C / C++ / MFC

Re: boost serialization/deserialization strange problem

1-May-12 0:36

the exception cannot be caught with a try - catch block
i already told you what the exception is

Richard MacCutchan1-May-12 0:42

Re: boost serialization/deserialization strange problem

1-May-12 0:42

How else can you catch it? I would suggest that you try the boost website to see what you need to do.

Binding 100,000 items to a list box can be just silly regardless of what pattern you are following. Jeremy Likness

dliviu1-May-12 0:48

Re: boost serialization/deserialization strange problem

1-May-12 0:48

boost site sucks
they have no forum

Richard MacCutchan1-May-12 1:11

Re: boost serialization/deserialization strange problem

1-May-12 1:11

Did you look here[^]?

Binding 100,000 items to a list box can be just silly regardless of what pattern you are following. Jeremy Likness

dliviu1-May-12 1:19

Re: boost serialization/deserialization strange problem

1-May-12 1:19

ok, thanks

Albert Holguin1-May-12 4:09

Albert Holguin

1-May-12 4:09

dliviu wrote:
for (int i=1; i<=COUNT; i++)

{

person p;

ia>>p;

v.push_back(p);

// cout << p._name<<" " <<p._age<<endl;

}

When you do this... you're loading a stack variable into a dynamic heap object. The stack variable falls out of scope at the end of the execution of each for loop iteration. This isn't necessarily the problem causing the crash you're seeing, but it's definitely a problem.

Correction: vector::push_back() does make a copy and not just keep the pointer.

modified 2-May-12 11:32am.

Re: boost serialization/deserialization strange problem

dliviu1-May-12 20:53

Re: boost serialization/deserialization strange problem

1-May-12 20:53

I don't see any problem here. p is an object which when it is inserted in v it is copied.

Anyway, this is not the problem. Boost library site sucks, and i have no solution to my strange problem. Frown | :(

Albert Holguin2-May-12 5:30

Albert Holguin

2-May-12 5:30

I had to look at the implementation of vector.. you're correct, it is copied. As far as the boost site sucking, well, that's something you have to live with when using third party libraries. You can always make your own serialization class and you won't have support issues (although it'll take you some time to do it).

GetClipBoardOwner with acrobat reader

randydom30-Apr-12 19:35

30-Apr-12 19:35

Hi,Why GetClipBoardOwner always returns 0 ,

When using GetClipBoardOwner with any other MS office for example the result will be the real Clipboard Owner , but when using it with acrobat reader i don't get any result .

Please can some one explains me this ?

many thanks

Richard MacCutchan30-Apr-12 23:03

30-Apr-12 23:03

See the documentation[^] for the valid responses from this function.

Binding 100,000 items to a list box can be just silly regardless of what pattern you are following. Jeremy Likness

randydom1-May-12 1:23

1-May-12 1:23

yes , i know but why just with Acrobat reader i don't get the GetClipBoardOwner ?

Richard MacCutchan1-May-12 1:51

1-May-12 1:51

What does GetLastError() tell you?

Binding 100,000 items to a list box can be just silly regardless of what pattern you are following. Jeremy Likness

randydom1-May-12 1:58

1-May-12 1:58

GetLastError() gives me 0 as result only with acrobat reader

Richard MacCutchan1-May-12 2:05

1-May-12 2:05

Sorry, no idea. If it does not give any useful information one can only guess that Acrobat is doing something different.

Binding 100,000 items to a list box can be just silly regardless of what pattern you are following. Jeremy Likness

randydom1-May-12 2:22

1-May-12 2:22

Yes that's why i opened this thread , this just with acrobat reader ! really strange

I hope someone will help me in this issue

Meauring CPU time of C code in milliseconds

David Crow1-May-12 3:49

David Crow

1-May-12 3:49

randydom wrote:
...but when using it with acrobat reader i don't get any result .

What exactly do you mean by this?

Just because the clipboard contains data does not also mean it is owned.

"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

Ron120230-Apr-12 18:18

Ron1202

30-Apr-12 18:18

Hi,

I have following C code and I am trying to measure time used by CPU.

timespec time1, time2, temp_time;

   clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &time1);
    long cpu_sum = 0;


    for (i = 0; i < nelements; i++) {

     cpu_sum += array[i];

    }
   clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &time2);
   int borrow = 0;
   long n = time2.tv_nsec - time1.tv_nsec;
    if (n < 0) { /* nsec underflow; borrow 1 from seconds */
       n += 1000000000L;
       borrow = 1;
   }
   temp_time.tv_nsec = n;
   temp_time.tv_sec = time2.tv_sec - time1.tv_sec - borrow;
   printf(calculated sum: %d using CPU in %lld.%.9ld seconds \n",taskid, cpu_sum, (long long)temp_time.tv_sec, (long)temp_time.tv_nsec);

Just wondering how can i get time in milliseconds?

Re: Meauring CPU time of C code in milliseconds

Peter_in_278030-Apr-12 18:32

Peter_in_2780

30-Apr-12 18:32

It's pretty simple, really. One second is 1000 milliseconds. One millisecond is a million nanoseconds. So

millisecs = secs * 1000 + nanosecs / 1000000

What's so hard about that, given you already have the seconds and nanos?

Peter

Software rusts. Simon Stephenson, ca 1994.

Re: Meauring CPU time of C code in milliseconds

Ron120230-Apr-12 18:42

Ron1202

30-Apr-12 18:42

Thanks for reply. I am not sure whether my timing calculations mentioned above are correct?

