小弟要抓取USB週邊裝置,結果只能抓到 usb->rs232裝置,其它的都抓不到?


[code cpp]
DEFINE_GUID(USB_DRIVER_GUID, 0x4D36E978,0xE325,0x11CE,0xBF,0xC1,0x08,0x00,0x2B,0xE1,0x03,0x18); // usb>rs232 的GUID, 使用此GUID 可抓到usb->rs232
//DEFINE_GUID(USB_DRIVER_GUID, 0x36FC9E60,0xC465,0x11CF,0x80,0x56,0x44,0x45,0x53,0x54,0x00,0x00); // 欲抓取的usb 週邊,使用此GUID 抓不到任何東西(在裝置管理員中可以看到)

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[/code]


[code cpp]

HANDLE OpenUsbDevice(const GUID *pGuid, char *sDevNameBuf)
{
HANDLE hOut = INVALID_HANDLE_VALUE;
HDEVINFO hDevInfo = SetupDiGetClassDevs(pGuid, NULL, NULL, DIGCF_PRESENT|DIGCF_INTERFACEDEVICE);
SP_INTERFACE_DEVICE_DATA deviceInfoData;
deviceInfoData.cbSize = sizeof (SP_INTERFACE_DEVICE_DATA);
ULONG nGuessCount = MAXLONG;
for(ULONG iDevIndex=0; iDevIndex {
if(SetupDiEnumDeviceInterfaces(hDevInfo, 0, pGuid, iDevIndex, &deviceInfoData)) // 使用usb->rs232 GUID 可以往下執行,如使用另一個 GUID 則執行else .
{
if((hOut=OpenOneDevice(hDevInfo, &deviceInfoData, sDevNameBuf)) != INVALID_HANDLE_VALUE)
break;
}
else if(GetLastError() == ERROR_NO_MORE_ITEMS) //No more items
{
break;
}
}
SetupDiDestroyDeviceInfoList(hDevInfo);
return hOut;
}
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[/code]


小弟剛接觸 USB ,煩請各位大大指教... 謝謝!!