C / C++ / MFC

14-Apr-09 19:32

Hi All

I have a problem to get information of connected USB Device.I am useing

OnMyDeviceChange(WPARAM wParam, LPARAM lParam);

function which is provide me all information.But when USB Device is connected all ready and my application is start after connecteion of USB Device then i havn't found any information of USB Device.Can any one give me advice to how to get connected USB Device information.Plz help me

Xing Chen14-Apr-09 19:59

14-Apr-09 19:59

1.You must use RegisterDeviceNotification() to let system notify you application.
2.Add message handler for WM_DEVICECHANGE.

Davitor14-Apr-09 20:43

14-Apr-09 20:43

i am useing both RegisterDeviceNotification and WM_DEVICECHANGE.And i am getting information when my application is running and USB Device is connect.But When my application is not running and USB drive is connected and my application is start after connection of USB Device then information is not showing.But USb Device is still connected.

So problem is that how to get information allready connection of USB Device.Plz help me

Xing Chen14-Apr-09 21:34

14-Apr-09 21:34

To get USB Device informations which already connected to system, use SetupDiEnumDeviceInfo()
take this article as reference: Detecting Hardware Insertion and/or Removal[^]

Hope this[^] sample code can help you too.

Hamid_RT14-Apr-09 20:22

14-Apr-09 20:22

See http://www.beyondlogic.org/[^].

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Randor 14-Apr-09 23:12

Randor

14-Apr-09 23:12

Your RegisterDeviceNotification[^] code is probably working correctly, however it will only detect changes while your application is running.

You failed to mention what type of USB device your application needs to enumerate. I will assume that you need all USB device types. You will essentially need to call SetupDiGetClassDevs[^] and pass the enumerator filter of "USB". Dont be frightened by the Windows Driver Kit references in the MSDN documentation. You will be able to use the SetupAPI without the DDK installed, although I believe you will need Platform SDK/Microsoft SDK.

The following link should be enough to get you started:
How to enumerate hardware devices by using SetupDi calls[^]

You should modify the Microsoft sample code to something like the following:

#pragma comment (lib,"Setupapi.lib")
hDevInfo = SetupDiGetClassDevs(NULL,"USB", 0,DIGCF_PRESENT | DIGCF_ALLCLASSES );

You can perform additional device filtering using the System-Supplied Device Setup Classes[^] or other Enumerator strings such as "USBSTOR".

Best Wishes,
-David Delaune

Jonathan Davies15-Apr-09 1:22

Jonathan Davies

15-Apr-09 1:22

Hi,
Have a look at the my article [^] which describes a class a wrote for detecting devices. The example screen shots show the detection of USB devices, amongst others. The code example

const GUID Guid = GUID_DEVCLASS_USB;
CDevInfo cDevInfo(m_hWnd, DIGCF_PRESENT , &Guid);

shows how to use the class to detect just USB devices actually present.

Davitor15-Apr-09 1:40

15-Apr-09 1:40

Getting error

al error C1083: Cannot open include file: 'atlapp.h': No such file or directory

Jonathan Davies15-Apr-09 1:53

Jonathan Davies

15-Apr-09 1:53

AtlApp.h is part of WTL. The article uses WTL for the windows, dialogs, listboxes etc. I guess you're using MFC?

Davitor15-Apr-09 2:04

15-Apr-09 2:04

yes i am useing MFC.

Jonathan Davies15-Apr-09 2:53

Jonathan Davies

15-Apr-09 2:53

OK, the classes depend on WTL, but I just tried some code an MFC dialog and started getting names of devices. I put this in OnInitDialog to test it as the first wizard generated comment shows. Try it. You'll need to #include devguid.h; and then put a break point on nMemberIndex++; and look at the name in szFriendlyName. After the first name go round the loop looking at the names.

// TODO: Add extra initialization here
const GUID Guid = GUID_DEVCLASS_PORTS;
DWORD Flags = DIGCF_PRESENT |  DIGCF_DEVICEINTERFACE;
HDEVINFO hDevInfo = SetupDiGetClassDevs(&Guid, 0, 0, Flags);


BOOL bDevInfo;
int nMemberIndex = 0;
do{
    SP_DEVINFO_DATA spDevInfoData;
    spDevInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
    bDevInfo = ::SetupDiEnumDeviceInfo(hDevInfo, nMemberIndex, &spDevInfoData);

    DWORD Property = SPDRP_FRIENDLYNAME;
    wchar_t  szFriendlyName[1024] = {0};
    BOOL bGotRegProp = ::SetupDiGetDeviceRegistryProperty(hDevInfo, &spDevInfoData,
                                                      Property,
                                                      0L,
                                                      (PBYTE)szFriendlyName,
                                                      2048,
                                                      0);

    nMemberIndex++;
}
while(bDevInfo);

Once you have this working then change GUID_DEVCLASS_PORTS for something that finds your device, but start with it as it is then were running the same code.

