关于CFile的修改

你到底是想要干吗？把edit中的内容写入文件？

这个是C8051F340 USBXpress开发包中一个利用USB进行文本内容收发的例子，现在想把它改成直接在文本框中操作的，里面有文件的操作，表示不太明白。

不是，我想把文本中的数据利用USB进行发送到缓冲区中，再用USB发送回电脑，官方的例子不是很明白。

附上官方发送接收文件的代码，希望大家帮忙看下。
// USBSPIDEVDlg.cpp : implementation file
//#include "stdafx.h"
#include "USBSPIDEV.h"
#include "USBSPIDEVDlg.h"
#include "SiUSBXp.h"
#include "dbt.h"
#include "initguid.h"DEFINE_GUID(GUID_DEVINTERFACE_USBXPRESS, 0x3C5E1462L, 0x5695, 0x4E18, \
0x87, 0x6B, 0xF3, 0xF3, 0xD0, 0x8A, 0xAF, 0x18);#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App Aboutclass 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()/////////////////////////////////////////////////////////////////////////////
// CUSBSPIDEVDlg dialogCUSBSPIDEVDlg::CUSBSPIDEVDlg(CWnd* pParent /*=NULL*/)
: CDialog(CUSBSPIDEVDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CUSBSPIDEVDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}void CUSBSPIDEVDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CUSBSPIDEVDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CUSBSPIDEVDlg, CDialog)
//{{AFX_MSG_MAP(CUSBSPIDEVDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_UPDATE_DEVICE_LIST, OnUpdateDeviceList)
ON_BN_CLICKED(IDC_RECEIVE_DATA, OnReceiveData)
ON_BN_CLICKED(IDC_TRANSFER_DATA, OnTransferData)
ON_WM_DEVICECHANGE()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CUSBSPIDEVDlg message handlersBOOL CUSBSPIDEVDlg::OnInitDialog()
{
CDialog::OnInitDialog(); // 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

// TODO: Add extra initialization here

return TRUE;  // return TRUE  unless you set the focus to a control
}void CUSBSPIDEVDlg::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 CUSBSPIDEVDlg::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 CUSBSPIDEVDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}//DEL void CUSBSPIDEVDlg::OnEditchangeDeviceSelect()
//DEL {
//DEL // TODO: Add your control notification handler code here
//DEL
//DEL }BOOL CUSBSPIDEVDlg::OnDeviceChange(UINT nEventType, DWORD dwData)
{
switch(nEventType)
{
case DBT_DEVICEARRIVAL:
// A device has been inserted and is now available.

case DBT_DEVICEREMOVECOMPLETE:
// Device has been removed.
// Confirm this notify derives from the target device
if (DBT_DEVTYP_DEVICEINTERFACE != ((DEV_BROADCAST_HDR *)dwData)->dbch_devicetype)
break;         if (GUID_DEVINTERFACE_USBXPRESS != ((DEV_BROADCAST_DEVICEINTERFACE *)dwData)->dbcc_classguid)
break;

if (DBT_DEVICEARRIVAL == nEventType)
{
FillDeviceList();
}
else
{
SI_Close(m_hUSBDevice);
m_hUSBDevice = INVALID_HANDLE_VALUE;
FillDeviceList();
}
break;

default:
break;
}

return TRUE;
}void CUSBSPIDEVDlg::OnUpdateDeviceList()
{
// TODO: Add your control notification handler code here
FillDeviceList();
}void CUSBSPIDEVDlg::FillDeviceList()
{
SI_DEVICE_STRING devStr;
DWORD dwNumDevices = 0;
CComboBox* pDevList = (CComboBox*)GetDlgItem(IDC_DEVICE_SELECT); // Make sure that pDevList is not NULL
if (pDevList)
{
// Delete all the strings in the list
for (int i = 0; i < pDevList->GetCount(); i++)
{
pDevList->DeleteString(0);
} // Get the number of USBXpress devices connected
SI_STATUS status = SI_GetNumDevices(&dwNumDevices); if (status == SI_SUCCESS)
{
// Go through each device and add their serial numbers to the list
for (DWORD d = 0; d < dwNumDevices; d++)
{
status = SI_GetProductString(d, devStr, SI_RETURN_SERIAL_NUMBER); if (status == SI_SUCCESS)
{
if (pDevList)
pDevList->AddString(devStr);
}
}
} //Set the current selection to the first item
pDevList->SetCurSel(0);
}
}
void CUSBSPIDEVDlg::OnTransferData()
{
// TODO: Add your control notification handler code here
CComboBox* pDevList = (CComboBox*)GetDlgItem(IDC_DEVICE_SELECT); BeginWaitCursor(); // Make sure that the device list is valid
if (pDevList)
{
// Open selected device and transfer the file if the selection is valid
if (pDevList->GetCurSel() >= 0)
{
SI_STATUS status = SI_Open(pDevList->GetCurSel(), &m_hUSBDevice); if (status == SI_SUCCESS)
{
// Write file to device in MAX_PACKET_SIZE_WRITE-byte chunks. WriteEditData(); // Close device.
SI_Close(m_hUSBDevice);
m_hUSBDevice = INVALID_HANDLE_VALUE;
}
}
} EndWaitCursor();
}
void CUSBSPIDEVDlg::OnReceiveData()
{
// TODO: Add your control notification handler code here
CComboBox* pDevList = (CComboBox*)GetDlgItem(IDC_DEVICE_SELECT); BeginWaitCursor(); // Make sure that the device list is valid
if (pDevList)
{
// Open selected device and read the file if the selection is valid
if (pDevList->GetCurSel() >= 0)
{
SI_STATUS status = SI_Open(pDevList->GetCurSel(), &m_hUSBDevice); if (status == SI_SUCCESS)
{
// Read file data in MAX_PACKET_SIZE_READ-byte chunks and write to temp file.
// Compare temp. file with original ReadEditData(); // Close device.
SI_Close(m_hUSBDevice);
m_hUSBDevice = INVALID_HANDLE_VALUE;
}
}
} EndWaitCursor();
}void CUSBSPIDEVDlg::OnOK()
{
// TODO: Add extra validation here
// Close handle if open
if (m_hUSBDevice != INVALID_HANDLE_VALUE)
{
// Close the USBXpress device
SI_Close(m_hUSBDevice);
m_hUSBDevice = INVALID_HANDLE_VALUE;
}

