Re: How to read USB type Disk Drive device? - C / C++ / MFC Discussion Boards

Re: How to read USB type Disk Drive device?

Le@rner1-Mar-12 1:34

1-Mar-12 1:34

can u please more specific,how to detect and open this

coz its not open using serial port and CreateFile method.

thanks.

Re: How to read USB type Disk Drive device?

Richard MacCutchan1-Mar-12 2:19

Richard MacCutchan

1-Mar-12 2:19

Le@rner wrote:
can u please more specific

Afraid not; as with most questions like this, you need to go and do some research into what features are available and how you can implement them to solve your problem(s).

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Re: How to read USB type Disk Drive device?

Albert Holguin1-Mar-12 11:26

Albert Holguin

1-Mar-12 11:26

What are you trying to accomplish? ...this question is not clear. If it's a plain storage disk drive, and you're trying to read/write to it, it's the same as reading and writing to any file on your C:\. You just have to specify the full path of the files. The IO is handled by the drivers.

Re: How to read USB type Disk Drive device?

Le@rner1-Mar-12 18:04

Le@rner

1-Mar-12 18:04

i want to access the Card reader that is connect as drive.

Re: How to read USB type Disk Drive device?

Albert Holguin1-Mar-12 18:52

Albert Holguin

1-Mar-12 18:52

What do you want to do though? Are you trying to write to it? Do you not know what logical drive was assigned to it? Be more specific.

Re: How to read USB type Disk Drive device?

Le@rner1-Mar-12 20:53

Le@rner

1-Mar-12 20:53

i just want to read this?and read data of smart card is inserted in it.

Re: How to read USB type Disk Drive device?

David Crow2-Mar-12 2:41

David Crow

2-Mar-12 2:41

Have you tried ReadFile()?

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Re: How to read USB type Disk Drive device?

Le@rner4-Mar-12 17:55

Le@rner

4-Mar-12 17:55

it means open it with CreateFile?

what parameter pass here for file name like \\.\driveletter: or anything else.

when i CreateFile using "\\.\driveletter:" and ReadFile than its return 0 and getlasterror is "The Parameter is incorrect".

and when i open it as physicaldrive its give "the device is not ready"

so now waht can i do?

and also tell me how can i diffrentiate this from other drive.

please guide me.

thanks.

modified 5-Mar-12 0:11am.

Re: How to read USB type Disk Drive device?

David Crow5-Mar-12 2:29

David Crow

5-Mar-12 2:29

Le@rner wrote:
what parameter pass here for file name like \\.\driveletter: or anything
else.

See this discussion.

Re: How to read USB type Disk Drive device?

Le@rner5-Mar-12 18:56

Le@rner

5-Mar-12 18:56

C++

	HDEVINFO        hDevInfo, hIntDevInfo;
    BOOL            disk_status=FALSE;


    hDevInfo = SetupDiGetClassDevs(
                    (LPGUID) &GUID_DEVCLASS_DISKDRIVE,
                    NULL,
                    NULL, 
                    DIGCF_PRESENT  ); // All devices present on system
    if (hDevInfo == INVALID_HANDLE_VALUE)
    {
       
        return 0;
    }

   
    hIntDevInfo = SetupDiGetClassDevs (
                 (LPGUID)&GUID_DEVCLASS_DISKDRIVE,
                 NULL,                                   // Enumerator
                 NULL,                                   // Parent Window
                 (DIGCF_PRESENT | DIGCF_INTERFACEDEVICE  // Only Devices present & Interface class
                 ));

    if( hDevInfo == INVALID_HANDLE_VALUE ) 
	{
        
        return 0;
	}

	SP_DEVICE_INTERFACE_DATA            interfaceData;
    PSP_DEVICE_INTERFACE_DETAIL_DATA    interfaceDetailData = NULL;
   
