10cf&pid_8090")))
{
// To find out the serial port for our K8090 device,
// we'll need to check the registry:
hKey =
SetupDiOpenDevRegKey(
hDevInfo,
&
DevData,
DICS_FLAG_GLOBAL,
0,
DIREG_DEV,
KEY_READ
);
dwType =
REG_SZ;
dwSize =
sizeof(lpData);
RegQueryValueEx(hKey, _T("PortName"), NULL, &dwType, lpData, &
dwSize);
RegCloseKey(hKey);
// Eureka!
wprintf(_T(
"Found a device on port '%s'\n"), lpData);
}
}
HeapFree(GetProcessHeap(), 0, DevIntfDetailData);
// Continue looping
SetupDiEnumDeviceInterfaces(
hDevInfo, NULL, &GUID_DEVINTERFACE_USB_DEVICE, ++dwMemberIdx, &
DevIntfData);
}
SetupDiDestroyDeviceInfoList(hDevInfo);
}
return 0;
}
转载于:https://www.cnblogs.com/shangdawei/p/4001069.html
相关资源：数据结构—成绩单生成器