// Unregister for device notification
UnregisterNotification(); CDialog::OnOK();
}void CUSBSPIDEVDlg::RegisterNotification()
{
// Register device notification
DEV_BROADCAST_DEVICEINTERFACE devIF = {0}; devIF.dbcc_size = sizeof(devIF);
devIF.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
devIF.dbcc_classguid  = GUID_DEVINTERFACE_USBXPRESS;     m_hNotifyDevNode = RegisterDeviceNotification(GetSafeHwnd(), &devIF, DEVICE_NOTIFY_WINDOW_HANDLE);
}void CUSBSPIDEVDlg::UnregisterNotification()
{
// Unegister device notification
if(NULL != m_hNotifyDevNode)
{
UnregisterDeviceNotification(m_hNotifyDevNode); m_hNotifyDevNode = NULL;
}
}BOOL CUSBSPIDEVDlg::WriteEditData()
{
BOOL success = TRUE;
return success;}BOOL CUSBSPIDEVDlg::ReadEditData()
{
BOOL success = TRUE;
return success;}BOOL CUSBSPIDEVDlg::DeviceWrite(BYTE* buffer, DWORD dwSize, DWORD* lpdwBytesWritten, DWORD dwTimeout)
{
DWORD tmpReadTO, tmpWriteTO;
SI_STATUS status = SI_SUCCESS; // Save timeout values.
SI_GetTimeouts(&tmpReadTO, &tmpWriteTO); // Set a timeout for the write
SI_SetTimeouts(0, dwTimeout); // Write the data
status = SI_Write(m_hUSBDevice, buffer, dwSize, lpdwBytesWritten); // Restore timeouts
SI_SetTimeouts(tmpReadTO, tmpWriteTO); return (status == SI_SUCCESS);
}BOOL CUSBSPIDEVDlg::DeviceRead(BYTE* buffer, DWORD dwSize, DWORD* lpdwBytesRead, DWORD dwTimeout)
{
DWORD tmpReadTO, tmpWriteTO;
SI_STATUS status = SI_SUCCESS; // Save timeout values.
SI_GetTimeouts(&tmpReadTO, &tmpWriteTO); // Set a timeout for the read
SI_SetTimeouts(dwTimeout, 0); // Read the data
status = SI_Read(m_hUSBDevice, buffer, dwSize, lpdwBytesRead);

// Restore timeouts
SI_SetTimeouts(tmpReadTO, tmpWriteTO); return (status == SI_SUCCESS);
}

