|
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
|
|
|
|
|
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.
|
|
|
|
|
Getting error
al error C1083: Cannot open include file: 'atlapp.h': No such file or directory
|
|
|
|
|
AtlApp.h is part of WTL. The article uses WTL for the windows, dialogs, listboxes etc. I guess you're using MFC?
|
|
|
|
|
|
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.
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.
|
|
|
|
|
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
|
|
|
|
|
why not use try-catch block to fix this problem?
|
|
|
|
|
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.
|
|
|
|
|
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 )
|
|
|
|
|
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
{
}
catch(...)
{
}
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You
|
|
|
|
|
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
|
|
|
|
|
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 )
|
|
|
|
|
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>
|
|
|
|
|
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 )
|
|
|
|
|
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 
|
|
|
|
|
|
Hi Xing,
Thanks for your enthuasism, what you and Hamid have shown to my problem.
I used that __try-__exception() block. Inside that I call 'GetExceptionCode' API, which returns me the error code 0x80000003. It means EXCEPTION_BREAKPOINT (#define EXCEPTION_BREAKPOINT STATUS_BREAKPOINT in winbase.h). And in winnt.h STATUS_BREAKPOINT is defined as 0x80000003. So, right now I am here, back again in the square.
I don't understand what is the problem with Application Verifier 4.0. Without tracking by it, the application works fine.
|
|
|
|
|
I guess Application Verifier use more strict strategy, just like you can compile project with /W4 option.
|
|
|
|
|
what are the changes required to open a vs 2008 project into vs 2005?
|
|
|
|
|
Purish Dwivedi wrote: what are the changes required to open a vs 2008 project into vs 2005?
Don't think that it would be easy to do this. you may better ask this in the Visual Studio Forum
You can create a new project in VS2005 and add your existing files from VS2008 to this project. Be careful that you are not using API's added in VS2008 in your code.
You need to google first, if you have "It's urgent please" mentioned in your question.
 _AnShUmAn_
|
|
|
|
|
It's not working.
It needs some change in version in the .sln file,I think so....
|
|
|
|
|
What is not working? The idea given by me or opening Vs2008 file in Vs2005 fails. I think the format for the two version's .sln files would also be different.
You need to google first, if you have "It's urgent please" mentioned in your question.
_AnShUmAn_
|
|
|
|
|
_AnsHUMAN_ wrote: Be careful that you are not using API's added in VS2008 in your code.
There are no APIs that 'belongs' to any particular version of VS. You're probably talking about the SDK.
Or, if you were talking about compiler specific features like the TR1 library extensions, then there would be no way to run it on a compiler that doesn't implement it anyways.
It is a crappy thing, but it's life -^ Carlo Pallini
|
|
|
|
|
Hello
If you are just using standard features which are also available with VS2005, just change version number to 8.0 and also do relative changes and apply the same for vcproj file (just version number change,etc.). I learnt this in here from someone couple of weeks ago and it is working for me so far.
Hope this helps.
Bekir.
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