    PUCHAR                              disk_p;
    UCHAR                               outBuf[512];
    ULONG                               length = 0,
                                        returned = 0,
                                        returnedLength=0;
    DWORD                               interfaceDetailDataSize,
                                        reqSize,
                                        errorCode, 
                                        disk_i=0;


	DWORD Index=0;

    interfaceData.cbSize = sizeof (SP_INTERFACE_DEVICE_DATA);

    disk_status = SetupDiEnumDeviceInterfaces ( 
                hIntDevInfo,             // Interface Device Info handle
                0,                      // Device Info data
                (LPGUID)&GUID_DEVCLASS_DISKDRIVE, // Interface registered by driver
                Index,                  // Member
                &interfaceData          // Device Interface Data
                );

    if ( disk_status == FALSE ) 
	{
        errorCode = GetLastError();
        if ( errorCode == ERROR_NO_MORE_ITEMS ) 
		{
            //No more interfaces
        }
        else 
		{
            //SetupDiEnumDeviceInterfaces failed 
        }
        return 0;
    }
        
    

    disk_status = SetupDiGetDeviceInterfaceDetail (
                hIntDevInfo,         // Interface Device info handle
                &interfaceData,     // Interface data for the event class
                NULL,               // Checking for buffer size
                0,                  // Checking for buffer size
                &reqSize,           // Buffer size required to get the detail data
                NULL                // Checking for buffer size
                );

   

    if ( disk_status == FALSE ) 
	{
        errorCode = GetLastError();
        if ( errorCode != ERROR_INSUFFICIENT_BUFFER ) {
            //SetupDiGetDeviceInterfaceDetail failed 
            return 0;
        }
    }

   

    interfaceDetailDataSize = reqSize;
    
	interfaceDetailData = (PSP_DEVICE_INTERFACE_DETAIL_DATA) malloc (interfaceDetailDataSize);
    
	if ( interfaceDetailData == NULL ) 
	{
        
        return 0;
    }
    interfaceDetailData->cbSize = sizeof (SP_INTERFACE_DEVICE_DETAIL_DATA);

    disk_status = SetupDiGetDeviceInterfaceDetail (
                  hIntDevInfo,               // Interface Device info handle
                  &interfaceData,           // Interface data for the event class
                  interfaceDetailData,      // Interface detail data
                  interfaceDetailDataSize,  // Interface detail data size
                  &reqSize,                 // Buffer size required to get the detail data
                  NULL);                    // Interface device info

    if ( disk_status == FALSE ) {
        
        return 0;
    }

   

    serial_handle = CreateFile(
                interfaceDetailData->DevicePath,    // device interface name
                GENERIC_READ | GENERIC_WRITE,       // dwDesiredAccess
                FILE_SHARE_READ | FILE_SHARE_WRITE, // dwShareMode
                NULL,                               // lpSecurityAttributes
                OPEN_EXISTING,                      // dwCreationDistribution
                0,                                  // dwFlagsAndAttributes
                NULL                                // hTemplateFile
                );

Open device successfullt, but read file return 0;

success = ReadFile(serial_handle,&rxBuffer,max_rx_size,&read_nbr,NULL);

please help me where i m wrong

Re: How to read USB type Disk Drive device?

David Crow6-Mar-12 2:32

David Crow

6-Mar-12 2:32

Le@rner wrote:
please help me where i m wrong

You've failed to say what is wrong.

Have you used the debugger to step through the code?

Re: How to read USB type Disk Drive device?

Le@rner6-Mar-12 17:15

Le@rner

6-Mar-12 17:15

ya ReadFile return Zero.

Re: How to read USB type Disk Drive device?

David Crow6-Mar-12 17:53

David Crow

6-Mar-12 17:53

And then what did GetLastError() return?

Re: How to read USB type Disk Drive device?

Le@rner12-Mar-12 20:41

Le@rner

12-Mar-12 20:41

GetLastError return "0x00000456 The media in the drive may have changed. "

Re: How to read USB type Disk Drive device?