楼上的少发了发送接收的，补上
BOOL CFileTransferDlg::WriteFileData()
{
BOOL success = TRUE; // Make sure a file is specified in the dialog
if (m_sTXFileName.GetLength() > 0)
{
CFile file; // Open the file for reading
if (file.Open(m_sTXFileName, CFile::modeRead | CFile::shareDenyNone))
{
// Make sure the file size is 4KB or less
if (1)//(file.GetLength() && (file.GetLength() <= MAX_PACKET_SIZE_READ))
{
DWORD size = file.GetLength();
DWORD dwBytesWritten = 0;
DWORD dwBytesRead = 0;
BYTE buf[MAX_PACKET_SIZE_WRITE]; // Set up the write message command with the file size
buf[0] = FT_WRITE_MSG;
buf[1] = (BYTE)(size & 0x000000FF);
buf[2] = (BYTE)((size & 0x0000FF00) >> 8); // Send write file size message with a 1 second timeout
if (DeviceWrite(buf, FT_MSG_SIZE, &dwBytesWritten, 1000))
{
if (dwBytesWritten == FT_MSG_SIZE)
{
DWORD numPkts = (size / MAX_PACKET_SIZE_WRITE) + (((size % MAX_PACKET_SIZE_WRITE) > 0)? 1 : 0);
DWORD numLoops = (numPkts / MAX_WRITE_PKTS) + (((numPkts % MAX_WRITE_PKTS) > 0)? 1 : 0);
DWORD counterPkts = 0;
DWORD counterLoops = 0;
DWORD totalWritten = 0; // Now write data to board
// After each 512-byte packet, the device will send an 0xFF ACK signal
while ((counterLoops < numLoops) && success)
{
int i = 0; while ((i < MAX_WRITE_PKTS) && (counterPkts < numPkts) && success)
{
DWORD dwWriteLength = 0; // Determine if the size is the maximum, or a partial packet
if ((size - totalWritten) < MAX_PACKET_SIZE_WRITE)
{
dwWriteLength = size - totalWritten;
}
else
{
dwWriteLength = MAX_PACKET_SIZE_WRITE;
} // Read in the data for the packet from the file
memset(buf, 0, dwWriteLength);
file.Read(buf, dwWriteLength);
dwBytesWritten = 0; //Write to the device with a 1 second timeout
success = DeviceWrite(buf, dwWriteLength, &dwBytesWritten, 1000);
totalWritten += dwWriteLength;
counterPkts++;
i++;
} if (success)
{
memset(buf, 0, 1); // Check for ACK packet after writing 512 bytes or after last packet
// with a 3 second timeout
while ((buf[0] != 0xFF) && success)
{
success = DeviceRead(buf, 1, &dwBytesRead, 3000);
}
} counterLoops++;
}

if (!success)
{
AfxMessageBox("Target device failure while sending file data.\nCheck file size.");
success = FALSE;
}
}
else
{
AfxMessageBox("Incomplete write file size message sent to device.");
success = FALSE;
}
}
else
{
AfxMessageBox("Target device failure while sending file size information.");
success = FALSE;
}
}
else
{
AfxMessageBox("Limit for file size is 4KB");
success = FALSE;
} file.Close();
}
else
{
CString err;
err.Format("Failed opening file:\n%s", m_sTXFileName);
AfxMessageBox(err);
success = FALSE;
}
}
else
{
AfxMessageBox("Error:  No file selected.");
success = FALSE;
} return success;
}
BOOL CFileTransferDlg::ReadFileData()
{
BOOL success = TRUE;
    DWORD length;
if ((length = m_sRXFileName.GetLength()) > 0)
{
CFile file; // Open the temporary file for writing
if (file.Open(m_sRXFileName, CFile::modeWrite | CFile::modeCreate | CFile::shareDenyNone))
{
DWORD dwBytesRead = 0;
DWORD dwBytesWritten = 0;
BYTE buf[MAX_PACKET_SIZE_READ];
BYTE msg[FT_MSG_SIZE]; // Setup the read command buffer
msg[0] = FT_READ_MSG;
msg[1] = (BYTE)0xFF;
msg[2] = (BYTE)0xFF; // Send the read command buffer to the device with a 1 second timeout
if (DeviceWrite(msg, FT_MSG_SIZE, &dwBytesWritten, 1000))
{
DWORD size = 0;
DWORD counterPkts = 0;
DWORD numPkts = 0;
DWORD totalRead = 0; // Reset the message buffer
memset(msg, 0, FT_MSG_SIZE); // Read the response containing the size with a 3 second timeout
if (DeviceRead(buf, FT_MSG_SIZE, &dwBytesRead, 3000))
{
size = (buf[1] & 0x000000FF) | ((buf[2] << 8) & 0x0000FF00);
numPkts = (size/MAX_PACKET_SIZE_READ) + (((size % MAX_PACKET_SIZE_READ) > 0)? 1 : 0); // Now read data from board
while ((counterPkts < numPkts) && success)
{
DWORD dwReadLength = 0;
dwBytesRead = 0; // Determine if the size is the max or a partial packet
if ((size - totalRead) < MAX_PACKET_SIZE_READ)
{
dwReadLength = size - totalRead;
}
else
{
dwReadLength = MAX_PACKET_SIZE_READ;
}

memset(buf, 0, dwReadLength);

//Read the packet from the device with a 3 second timeout
if (DeviceRead(buf, dwReadLength, &dwBytesRead, 3000))
{
totalRead += dwBytesRead;
file.Write(buf, dwBytesRead);
if (dwBytesRead == dwReadLength)
{
counterPkts++;
}
}
else
{
AfxMessageBox("Failed reading file packet from target device.");
success = FALSE;
}
}

}
else
{
AfxMessageBox("Failed reading file size message from target device.");
success = FALSE;
}
}
else
{
AfxMessageBox("Failed sending read file message to target device.");
success = FALSE;
} if (file.GetLength() == 0)
{
CString err;
err.Format("File has 0 length:\n%s", m_sRXFileName);
AfxMessageBox(err);
} file.Close();
}
else
{
CString err;
err.Format("Failed opening file:\n%s", m_sRXFileName);
AfxMessageBox(err);
success = FALSE;
}
}
else
{
AfxMessageBox("Error:  No file selected.");
success = FALSE;
} return success;
}

调试易

关于CFile的修改

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