C / C++ / MFC

Re: Critical section failed!

6-Aug-08 0:37

Can you post relevant code?

Regards,
Sandip.

SRKSHOME6-Aug-08 1:30

SRKSHOME

6-Aug-08 1:30

here it goes.this is my critical section class. Whenever I want critical section I will just create object of this class and call request() and release() functions to lock and unlock.It is giving me run time exception in the destructor of this class. When executing this destructor(DeleteCritical section) it is saying critical sectio not initialised.

class DSCriticalSection
{
public:

DSCriticalSection()
: m_nLockCount(0)
{
InitializeCriticalSection(&_section );
}
~DSCriticalSection()
{
DeleteCriticalSection( &_section );
}

inline void Request() const
{
EnterCriticalSection( &_section );
::InterlockedIncrement(&m_nLockCount);

}

inline void Release() const
{
if (::InterlockedExchange(&m_nLockCount, m_nLockCount) > 0)
{
::InterlockedDecrement(&m_nLockCount);
LeaveCriticalSection( &_section );
}
}

inline long GetLockCount() const
{
return m_nLockCount;
}

private:
mutable CRITICAL_SECTION _section;
mutable long m_nLockCount;
};

Re: Critical section failed!

SandipG 6-Aug-08 1:36

How to change a single toolbar icon at runtime?

6-Aug-08 1:36

Did you verify that your destructor is getting called only once??

MSDN Says
After a critical section object has been deleted, do not reference the object in any function that operates on critical sections (such as EnterCriticalSection, TryEnterCriticalSection, and LeaveCriticalSection) other than InitializeCriticalSection and InitializeCriticalSectionAndSpinCount. If you attempt to do so, memory corruption and other unexpected errors can occur.

Regards,
Sandip.

madmax00015-Aug-08 23:54

madmax0001

5-Aug-08 23:54

Hello,

I have a toolbar with several icons in it and there is one icon that I must change at runtime. How can I manage this?
I have tried someting like this, but the code crashes...

CToolBarCtrl& tb = m_wndToolBar.GetToolBarCtrl();
int iButtonCount = tb.GetButtonCount();

CDC dcMemToolbar;
CDC dcMemSrc;
CBitmap SrcBmp;
CBitmap NewBmp;
CBitmap* pOldSrcBmp = NULL;
CDC* pDc = GetDC();
dcMemToolbar.CreateCompatibleDC(pDc);
dcMemSrc.CreateCompatibleDC(pDc);

SrcBmp.LoadBitmap(IDB_TOOLBAR);
pOldSrcBmp = dcMemSrc.SelectObject(&SrcBmp);
dcMemToolbar.BitBlt(0, 0, iButtonCount*16, 16, &dcMemSrc, 0, 0, SRCCOPY);

NewBmp.LoadBitmap(IDB_INVALID_ICON);
dcMemSrc.SelectObject(&NewBmp);
dcMemToolbar.BitBlt(0, 0, 16, 16, &dcMemSrc, 0, 0, SRCCOPY);

dcMemSrc.SelectObject(pOldSrcBmp);

m_wndToolBar.SetBitmap(SrcBmp);

Thank you

Re: How to change a single toolbar icon at runtime?

Sarath C6-Aug-08 0:12

Sarath C

6-Aug-08 0:12

Better to handle using CImageList it will be easy and convenient. Please try in this way.

-Sarath.
"Great hopes make everything great possible" - Benjamin Franklin

My blog - Sharing My Thoughts, An Article - Understanding Statepattern

merge proxy/stub code in ATL server

George_George5-Aug-08 23:46

George_George

5-Aug-08 23:46

Hello everyone,

What is the scene behind the option of merge proxy/stub code in ATL project? My confusion is, COM (in-process server) is a DLL, proxy is another DLL normally, how could two DLLs be merged into one DLL?

thanks in advance,
George

led mike6-Aug-08 4:32

led mike

6-Aug-08 4:32

George_George wrote:
My confusion is, COM (in-process server) is a DLL, proxy is another DLL normally, how could two DLLs be merged into one DLL?

For the most part, you can put whatever you want in a DLL. Perhaps you could be more specific about your confusion?

led mike

George_George6-Aug-08 19:40

George_George

6-Aug-08 19:40

Thanks led mike,

I have made more study by myself. Do you think my following understading are both correct?

- If separate coclass code and proxy code into two DLLs, under Windows registry, we need to register coclass DLL under coclass CLSID and register proxy DLL proxy coclass CLSID;

- If bundle coclass code with proxy code, under Windows registry, we register both the DLL (bundled) under both original coclass CLSID and proxy coclass CLSID.

Both are correct?

regards,
George

led mike7-Aug-08 7:13

led mike

7-Aug-08 7:13

George_George wrote:
- If separate coclass code and proxy code into two DLLs, under Windows registry, we need to register coclass DLL under coclass CLSID and register proxy DLL proxy coclass CLSID;

- If bundle coclass code with proxy code, under Windows registry, we register both the DLL (bundled) under both original coclass CLSID and proxy coclass CLSID.

Both are correct?

I don't know because I don't really understand what you said, but basically because you start each statement with "if" I would say, NO not correct.

