www.pudn.com > USB_Complete_Source_Code.zip > usbhidiocDlg.cpp
// usbhidiocDlg.cpp : implementation file /* Project: usbhidioc.cpp Version: 1.2 Date: 8/17/00 by Jan Axelson (jan@lvr.com) Purpose: demonstrates USB communications with a HID-class device Description: Finds an attached HID-class device that matches specific vendor & product IDs. Retrieves the device's capabilities. Sends two bytes to the device using Input reports. Receives two bytes from the device using Output reports. A list box displays a log of activity. A Bytes Received list box displays the most recent received report bytes. Combo boxes enable the user to select what bytes to send. An autoincrement check box causes the application to increment the bytes sent with each report. Clicking the Once button causes the application to exchange one set of reports. Clicking the Continuous button causes the application to exchange reports periodically (every 5 seconds). This application was created with Visual C++ 6's AppWizard as a dialog-based application. Companion firmware and other sample code is available from www.lvr.com. I owe a big thank you to the many generous contributors on Usenet and the excellent archive at www.deja.com/usenet for helping me with Visual C++ in this project. Other sources I used were www.natsemi.com's example HID application and John Hyde's terminal program at www.usb-by-example.com. Send comments, questions, bug reports, etc. to jan@lvr.com. Fixes: 1. In the call to SetupDiEnumDeviceInterfaces, the fourth parameter is now MemberIndex instead of 0. (Thanks to Bob Nathan). 2. free(detailData) was in the wrong place. It's now at the very end of the if (Result !=0) statement. (Thanks to Adam Gresswell.) 3. Added the ApplicationActive flag and code to terminate the ReadReport thread in CUsbhidiocDlg::OnClose. (Thanks to Sang-Gon Park.) */ #include "stdafx.h" #include "usbhidioc.h" #include "usbhidiocDlg.h" #include#include #define MAX_LOADSTRING 256 extern "C" { #include "hidsdi.h" #include } #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif //function prototypes bool FindTheHID(); DWORD WINAPI ReadReport(); void DisplayCurrentTime(); void DisplayData(CString cstrDataToDisplay); void DisplayInputReport(); void DisplayLastError(CString Operation); void DisplayReceivedData(char ReceivedByte); void GetDeviceCapabilities(); void ReadAndWriteToDevice(); void ScrollToBottomOfListBox(USHORT Index); void WriteReport(); static DWORD StaticIO_Thread(LPVOID); ///////////////////////////////////////////////////////////////////////////// // CAboutDlg dialog used for App About class CAboutDlg : public CDialog { public: CAboutDlg(); // Dialog Data //{{AFX_DATA(CAboutDlg) enum { IDD = IDD_ABOUTBOX }; //}}AFX_DATA // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CAboutDlg) protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support //}}AFX_VIRTUAL // Implementation protected: //{{AFX_MSG(CAboutDlg) //}}AFX_MSG DECLARE_MESSAGE_MAP() }; CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) { //{{AFX_DATA_INIT(CAboutDlg) //}}AFX_DATA_INIT } void CAboutDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CAboutDlg) //}}AFX_DATA_MAP } BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) //{{AFX_MSG_MAP(CAboutDlg) // No message handlers //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CUsbhidiocDlg dialog CUsbhidiocDlg::CUsbhidiocDlg(CWnd* pParent /*=NULL*/) : CDialog(CUsbhidiocDlg::IDD, pParent) { //{{AFX_DATA_INIT(CUsbhidiocDlg) m_AutoIncrement = FALSE; m_ResultsString = _T(""); m_strBytesReceived = _T(""); m_strByteToSend0 = _T(""); m_strByteToSend1 = _T(""); //}}AFX_DATA_INIT // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); } //Application global variables DWORD ActualBytesRead; bool ApplicationActive; DWORD BytesRead; HIDP_CAPS Capabilities; bool DeviceDetected; HANDLE DeviceHandle; HANDLE hDevInfo; GUID HidGuid; char InputReport[3]; ULONG Length; HANDLE ReadHandle; ULONG Required; HANDLE ThreadHandle; DWORD ThreadID; HANDLE WriteHandle; void CUsbhidiocDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CUsbhidiocDlg) DDX_Control(pDX, IDC_Continuous, m_Continuous); DDX_Control(pDX, IDC_AutoIncrement, m_cbutAutoIncrement); DDX_Control(pDX, IDC_cboByteToSend1, m_cboByteToSend1); DDX_Control(pDX, IDC_cboByteToSend0, m_cboByteToSend0); DDX_Control(pDX, IDC_lstBytesReceived, m_BytesReceived); DDX_Control(pDX, IDC_LIST2, m_ResultsList); DDX_Control(pDX, IDC_Once, m_Once); DDX_Check(pDX, IDC_AutoIncrement, m_AutoIncrement); DDX_LBString(pDX, IDC_LIST2, m_ResultsString); DDX_LBString(pDX, IDC_lstBytesReceived, m_strBytesReceived); DDX_CBString(pDX, IDC_cboByteToSend0, m_strByteToSend0); DDX_CBString(pDX, IDC_cboByteToSend1, m_strByteToSend1); //}}AFX_DATA_MAP } BEGIN_MESSAGE_MAP(CUsbhidiocDlg, CDialog) //{{AFX_MSG_MAP(CUsbhidiocDlg) ON_WM_SYSCOMMAND() ON_WM_PAINT() ON_WM_QUERYDRAGICON() ON_BN_CLICKED(IDC_Once, OnOnce) ON_EN_CHANGE(IDC_Results, OnChangeResults) ON_BN_CLICKED(IDC_Continuous, OnContinuous) ON_WM_TIMER() ON_WM_CLOSE() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CUsbhidiocDlg message handlers BOOL CUsbhidiocDlg::OnInitDialog() { CDialog::OnInitDialog(); //My declares begin here int ByteToSend =0; CString strByteToSend = ""; CString strComboBoxText=""; //End my declares // Add "About..." menu item to system menu. // IDM_ABOUTBOX must be in the system command range. ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ASSERT(IDM_ABOUTBOX < 0xF000); CMenu* pSysMenu = GetSystemMenu(FALSE); if (pSysMenu != NULL) { CString strAboutMenu; strAboutMenu.LoadString(IDS_ABOUTBOX); if (!strAboutMenu.IsEmpty()) { pSysMenu->AppendMenu(MF_SEPARATOR); pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); } } // Set the icon for this dialog. The framework does this automatically // when the application's main window is not a dialog SetIcon(m_hIcon, TRUE); // Set big icon SetIcon(m_hIcon, FALSE); // Set small icon /* My code begins here. Anything that needs to happen when the application starts goes in this routine. */ //Populate the combo boxes with values from 00 to FF. DeviceDetected=FALSE; ApplicationActive=TRUE; for (ByteToSend=0; ByteToSend < 256; ByteToSend++) { //Display the value as a 2-digit Hex value. strByteToSend.Format("%.2X",ByteToSend); //Add the value to the combo boxes. m_cboByteToSend0.AddString(strByteToSend); m_cboByteToSend1.AddString(strByteToSend); } //Select default values for the combo boxes. m_cboByteToSend0.SetCurSel(0); m_cboByteToSend1.SetCurSel(128); //Check the autoincrement check box. m_cbutAutoIncrement.SetCheck(1); //Set the caption for the Continous button. m_Continuous.SetWindowText("Continuous"); //end my code return TRUE; // return TRUE unless you set the focus to a control } void CUsbhidiocDlg::OnSysCommand(UINT nID, LPARAM lParam) { if ((nID & 0xFFF0) == IDM_ABOUTBOX) { CAboutDlg dlgAbout; dlgAbout.DoModal(); } else { CDialog::OnSysCommand(nID, lParam); } } // If you add a minimize button to your dialog, you will need the code below // to draw the icon. For MFC applications using the document/view model, // this is automatically done for you by the framework. void CUsbhidiocDlg::OnPaint() { if (IsIconic()) { CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); // Center icon in client rectangle int cxIcon = GetSystemMetrics(SM_CXICON); int cyIcon = GetSystemMetrics(SM_CYICON); CRect rect; GetClientRect(&rect); int x = (rect.Width() - cxIcon + 1) / 2; int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon dc.DrawIcon(x, y, m_hIcon); } else { CDialog::OnPaint(); } } // The system calls this to obtain the cursor to display while the user drags // the minimized window. HCURSOR CUsbhidiocDlg::OnQueryDragIcon() { return (HCURSOR) m_hIcon; } /* My routines (routines specific to this application) start here. */ void CUsbhidiocDlg::OnOnce() { //Click the Once button to read and write one pair of reports. ReadAndWriteToDevice(); } void CUsbhidiocDlg::OnContinuous() { //Click the Continuous button to //begin or stop requesting and sending periodic reports. CString Caption; //Find out whether Continuous is currently selected //and take appropriate action. m_Continuous.GetWindowText(Caption); if (Caption == "Continuous") { //Enable periodic exchanges of reports. //Change the button caption. m_Continuous.SetWindowText("Stop