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EDID版本解析。

【转】2017年上半年软件设计师上午真题及答案解析

HID 设备类读写 #include //! Defines the maximum length of a serial number #define SERNUM_LEN 40 //! Defines the maximum number of physical devices #define MAX_PHYS_DEVICES 6 //! \name HID Device return codes //! @{ // //! HID action/transfer was successful #define HID_DEVICE_SUCCESS 0x00 //! HID device was not found #define HID_DEVICE_NOT_FOUND 0x01 //! HID device is not opened #define HID_DEVICE_NOT_OPENED 0x02 //! HID device is allready opened #define HID_DEVICE_ALREADY_OPENED 0x03 //! Timeout occurs during transfer #define HID_DEVICE_TRANSFER_TIMEOUT 0x04 //! HID transfer failed #define HID_DEVICE_TRANSFER_FAILED 0x05 //! Invalid handle #define HID_DEVICE_HANDLE_ERROR 0x06 //! Unknown error #define HID_DEVICE_UNKNOWN_ERROR 0xFF //! @} // Enabled only when debugging HID connection issues //#define DEBUG_MODE //****************************************************************************** // //! \brief Device information structure. // //****************************************************************************** struct strHidDevice{ //! Handle for hid device HANDLE hndHidDevice; //! Indicator if device is opened BOOL bDeviceOpen; //! Timeout for GetReport requests UINT uGetReportTimeout; //! Timeout for SetReport requests UINT uSetReportTimeout; //! Asynchronous I/O structure OVERLAPPED oRead; //! Asynchronous I/O structure OVERLAPPED oWrite; //! Maximum length of InReport's WORD wInReportBufferLength; //! Maximum length of OutReport's WORD wOutReportBufferLength; //! InBuffer contains data, if InReport provides more data then the application actual need BYTE inBuffer[8192]; //! Number of current used bytes in inBuffer WORD inBufferUsed; }; //****************************************************************************** // //! A structure that tracks the number of serial numbers // //****************************************************************************** struct strTrackSerialNumbers { //! Index number DWORD deviceNum; //! Serial number of physical device char serialNum[SERNUM_LEN]; }; //****************************************************************************** // //! \addtogroup hiddevice_api //! @{ // //****************************************************************************** //****************************************************************************** // //! \brief Close a HID Device. //! //! This function will close a HID device based on the HID structure //! //! \param pstrHidDevice Structure which contains important data of an HID //! device //! //! \return Returns the error status, as one of //! \n \b HID_DEVICE_SUCCESS //! \n \b HID_DEVICE_NOT_OPENED //! \n \b HID_DEVICE_HANDLE_ERROR // //****************************************************************************** BYTE HID_Close(struct strHidDevice* pstrHidDevice); //****************************************************************************** // //! \brief Flush USB buffer for the given device //! //! \param pstrHidDevice Structure which contains important data of an HID //! device. //! //! \return Returns the error status, as one of //! \n \b HID_DEVICE_SUCCESS //! \n \b HID_DEVICE_HANDLE_ERROR //! \n \b HID_DEVICE_UNKNOWN_ERROR // //****************************************************************************** BYTE HID_FlushBuffer(struct strHidDevice* pstrHidDevice); //****************************************************************************** // //! \brief Gets the number of HID devices //! //! This function will return the number of interfaces connected with a //! specified VID, PID and serial number, if no devices are connected, //! it will return a 0 //! //! \param vid Vendor-Id of the device //! \param pid Product-Id of the device //! \param numSerNums Total number of connected physical devices //! //! \return Return the number of connected devices with the specific VID, PID, //! and serial number. // //****************************************************************************** DWORD HID_GetNumOfInterfaces(WORD vid, WORD pid, DWORD numSerNums); //****************************************************************************** // //! \brief Gets the number of serial number and serial number list //! //! Scans the HID Devices on the system for any whose VID/PID match the //! ones specified. For every one it finds, it returns that device's //! serial number in serialNumList. Every physical USB device within a //! given VID/PID space has a unique serial number; therefore, each //! item in the list corresponds with a separate physical USB device //! attached to this host; that is, different physical instances of the //! same product or design. The function returns the total number of //! serial numbers found; if none are found, it returns 0. //! //! \param vid Vendor-ID of the device //! \param pid Product-ID of the device //! \param serialNumList List of serial numbers corresponding to the passed //! VID and PID //! //! \return Returns the number of connected physical devices with the specific //! VID and PID // //****************************************************************************** DWORD HID_GetSerNums(WORD vid, WORD pid, struct strTrackSerialNumbers * serialNumList); //****************************************************************************** // //! \brief Returns the version number of a device. //! //! \param pstrHidDevice Structure which contains important data of an HID //! device. //! \param VersionNumber Pointer to USHORT variable. //! //! \return