You seem to be over complicating the issue, something it seems you frequently do. There is no "if". There must be a registry entry pointing to the DLL that the component is in, period. No "if" for pointing to the DLL, it must be done, always, period.

Your question seems to be focused on the COM Proxy. To find the Proxy the registry mapping entry[^] is used. Since this mapping is a pointer to another CLSID then that CLSID must have an entry that points the DLL just as we stated above.

Also Make sure you understand COM Apartments and Marshalling[^] to be able to understand the Proxy Registry entries.

led mike

How to loop through a directory

George_George8-Aug-08 23:30

George_George

8-Aug-08 23:30

Thanks led mike,

I have made some study. Sorry that I think my bad description before makes your confused. English is not my native language. Smile | :)

Could you help to review whether my following understandings are correct?

1. when using merge option in ATL, only one DLL file will be generated, and it will be registered under both original coclass CLSID and the IID mapped proxy CLSID;

2. when not using merge option in ATL, two DLLs will be generated, one for original coclass object and the other for the proxy object, and they are registered separately under original coclass CLSID/ and the IID mapped proxy CLSID.

regards,
George

santhoshv845-Aug-08 23:40

santhoshv84

5-Aug-08 23:40

Hi Friends,

I need to get all the files from a directory in an array. But i cant use CFileDialog..

The path is constant like "C:\\JPEG". From this folder i need to get all the files.

Could any one help me find out.

Thanks in advance...

Thanks and Regards.
SANTHOSH V

_AnsHUMAN_ 6-Aug-08 0:02

_AnsHUMAN_

6-Aug-08 0:02

FindFirstFile/FindNextFile

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Sarath C6-Aug-08 0:06

Sarath C

6-Aug-08 0:06

See the sample from MSDN. Hope you can use MFC

void Recurse(LPCTSTR pstr)
{
   CFileFind finder;

   // build a string with wildcards
   CString strWildcard(pstr);
   strWildcard += _T("\\*.*");

   // start working for files
   BOOL bWorking = finder.FindFile(strWildcard);

   while (bWorking)
   {
      bWorking = finder.FindNextFile();

      // skip . and .. files; otherwise, we'd
      // recur infinitely!

      if (finder.IsDots())
         continue;

      // if it's a directory, recursively search it

      if (finder.IsDirectory())
      {
         CString str = finder.GetFilePath();
         TRACE(_T("%s\n"), (LPCTSTR)str);
         Recurse(str);
      }
   }

   finder.Close();
}

void PrintDirs()
{
   Recurse(_T("C:\\JPG"));
}

-Sarath.
"Great hopes make everything great possible" - Benjamin Franklin

My blog - Sharing My Thoughts, An Article - Understanding Statepattern

Sarath C6-Aug-08 0:10

Sarath C

6-Aug-08 0:10

alternate methods are to use CRT _findfirst/_findnext[^]
or Win32 FindFirstFile/FindNextFile[^] Functions

-Sarath.
"Great hopes make everything great possible" - Benjamin Franklin

My blog - Sharing My Thoughts, An Article - Understanding Statepattern

Re: How to loop through a directory [modified]

Jijo.Raj6-Aug-08 0:09

Jijo.Raj

6-Aug-08 0:09

Use the CFileFind class.

1) Use CFileFind::FindFile() and CFileFind::FindNextFile() to iterate through the directories and files.
2) Use CFileFind::IsDirectory() function to determine whether its file/folder and just add it to your array.
3) You can get the file name by using CFileFind::GetFileName() and file path by calling CFileFind::GetFilePath().

if you need the windows api itself, have a look at FindFirstFile() and FindNextFile().

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

SandipG 6-Aug-08 0:11

6-Aug-08 0:11

~~Little late..~~

Some body didn't like it Frown | :(

Regards,
Sandip.

modified on Wednesday, August 6, 2008 6:59 AM

Jijo.Raj6-Aug-08 0:14

Jijo.Raj

6-Aug-08 0:14

My keyboard is a bit slow. Laugh | :laugh:

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Jijo.Raj6-Aug-08 1:01

Jijo.Raj

6-Aug-08 1:01

Don't worry pal!
I've voted a 5. Wink | ;)

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

CreateFile OPEN_EXISTING problem in Vista

David Crow6-Aug-08 7:20

David Crow

6-Aug-08 7:20

santhoshv84 wrote:
I need to get all the files from a directory in an array. But i cant use CFileDialog..

Even if you could, why would you want/need to? Confused | :confused:

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

NiceNaidu5-Aug-08 23:37

NiceNaidu

5-Aug-08 23:37

Hi Friends,
I have written the following code for knowing whether i have access to a particular directory.

CreateFile( (LPCTSTR)szDir, 0, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
where szDir is "C:\\ProgramData\\NewFolder" . It has all kind of access permission.
This is working fine in all OS,but not in Vista.
Can someone tell me the reason.
I am getting ACCESS_DENIED on Vista.

Please try the same on your machine and you will also see same behavior.

Thanks in advance.

Appu..
"Never explain yourself to anyone.
Because the person who likes you does n't need it.
And the person who dislikes you won't believe it."

Re: CreateFile OPEN_EXISTING problem in Vista

SandipG 6-Aug-08 0:03