Continuous"); //Start by reading and writing one pair of reports. ReadAndWriteToDevice(); //Enable the timer to cause periodic exchange of reports. SetTimer(ID_CLOCK_TIMER, 5000, NULL); } else { //Stop periodic exchanges of reports. //Change the button caption. m_Continuous.SetWindowText("Continuous"); //Disable the timer. KillTimer(ID_CLOCK_TIMER); } } void CUsbhidiocDlg::OnClose() { //Anything that needs to occur on closing the application goes here. //Free any resources used by previous API calls and still allocated. //Setting ApplicationActive FALSE signals the ReadReport thread to close. ApplicationActive=FALSE; //Wait for the ReadReport thread to close. WaitForSingleObject(ThreadHandle, INFINITE); //Close open handles. CloseHandle(DeviceHandle); DisplayLastError("CloseHandle(DeviceHandle)"); CloseHandle(ReadHandle); DisplayLastError("CloseHandle(ReadHandle)"); CloseHandle(ThreadHandle); DisplayLastError("CloseHandle(ThreadHandle)"); CDialog::OnClose(); } bool CUsbhidiocDlg::FindTheHID() { //Use a series of API calls to find a HID with a matching Vendor and Product ID. HIDD_ATTRIBUTES Attributes; PSP_DEVICE_INTERFACE_DETAIL_DATA detailData; SP_DEVICE_INTERFACE_DATA devInfoData; bool LastDevice = FALSE; int MemberIndex = 0; bool MyDeviceDetected = FALSE; LONG Result; //These are the vendor and product IDs to look for. //Uses Lakeview Research's Vendor ID. const unsigned int VendorID = 0x0925; const unsigned int ProductID = 0x1234; Length = 0; detailData = NULL; DeviceHandle=NULL; /* API function: HidD_GetHidGuid Get the GUID for all system HIDs. Returns: the GUID in HidGuid. */ HidD_GetHidGuid(&HidGuid); /* API function: SetupDiGetClassDevs Returns: a handle to a device information set for all installed devices. Requires: the GUID returned by GetHidGuid. */ hDevInfo=SetupDiGetClassDevs \ (&HidGuid, \ NULL, \ NULL, \ DIGCF_PRESENT|DIGCF_INTERFACEDEVICE); devInfoData.cbSize = sizeof(devInfoData); //Step through the available devices looking for the one we want. //Quit on detecting the desired device or checking all available devices without success. MemberIndex = 0; LastDevice = FALSE; do { MyDeviceDetected=FALSE; /* API function: SetupDiEnumDeviceInterfaces On return, MyDeviceInterfaceData contains the handle to a SP_DEVICE_INTERFACE_DATA structure for a detected device. Requires: The DeviceInfoSet returned in SetupDiGetClassDevs. The HidGuid returned in GetHidGuid. An index to specify a device. */ Result=SetupDiEnumDeviceInterfaces \ (hDevInfo, \ 0, \ &HidGuid, \ MemberIndex, \ &devInfoData); if (Result != 0) { //A device has been detected, so get more information about it. /* API function: SetupDiGetDeviceInterfaceDetail Returns: an SP_DEVICE_INTERFACE_DETAIL_DATA structure containing information about a device. To retrieve the information, call this function twice. The first time returns the size of the structure in Length. The second time returns a pointer to the data in DeviceInfoSet. Requires: A DeviceInfoSet returned by SetupDiGetClassDevs The SP_DEVICE_INTERFACE_DATA structure returned by SetupDiEnumDeviceInterfaces. The final parameter is an optional pointer to an SP_DEV_INFO_DATA structure. This application doesn't retrieve or use the structure. If retrieving the structure, set MyDeviceInfoData.cbSize = length of MyDeviceInfoData. and pass the structure's address. */ //Get the Length value. //The call will return with a "buffer too small" error which can be ignored. Result = SetupDiGetDeviceInterfaceDetail \ (hDevInfo, \ &devInfoData, \ NULL, \ 0, \ &Length, \ NULL); //Allocate memory for the hDevInfo structure, using the returned Length. detailData = (PSP_DEVICE_INTERFACE_DETAIL_DATA)malloc(Length); //Set cbSize in the detailData structure. detailData -> cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA); //Call the function again, this time passing it the returned buffer size. Result = SetupDiGetDeviceInterfaceDetail \ (hDevInfo, \ &devInfoData, \ detailData, \ Length, \ &Required, \ NULL); //Open a handle to the device. /* API function: CreateFile Returns: a handle that enables reading and writing to the device. Requires: The DevicePath in the detailData structure