Returns the error status, as one of //! \n \b HID_DEVICE_SUCCESS //! \n \b HID_DEVICE_HANDLE_ERROR // //****************************************************************************** BYTE HID_GetVersionNumber(struct strHidDevice* pstrHidDevice, USHORT * VersionNumber); //****************************************************************************** // //! \brief Init structure with default values. //! //! It is important to call HID_Init() before calling HID_Open() to //! avoid unpredictable behavoir. //! //! \param pstrHidDevice Structure which contains important data of a HID //! device //! //! \return None // //****************************************************************************** void HID_Init(struct strHidDevice* pstrHidDevice); //****************************************************************************** // //! \brief This has to be called inside WM_ON_DEVICECHANGE notification window //! //! This function checks if the particular HID device structure is //! still connected or disconnected. //! //! \param pstrHidDevice Structure which contains important data of an HID //! device. //! //! \return Returns the error status, as one of //! \n \b HID_DEVICE_SUCCESS //! \n \b HID_DEVICE_HANDLE_ERROR // //****************************************************************************** BOOL HID_IsDeviceAffected(struct strHidDevice* pstrHidDevice); //****************************************************************************** // //! \brief Open a HID Device. //! //! This function opens the HID device associated with the HID interface //! 'deviceIndex' (0-7), on the physical device described by the VID, //! PID, and serial number. //! \param pstrHidDevice Structure which contains important data of an HID //! device //! \param vid Vendor-ID of the device //! \param pid Product-ID of the device //! \param deviceIndex Index of the device.If only one HID is connected, //! deviceIndex is 0. //! - Starts with zero //! - Maximum value is (HID_GetNumOfInterfaces() - 1) //! \param serialNumber Serial number of device to be opened. //! \param totalDevNum Total number of interfaces associated with the //! serial number //! \param totalSerNum Total number of physical devices associated with //! the VID/PID //! //! \return Returns the error status, as one of //! \n \b HID_DEVICE_SUCCESS //! \n \b HID_DEVICE_NOT_FOUND //! \n \b HID_DEVICE_ALREADY_OPENED // //****************************************************************************** BYTE HID_Open(struct strHidDevice* pstrHidDevice, WORD vid, WORD pid, DWORD deviceIndex, char serialNumber[SERNUM_LEN], DWORD totalDevNum, DWORD totalSerNum); //****************************************************************************** // //! \brief Reads a data stream from the given HID device. //! //! Prefixed report ID will be skipped. //! //! \param pstrHidDevice Structure which contains important data of an HID //! device //! \param buffer Pointer to buffer in which will be written //! \param bufferSize Number of bytes to read //! \param bytesReturned Number of actual read bytes //! //! \return Returns the error status, as one of //! \n \b HID_DEVICE_SUCCESS //! \n \b HID_DEVICE_NOT_OPENED //! \n \b HID_DEVICE_TRANSFER_TIMEOUT //! \n \b HID_DEVICE_TRANSFER_FAILED // //****************************************************************************** BYTE HID_ReadFile(struct strHidDevice* pstrHidDevice, BYTE* buffer, DWORD bufferSize, DWORD* bytesReturned); //****************************************************************************** // //! \brief Registers a device for program Windows notification. //! //! Registers the window pointed to by handle hWnd to receive //! notification when devices are added or removed from the system. //! //! \param hWnd Windows handle //! \param diNotifyHandle Device notification handle pointer address //! //! \return Returns the error status, as one of //! \n \b HID_DEVICE_SUCCESS //! \n \b HID_DEVICE_HANDLE_ERROR // //****************************************************************************** BYTE HID_RegisterForDeviceNotification(HWND hWnd, HDEVNOTIFY* diNotifyHandle); //****************************************************************************** // //! \brief Un-Registers a device from Windows notification. //! //! Un-registers the window pointed to by handle hWnd to receive //! notification when devices are added or removed from the system. //! //! \param diNotifyHandle: Device notification handle pointer address. //! //! \return Returns the error status, as one of //! \n \b HID_DEVICE_SUCCESS //! \n \b HID_DEVICE_HANDLE_ERROR // //****************************************************************************** BYTE HID_UnRegisterForDeviceNotification(HDEVNOTIFY* diNotifyHandle); //****************************************************************************** // //! \brief Writes a data stream to the given HID device. //! //! Needed report IDs will be generated automatically. //! //! \param pstrHidDevice Structure which contains important data of an HID //! device //! \param buffer Buffer which will be send //! \param bufferSize Number of bytes to send //! //! \return Returns the error status, as one of //! \n \b HID_DEVICE_SUCCESS //! \n \b HID_DEVICE_NOT_OPENED //! \n \b HID_DEVICE_TRANSFER_TIMEOUT //! \n \b HID_DEVICE_TRANSFER_FAILED // //****************************************************************************** BYTE HID_WriteFile(struct strHidDevice* pstrHidDevice, BYTE* buffer, DWORD bufferSize);

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