CyUSB.sys的说明文档CyUSB.chm-IOCTL接口范例-IOCTL_ADAPT_SEND_EP0_CONTROL_TRANSFER

DeviceIoControl()可以利用Io Control (aka IOCTL) code操作USB设备驱动，这些IOCTL码由谁定义由谁解释呢？（CyAPI.lib? CyUSB.dll? CyUSB.sys?）

答案：cyioctl.h
例如：
#define IOCTL_ADAPT_GET_DRIVER_VERSION         CTL_CODE(FILE_DEVICE_UNKNOWN, IOCTL_ADAPT_INDEX, METHOD_BUFFERED, FILE_ANY_ACCESS)

..

#define IOCTL_ADAPT_GET_ALT_INTERFACE_SETTING CTL_CODE(FILE_DEVICE_UNKNOWN, IOCTL_ADAPT_INDEX+2, METHOD_BUFFERED, FILE_ANY_ACCESS)

至于“FILE_DEVICE_UNKNOWN, IOCTL_ADAPT_INDEX, METHOD_BUFFERED, FILE_ANY_ACCESS”这些东西的定义，应该是在Windows相关头文件or库里面吧。

 

这是IOCTL Interface的IOCTL_ADAPT_SEND_EP0_CONTROL_TRANSFER的使用范例：

Description

This command sends a control request to the default Control endpoint, endpoint zero.

DeviceIoControl( ) is passed a pointer to a two-part structure as both the lpInBuffer and lpOutBuffer parameters. This two-part structure contains a SINGLE_TRANSFER structure followed by a data buffer.

The SINGLE_TRANSFER structure contains all the parameters for the control request.

The buffer contains the transfer data.

pXmitBuf
　　SINGLE_TRANFER
　　　　bmRequest
　　　　Request
　　　　.
　　　　.
　　buff

　

union  {



struct   {



UCHAR Recipient:5; //接收方: Device,Interface,Endpoint,Other

UCHAR  Type:2;  //Type: Standard,Class,Vendor

UCHAR Direction:1; //数据传输方向: Host2Device,Device2Host

} bmRequest;

 UCHAR bmReq;   //请求类型

};



bmRequest.Recipient = 0; //  Device

bmRequest.Type      = 2; //  Vendor

bmRequest.Direction = 1; // IN command (from  Device to Host)



 

int iXmitBufSize = sizeof(SINGLE_TRANSFER) + bufLen; //  The size of the two-part structure. XmitBuf is the two-part structure.



UCHAR *pXmitBuf = new UCHAR[iXmitBufSize];           //  Allocate the memory 创建iXmitBufSize大小的UCHAR变量



ZeroMemory(pXmitBuf, iXmitBufSize);     // 指定存储空(UCHAR)间清零



PSINGLE_TRANSFER pTransfer = (PSINGLE_TRANSFER)pXmitBuf; //  The SINGLE_TRANSFER comes first 下面首先定义SINGLE_TRANSFER Structure的值



pTransfer->SetupPacket.bmRequest = bmReq;　　　　//Birmap Characteristics of request

pTransfer->SetupPacket.bRequest = ReqCode;　　　　//Specific request

pTransfer->SetupPacket.wValue = Value;　　　　　　　

pTransfer->SetupPacket.wIndex = Index;

pTransfer->SetupPacket.wLength = bufLen;　　　　　　//Number of bytes to transfer if there is a Data stage

pTransfer->SetupPacket.ulTimeOut = TimeOut / 1000;

pTransfer->Reserved = 0;

pTransfer->ucEndpointAddress = 0x00;     //  Control pipe

pTransfer->IsoPacketLength = 0;

pTransfer->BufferOffset = sizeof (SINGLE_TRANSFER);

pTransfer->BufferLength = bufLen;

DWORD dwReturnBytes;

 

DeviceIoControl (hDevice, IOCTL_ADAPT_SEND_EP0_CONTROL_TRANSFER,

             pXmitBuf,  iXmitBufSize,

             pXmitBuf,  iXmitBufSize,

             &dwReturnBytes,  NULL);

 

// Copy data into  buf

UCHAR *ptr = pXmitBuf + sizeof (SINGLE_TRANSFER);

memcpy(buf, ptr, dwReturnBytes);