returned by SetupDiGetDeviceInterfaceDetail. */ DeviceHandle=CreateFile \ (detailData->DevicePath, \ GENERIC_READ|GENERIC_WRITE, \ FILE_SHARE_READ|FILE_SHARE_WRITE, \ NULL, \ OPEN_EXISTING, \ 0, \ NULL); DisplayLastError("CreateFile: "); /* API function: HidD_GetAttributes Requests information from the device. Requires: the handle returned by CreateFile. Returns: a HIDD_ATTRIBUTES structure containing the Vendor ID, Product ID, and Product Version Number. Use this information to decide if the detected device is the one we're looking for. */ //Set the Size to the number of bytes in the structure. Attributes.Size = sizeof(Attributes); Result = HidD_GetAttributes \ (DeviceHandle, \ &Attributes); DisplayLastError("HidD_GetAttributes: "); //Is it the desired device? MyDeviceDetected = FALSE; if (Attributes.VendorID == VendorID) { if (Attributes.ProductID == ProductID) { //Both the Product and Vendor IDs match. MyDeviceDetected = TRUE; DisplayData("Device detected"); //Get the device's capablities. GetDeviceCapabilities(); //Use this handle for writing reports. WriteHandle=DeviceHandle; //ReadFile is a blocking call, //so get another handle for another thread for reading reports. ReadHandle=CreateFile \ (detailData->DevicePath, \ GENERIC_READ|GENERIC_WRITE, \ FILE_SHARE_READ|FILE_SHARE_WRITE, \ NULL, \ OPEN_EXISTING, \ 0, \ NULL); DisplayLastError("CreateFile for Read Handle: "); /* Create a thread for reading reports from the device. ReadFile is a blocking call, so it's called in a separate program thread. This keeps the main program thread from hanging while waiting for a report from the device. In CreateThread, StaticIO_Thread is a static member that accepts the "this" pointer and casts it to a pointer to the ReadReport routine, which does the ReadFile. */ ThreadHandle = CreateThread \ (NULL, \ 0, \ (LPTHREAD_START_ROUTINE)StaticIO_Thread, \ this, \ 0, \ &ThreadID); if (ThreadHandle == NULL) CloseHandle(ThreadHandle); DisplayLastError("CreateThread: "); } //if (Attributes.ProductID == ProductID) else //The Product ID doesn't match. CloseHandle(DeviceHandle); } //if (Attributes.VendorID == VendorID) else //The Vendor ID doesn't match. CloseHandle(DeviceHandle); //Free the memory used by the detailData structure (no longer needed). free(detailData); } //if (Result != 0) else //SetupDiEnumDeviceInterfaces returned 0, so there are no more devices to check. LastDevice=TRUE; //If we haven't found the device yet, and haven't tried every available device, //try the next one. MemberIndex = MemberIndex + 1; } //do while ((LastDevice == FALSE) && (MyDeviceDetected == FALSE)); if (MyDeviceDetected == FALSE) DisplayData("Device not detected"); SetupDiDestroyDeviceInfoList(hDevInfo); DisplayLastError("SetupDiDestroyDeviceInfoList"); return MyDeviceDetected; } void CUsbhidiocDlg::GetDeviceCapabilities() { //Get the Capabilities structure for the device. PHIDP_PREPARSED_DATA PreparsedData; /* API function: HidD_GetPreparsedData Returns: a pointer to a buffer containing the information about the device's capabilities. Requires: A handle returned by CreateFile. There's no need to access the buffer directly, but HidP_GetCaps and other API functions require a pointer to the buffer. */ HidD_GetPreparsedData \ (DeviceHandle, \ &PreparsedData); DisplayLastError("HidD_GetPreparsedData: "); /* API function: HidP_GetCaps Learn the device's capabilities. For standard devices such as joysticks, you can find out the specific capabilities of the device. For a custom device, the software will probably know what the device is capable of, and the call only verifies the information. Requires: the pointer to the buffer returned by HidD_GetPreparsedData. Returns: a Capabilities structure containing the information. */ HidP_GetCaps \ (PreparsedData, \ &Capabilities); DisplayLastError("HidP_GetCaps: "); //Display the capabilities CString ValueToDisplay; ValueToDisplay.Format("%s%X", "Usage Page: ", Capabilities.UsagePage); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Input Report Byte Length: ", Capabilities.InputReportByteLength); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Output Report Byte Length: ", Capabilities.OutputReportByteLength); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Feature Report Byte Length: ", Capabilities.FeatureReportByteLength); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Number of Link Collection Nodes: ", Capabilities.NumberLinkCollectionNodes); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Number of Input Button Caps: ", Capabilities.NumberInputButtonCaps); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Number of InputValue Caps: ", Capabilities.NumberInputValueCaps); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Number of InputData Indices: ", Capabilities.NumberInputDataIndices); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Number of Output Button Caps: ", Capabilities.NumberOutputButtonCaps); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Number of Output Value Caps: ", Capabilities.NumberOutputValueCaps); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Number of Output Data Indices: ", Capabilities.NumberOutputDataIndices); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Number of Feature Button Caps: ", Capabilities.NumberFeatureButtonCaps); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Number of Feature Value Caps: ", Capabilities.NumberFeatureValueCaps); DisplayData(ValueToDisplay); ValueToDisplay.Format("%s%d", "Number of Feature Data Indices: ", Capabilities.NumberFeatureDataIndices); DisplayData(ValueToDisplay); //No need for PreparsedData any more, so free the memory it's using. HidD_FreePreparsedData(PreparsedData); DisplayLastError("HidD_FreePreparsedData: ") ; } void CUsbhidiocDlg::ReadAndWriteToDevice() { //If we haven't done so already, find the device and learn its capabilities. //Then send a report and request a report. //The test device firmware (usbhidio) adds 1 to each byte received in an OUT report //and sends the results back in the next IN report. //Clear the List Box (optional). //m_ResultsList.ResetContent(); //Don't attempt anything if a previous transfer hasn't completed. { DisplayData("***HID Test Report***"); DisplayCurrentTime(); //If the device hasn't been detected already, look for it. if (DeviceDetected==FALSE) DeviceDetected=FindTheHID(); if (DeviceDetected==TRUE) { //Write a report to the device. WriteReport(); //Get the latest report read from the device and display it. DisplayInputReport(); } // (EndIf: if DeviceDetected == True) } } DWORD CUsbhidiocDlg::StaticIO_Thread(LPVOID Param) { //Used in creating a thread for ReadFiles. //Accepts the "this" pointer and casts it to a pointer to ReadReport. if (Param != NULL) return ((CUsbhidiocDlg*)Param)->ReadReport(); else return -1; } DWORD WINAPI CUsbhidiocDlg::ReadReport() { CString ByteToDisplay = ""; ULONG InputReportLength = 0; CString MessageToDisplay = ""; ULONG Result; //Read a report from the device. InputReportLength=Capabilities.InputReportByteLength; do { /* ReadFile Returns: A report in InputReport. The number of bytes actually read in BytesRead. Requires: A device handle returned by CreateFile. The report length returned by HidP_GetCaps in Capabilities.InputReportByteLength. */ Result = ReadFile \ (ReadHandle, \ InputReport, \ Capabilities.InputReportByteLength, \ &BytesRead, \ NULL); ActualBytesRead = BytesRead; if (Result == 0) { //The ReadFile failed, so close the handle, display a message, //and set DeviceDetected to FALSE so the next attempt will look for the device. CloseHandle(ReadHandle); DisplayData("Can't read from device"); DeviceDetected = FALSE; } } //Exit the loop if the device is no longer detected or the user has clicked the close button. while ((DeviceDetected == TRUE) && (ApplicationActive == TRUE)); return 0; } void CUsbhidiocDlg::WriteReport() { //Send a report to the device. DWORD BytesWritten = 0; INT Index =0; CHAR OutputReport[3]; ULONG Result; CString strBytesWritten = ""; //The first byte is the report number. OutputReport[0]=0; //Can set the other report values here, or get them from the combo boxes. //OutputReport[1]=33; //OutputReport[2]=6; //OutputReport[3]=15; //Get the bytes to send from the combo boxes. //If Autoincrement is checked, increment the selection. if (m_cbutAutoIncrement.GetCheck()>0) { Index=m_cboByteToSend0.GetCurSel(); Index=Index+1; m_cboByteToSend0.SetCurSel(Index); } if (m_cbutAutoIncrement.GetCheck()>0) { Index=m_cboByteToSend1.GetCurSel(); Index=Index+1; m_cboByteToSend1.SetCurSel(Index); } //Get the values from the combo boxes. OutputReport[1]=m_cboByteToSend0.GetCurSel(); OutputReport[2]=m_cboByteToSend1.GetCurSel(); /* WriteFile Sends a report to the device. Returns: success or failure. Requires: The device handle returned by CreateFile. The Output Report length returned by HidP_GetCaps, A report to send. */ Result = WriteFile \ (DeviceHandle, \ OutputReport, \ Capabilities.OutputReportByteLength, \ &BytesWritten, \ NULL); if (Result == 0) { //The WriteFile failed, so close the handle, display a message, //and set DeviceDetected to FALSE so the next attempt will look for the device. CloseHandle(DeviceHandle); DisplayData("Can't write to device"); DeviceDetected = FALSE; } //Display the result of the API call and the report bytes. DisplayLastError("WriteFile: "); strBytesWritten.Format("%s%d", "Bytes Written: ", BytesWritten); DisplayData(strBytesWritten); } /* Display-related routines */ void CUsbhidiocDlg::DisplayInputReport() { USHORT ByteNumber; CString MessageToDisplay = ""; CHAR ReceivedByte; //Display the number of bytes read. MessageToDisplay.Format("%s%d", "Number of Bytes Read: ", ActualBytesRead); DisplayData(MessageToDisplay); //Display the received data in the log and the Bytes Received List boxes. //Start at the top of the List Box. m_BytesReceived.ResetContent(); //Step through the received bytes and display each. for (ByteNumber=0; ByteNumber < Capabilities.InputReportByteLength; ByteNumber++) { //Get a byte. ReceivedByte = InputReport[ByteNumber]; //Display it. DisplayReceivedData(ReceivedByte); } } void CUsbhidiocDlg::DisplayCurrentTime() { //Get the current time and date and display them in the log List Box. CTime curTime = CTime::GetCurrentTime(); CString CurrentTime = curTime.Format( "%H:%M:%S, %B %d, %Y" ); DisplayData(CurrentTime); } void CUsbhidiocDlg::DisplayData(CString cstrDataToDisplay) { //Display data in the log List Box USHORT Index; Index=m_ResultsList.InsertString(-1, (LPCTSTR)cstrDataToDisplay); ScrollToBottomOfListBox(Index); } void CUsbhidiocDlg::DisplayLastError(CString Operation) { //Display a message and the last error in the log List Box. LPVOID lpMsgBuf; USHORT Index = 0; CString strLastError = ""; FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &lpMsgBuf, 0, NULL ); //Display the last error. strLastError = Operation + (LPCTSTR)lpMsgBuf; //Trim CR/LF from the error message. strLastError.TrimRight(); Index = m_ResultsList.InsertString(-1, strLastError); ScrollToBottomOfListBox(Index); LocalFree(lpMsgBuf); } void CUsbhidiocDlg::DisplayReceivedData(char ReceivedByte) { //Display data received from the device. CString strByteRead; //Convert the value to a 2-character Cstring. strByteRead.Format("%02X", ReceivedByte); strByteRead = strByteRead.Right(2); //Display the value in the Bytes Received List Box. m_BytesReceived.InsertString(-1, strByteRead); //Display the value in the log List Box (optional). //MessageToDisplay.Format("%s%s", "Byte 0: ", strByteRead); //DisplayData(MessageToDisplay); } void CUsbhidiocDlg::OnChangeResults() { // TODO: If this is a RICHEDIT control, the control will not // send this notification unless you override the CDialog::OnInitDialog() // function and call CRichEditCtrl().SetEventMask() // with the ENM_CHANGE flag ORed into the mask. // TODO: Add your control notification handler code here } void CUsbhidiocDlg::ScrollToBottomOfListBox(USHORT Index) { /* Scroll to the bottom of the list box. To do so, add a line and set it as the current selection, possibly scrolling the window. Then deselect the line, leaving the list box scrolled to the bottom with nothing selected. */ m_ResultsList.SetCurSel( Index ); m_ResultsList.SetCurSel( -1 ); } /* Misc. routines. */ void CUsbhidiocDlg::OnTimer(UINT nIDEvent) { //The timer event. //Read and Write one pair of reports. ReadAndWriteToDevice(); CDialog::OnTimer(nIDEvent); } void CUsbhidiocDlg::OnOK() { CDialog::OnOK(); }