GIF showing problem

subhabasu14-Apr-09 18:49

14-Apr-09 18:49

Hi all,
I am trying to show single-frame/animated GIF images in a window created by 'CreateWindowEx'. I have used Image *, Graphics * (method DrawImage(Image *, INT, INT, INT, INT)) of GdiPlus dll. I used memry DC to avoid flickering. This was working fine.
Now the problem is that - When I add 2 commands /DYNAMICBASE and /NXCOMPAT in linker command line (VS 2005 project settings), the application simply crashes when trying to show any kind of GIF image. Although it is showing BMP, DIB, WMF, JPG, JPEG and TIFF images perfectly.
To see where the actual problem is i ran it in debug mode and find GdiPlus::Graphics::DrawImage fail to process. The Application Verifier 4.0 points that it is due to some bad address pointer. The astonishinig matter is that, in debug mode if I ignore the crash and click on 'Continue', the 'DrawImagw' returns StatusResult "Ok" and 'BitBilt' draws the image perfectly in my application window.
Thanks in advance, for helping me out of this situation.
Subha

Xing Chen14-Apr-09 20:02

14-Apr-09 20:02

why not use try-catch block to fix this problem?

subhabasu14-Apr-09 20:13

14-Apr-09 20:13

Thanks for the suggesstion Xing. Since I am writting code in pur C++ and using Win32 APIs, I didn't found what is the exception class I should use to catch it. If you can suggest me, that'll be better for me.

Hamid_RT14-Apr-09 20:26

14-Apr-09 20:26

See Exceptions[^].

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

ThatsAlok14-Apr-09 23:14

ThatsAlok

14-Apr-09 23:14

subhabasu wrote:
, I didn't found what is the exception class

Though i know, this is not a good approach, but here you can use this block to catch all the exception :-

try
{

 // your drawing code here
}
catch(...)
{
}

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

subhabasu14-Apr-09 20:28

14-Apr-09 20:28

Thanks Xing and Hamid,
I even tried with
try{
// My code snippet
}
catch(...)
{
::Messagebox(0,0,0,0);
}

It does not enter in catch part. I am feeling sick of this Confused | :confused:

Hamid_RT14-Apr-09 20:37

14-Apr-09 20:37

What was the error and did you use of your program on the vista?

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

subhabasu14-Apr-09 20:51

14-Apr-09 20:51

Hi Hamid,
Now, I find where the problem occurrs. It is nothing to do with the project setting /DYNAMICBASE or /NXCOMPAT in Linker command line.
The application only crashes if I run it with Application Verifier 4.0. Otherwise it is able to show (DrawImage) any kind of GIF image.
I am giving a part of the xml file generated by the Application Verifier 4.0. I hope it will help you to understand the error properly, which I could not resolve till now.

<avrf:logEntry Time="2009-04-15 : 12:18:56" LayerName="Heaps" StopCode="0x13" Severity="Error">
<avrf:message>First chance access violation for current stack trace.</avrf:message>
<avrf:parameter1>5960002 - Invalid address causing the exception.</avrf:parameter1>
<avrf:parameter2>4ed9b280 - Code address executing the invalid access.</avrf:parameter2>
<avrf:parameter3>129838 - Exception record.</avrf:parameter3>
<avrf:parameter4>129854 - Context record.</avrf:parameter4>

Hamid_RT14-Apr-09 21:04

14-Apr-09 21:04

Did you use of this code on your code?
__try
{

}
__except( EXCEPTION_EXECUTE_HANDLER)
{

}

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

subhabasu14-Apr-09 22:17

14-Apr-09 22:17

Hi Hamid and Xing,

Many many thanks for your suggestion. I tried what both of you have said. But that was giving "error C2712: Cannot use __try in functions that require object unwinding" in my VS 2005. Anyway I solved that error by setting "Enable C++ Exceptions" to "No". Now I can track the exception, though generating too many warnings at compile time (for disabling C++ exceptions). So, the application doesn't crashes anymore.
Anyway, I need to show the GIF images. So, how can I do that after getting that exception - EXCEPTION_EXECUTE_HANDLER. What should I do Frown | :(

Xing Chen14-Apr-09 21:48

Microsoft Specific try-except Statement[^]

14-Apr-09 21:48

subhabasu14-Apr-09 23:49