急求关于USB通讯的问题

wdjust 2013-02-20 03:55:03

大家好：
正在写一个USB通讯的程序：



#include "setupapi.h"

#define USBIO_IID {0x325ddf96, 0x938c, 0x11d3, {0x9e, 0x34, 0x00, 0x80, 0xc8, 0x27, 0x27, 0xf4}}

#define DEVICE_NUMBER 0

HDEVINFO DevInfo;



	  GUID g_UsbioID=USBIO_IID;

	  SP_DEVICE_INTERFACE_DATA DevData;

	  SP_INTERFACE_DEVICE_DETAIL_DATA *DevDetail = NULL;

	  DWORD ReqLen;

	  DevInfo=SetupDiGetClassDevs(&g_UsbioID,NULL,NULL,DIGCF_DEVICEINTERFACE|DIGCF_PRESENT);

	  SetupDiEnumDeviceInterfaces(DevInfo, NULL,&g_UsbioID, DEVICE_NUMBER, &DevData );  //返回值为0

	  DWORD code =GetLastError();       //错误代码1784

	  SetupDiGetDeviceInterfaceDetail(DevInfo, &DevData, NULL,0, &ReqLen, NULL);

	  DWORD ni =GetLastError();

	  DevDetail = (SP_INTERFACE_DEVICE_DETAIL_DATA*) malloc(ReqLen);

	  // now get the detailed device information

	  DevDetail->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);

	  SetupDiGetDeviceInterfaceDetail(DevInfo, &DevData, DevDetail,ReqLen, &ReqLen, NULL);

	  // open the device, use OVERLAPPED flag if necessary

	  // use DevDetail->DevicePath as device name

	  hdle = CreateFile(DevDetail->DevicePath,GENERIC_READ|GENERIC_WRITE,FILE_SHARE_WRITE|FILE_SHARE_READ,NULL,OPEN_EXISTING,0,NULL);