C / C++ / MFC

Re: loading dll second time giving error "A required resource was unavailable"

1-Mar-12 6:25

i wanted a view on the dialog. so i derived from cview and created the view in the dialog. 1st time everything is coming fine. but without closing the client application if i try to launch again the dialog then it's giving error. Please give me some suggestion how can i get rid of it. Thanks

Jochen Arndt1-Mar-12 6:34

Jochen Arndt

1-Mar-12 6:34

The problem is that the view is not properly closed. But even if you would close it properly, there will be other problems. A CView is not designed to be a child view of a dialog. It must be a child of a CFrameWnd derived class. Change your CView class to be based on a CWnd.

Re: loading dll second time giving error "A required resource was unavailable"

Chris Meech1-Mar-12 6:40

Chris Meech

1-Mar-12 6:40

And demonstrating a great deal of restraint as well. Good for you. Smile | :)

Chris Meech
I am Canadian. [heard in a local bar]

In theory there is no difference between theory and practice. In practice there is. [Yogi Berra]

posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]

Re: loading dll second time giving error "A required resource was unavailable"

appollosputnik1-Mar-12 16:34

Re: loading dll second time giving error "A required resource was unavailable"

1-Mar-12 16:34

wherever i used GetDc() i have done ReleaseDC...Still the error is coming, "A required resource was unavailable". Please help me to resolve this. why 2nd time my application is not launching.? please tell whatelse I need to do ? Thanks

Richard MacCutchan1-Mar-12 20:42

Re: loading dll second time giving error "A required resource was unavailable"

1-Mar-12 20:42

sujandasmahapatra wrote:
please tell whatelse I need to do ?

You probably need to do some serious debugging, firstly to find out why and where this message is produced.

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

appollosputnik1-Mar-12 21:54

Re: loading dll second time giving error "A required resource was unavailable"

1-Mar-12 21:54

it's giving this error

First-chance exception at 0x7c812afb in TestRev.exe: Microsoft C++ exception: CResourceException at memory location 0x0012ed28..

Crashing in wincore.cpp -- AfxRegisterClass(WNDCLASS* lpWndClass)

Richard MacCutchan1-Mar-12 23:12

Re: loading dll second time giving error "A required resource was unavailable"

1-Mar-12 23:12

And what does that tell us? Pretty much nothing. You need to look at your code where this error occurs and find out what your program is doing, or trying to do: that is where the error lies.

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

appollosputnik1-Mar-12 20:19

Re: loading dll second time giving error "A required resource was unavailable"

1-Mar-12 20:19

Can u give me your mail id so that I can send you the project. Can u help me ?

Jochen Arndt1-Mar-12 21:46

Jochen Arndt

1-Mar-12 21:46

Sorry, but I don't want to write your code. I - and most others here - just enjoy helping.

The design of your application is definitely broken. That is your problem. Tampering with the existing code is the wrong way. Reconsider the design. Read about dialogs hosting user controls.

Re: loading dll second time giving error "A required resource was unavailable"

appollosputnik2-Mar-12 3:59

How to read USB type Disk Drive device?

2-Mar-12 3:59

I have got the problem I have implemented the PrecreateWindow for my view class.
just check this code.

[code]
BOOL CMyView::PreCreateWindow(CREATESTRUCT& cs)
{
cs.lpszClass = ::AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS | CS_OWNDC,::LoadCursor(NULL, IDC_ARROW), NULL, NULL);

cs.style |= WS_CLIPSIBLINGS | WS_CLIPCHILDREN;

cs.dwExStyle = WS_EX_CLIENTEDGE;

return CView::PreCreateWindow(cs);
}
[/code]

If I remove the first line, i.e
cs.lpszClass = ::AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS | CS_OWNDC,::LoadCursor(NULL, IDC_ARROW), NULL, NULL);
then my dll window is coming all the times from the client call. But it's flickering .
So now please help me what can I do to resolve this. I think some of you must have understood the problem, please help me. Thanks a lot.

Le@rner29-Feb-12 21:42

29-Feb-12 21:42

hi all,

can any one help me to read USB type Disk Drive device.

please help me from where i can start.

thanks in advance.

Richard MacCutchan29-Feb-12 22:38

29-Feb-12 22:38

Please make an effort to try this[^] first.

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

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.

Richard MacCutchan1-Mar-12 2:19

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

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.

Le@rner1-Mar-12 18:04

1-Mar-12 18:04

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

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.

Le@rner1-Mar-12 20:53

1-Mar-12 20:53

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

David Crow2-Mar-12 2:41

David Crow

2-Mar-12 2:41

Have you tried ReadFile()?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous

Le@rner4-Mar-12 17:55

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.

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.

Le@rner5-Mar-12 18:56

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

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?

Le@rner6-Mar-12 17:15