急求关于USB通讯的问题
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);