David Crow13-Mar-12 3:18

David Crow

13-Mar-12 3:18

Does this happen after the system comes out of Standby mode?

create statusBar in dialog problem

appollosputnik29-Feb-12 15:31

appollosputnik

29-Feb-12 15:31

I am trying to create a statusBar in the dialog but it's returning false. not creating the status bar please tell me whats going wrong in this. Thanks for any help. I am creating the status bar in the OnInitDialog() function

[code]

CStatusBar m_wndStatusBar; // member variable in the dialog header.

BOOL CDlgsViewDlg::OnInitDialog()
{
CDialog::OnInitDialog();
if (!m_wndStatusBar.Create(this) ||
!m_wndStatusBar.SetIndicators(indicators,
sizeof(indicators)/sizeof(UINT)))
{
TRACE0("Failed to create status bar\n");
return FALSE; // fail to create
}

m_wndStatusBar.SetPaneText(0,L"MainWindow Initialized");
}
[/code]

it's returning false. please help me.

Re: create statusBar in dialog problem

chenxi_129-Feb-12 18:00

chenxi_1

29-Feb-12 18:00

see http://www.cppblog.com/besterChen/archive/2009/04/03/78846.html[^]
Language： chs

Re: create statusBar in dialog problem

Chandrakantt29-Feb-12 18:53

Chandrakantt

29-Feb-12 18:53

You can create status bar by calling

m_wndStatusBar.Create(WS_CHILD|WS_VISIBLE|SBT_OWNERDRAW,
    CRect(0,0,0,0), this, 0);

You can have a look at Toolbar & StatusBar on Dialog[^]

Re: create statusBar in dialog problem

appollosputnik1-Mar-12 0:19

appollosputnik

1-Mar-12 0:19

thanks a lot it's working now.

Menu items disabled but appear enabled

cpp_prgmer29-Feb-12 9:27

cpp_prgmer

29-Feb-12 9:27

I am disabling some menu items based on a condition but after some dialog launch in the application, these menu item appearance changes to those of enabled.
However, when I click them their appearance changes to that of a disabled button. I can also do this by simply switching focus or simply by minimize-restore of application.
Why does the menu item change appearance? How can I prevent that from happening?

Re: Menu items disabled but appear enabled

David Crow29-Feb-12 9:56

David Crow

29-Feb-12 9:56

Is this an MFC application? How are you disabling the menu items? From where, and how, are you launching the dialog box?

Re: Menu items disabled but appear enabled

cpp_prgmer29-Feb-12 10:56

cpp_prgmer

29-Feb-12 10:56

Yes this is a MFC application which works similar to the CProperty sheet wizard style but with CDialogs.
I am disabling the menu items in the frame class when the first dialog appears at start of the application but somewhere in between when other dialogs come up the appearance of the disabled menu items is changing from disabled to enabled.

Re: Menu items disabled but appear enabled

Maximilien29-Feb-12 13:57

Maximilien

29-Feb-12 13:57

To enable/disable menu items it is best practice to use the ON_UPDATE_COMMAND_UI message.

It also best practice to use a SDI (with a CFormView) application if menus are needed.

Watched code never compiles.

Re: Menu items disabled but appear enabled

cpp_prgmer1-Mar-12 3:56

cpp_prgmer

1-Mar-12 3:56

Thanks for your advice. But turns out if you try to disable the menubar items after system creates window, you need to call DrawMenuBar().
Source of explanation: http://stackoverflow.com/questions/1835209/how-can-i-disable-and-gray-the-top-level-menu-item-using-mfc?answertab=oldest#tab-top[^]
This solves my problem... Hope this helps anyone else having similar issues.

Re: Menu items disabled but appear enabled

Randor 29-Feb-12 17:47

Randor

29-Feb-12 17:47

Hi,

It sounds to me as if your doing something that is screwing up the MFC command routing. However based on your brief description I have no ideas as to what it could be. Did you check to see if the menu items have a unique resource ID?

Best Wishes,
-David Delaune

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