Re: Meauring CPU time of C code in milliseconds

Peter_in_278030-Apr-12 18:51

Peter_in_2780

30-Apr-12 18:51

Looks OK at a quick glance. The only problem I can see immediately is too many parameters for the format string in the printf.

Peter

Software rusts. Simon Stephenson, ca 1994.

c++ win32 CreateThread, Wait, final testing

jkirkerx30-Apr-12 16:54

jkirkerx

30-Apr-12 16:54

Well I figured out how to test my compiled output, and find most of the errors.

This is the heart of most of my program failures, and strange behavior. It has something to do with Threads.

On one example, I have a dialog box, that loads parameters. I then click OK, and run the validator, first creating a thread, and the validator runs in the thread, which produces strange errors, like not connecting to sql server.

If I dump the thread, and just run the code function, it works fine, no problem. So I have to decide whether to dump the threads, or try to fix them.

I've tried WaitForSingleObject, and now the MsgWaitForMultipleObjects. On the latter, it just crashes on check return code, in which I run a MessageBox, and crashes.

I am posting this to see if perhaps it just needs improvement. It crashes on Case 1:, but I'm not sure if it really has a problem there or not. The message is Access violation reading location 0x2102fe2b. I don't have the expertise to proceed with the message.

DWORD dwRet;
do {
dwRet = ::MsgWaitForMultipleObjects( 1, &hThread, FALSE, INFINITE, QS_ALLEVENTS );

if (dwRet != WAIT_OBJECT_0)
			{
     MSG msg;
     while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
     {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
     }
}
} while ((dwRet != WAIT_OBJECT_0) && (dwRet != WAIT_FAILED));

DWORD dwExitCode = 0;		
if ( GetExitCodeThread( hThread, &dwExitCode ) ) {
		
	CloseHandle( hThread );
			
	switch ( dwExitCode ) {
		case 0:
		// Create Project Validate was Successful
		bReturn = TRUE;
		break;

		case -1:
		{
		SetFocus( ddl_ProjectCreate_DatabaseName_Field );
		SendMessage( ddl_ProjectCreate_DatabaseName_Field, CB_SETCURSEL, (WPARAM) 0, (LPARAM) 0 ); 
		}
		break;

		case 1:
		// Project type selection error
		MessageBox( g_hWndMainFrame, TEXT("You must select a project type to create\0"), TEXT("Create Project\0"), MB_OK );
		SetFocus( lv_ProjectCreate_ProjectType );
		break;

Code-o-mat1-May-12 0:29

Code-o-mat

1-May-12 0:29

What does your secondary thread do? Show some code if possible. On a sidenote, you mentioned setting strange errors from the thread like not connecting to sql, do you use COM for this? You might need to initialize COM with CoInitializeEx[^] in every thread that does some COM operations (i remember running into this once), did you do this?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

jkirkerx1-May-12 6:57

jkirkerx

1-May-12 6:57

I wrote a post last week about my program working fine when running in debug F5, but the compiled version has many errors. So I've been running the compiled debug version, and using the just in time feature to locate errors. I fixed most of the errors, but the thread eludes me.

I'm using ODBC to connect to the sql server.

The dialog box runs 1 thread to validate when you press OK, and then the next thread to create the project, in which it copies files to the folder, sets permissions, creates a database and tables, users, permissions, write to the registry, and then opens the project.

The strange behavior on the SQL, is that the first sql function runs correctly, and then the 2nd one won't connect.

This is the sql function

BOOL bResult = FALSE;
	
SQLHENV henv;
SQLHDBC hdbc;
SQLHSTMT hstmt;
SQLRETURN retcode;

SQLWCHAR OutConnStr[1024];
SQLSMALLINT OutConnStrLen;

HWND desktopHandle = GetDesktopWindow();   // desktop's window handle

SQLWCHAR	szDatabaseExist[80];
SQLLEN		cbDatabaseExist = 0;
	
// Allocate environment handle
retcode = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv);

// Set the ODBC version environment attribute
if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {
	retcode = SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER*)SQL_OV_ODBC3, 0); 

	// Allocate connection handle
	if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {
		retcode = SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc); 

		// Set login timeout to 5 seconds
		if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {
				SQLSetConnectAttr(hdbc, SQL_LOGIN_TIMEOUT, (SQLPOINTER)5, 0);

			// Process data
			WCHAR pzSQLDriver[128];
			swprintf_s(pzSQLDriver, 128,
				L"Driver={SQL Server Native Client 10.0}; Server=%s; Database=master; Trusted_Connection=Yes;",
				pzServerName
			);				

			// Intialize Connection
			retcode = SQLDriverConnect( hdbc, desktopHandle, (SQLWCHAR*)pzSQLDriver,
				wcslen(pzSQLDriver), OutConnStr, 1024, &OutConnStrLen, SQL_DRIVER_NOPROMPT );

			// Allocate statement handle
			if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {               
				retcode = SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt); 

				// Process data
				WCHAR pzSQLCommand[512];
				swprintf_s(pzSQLCommand, 512,
					L"SELECT CASE WHEN db_id('%s') IS NOT NULL THEN 'TRUE' ELSE 'FALSE' END",
						pzDatabaseName
				);
				pzSQLCommand[wcslen(pzSQLCommand) + 1] = L'\0';
		
				retcode = SQLExecDirect( hstmt, (SQLWCHAR*)pzSQLCommand, SQL_NTS );				
					
				if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {						
						
					SQLBindCol( hstmt, 1, SQL_C_WCHAR, szDatabaseExist, sizeof(szDatabaseExist), &cbDatabaseExist );

					WCHAR *szResult = new WCHAR[cbDatabaseExist];

					while ((retcode = SQLFetch( hstmt )) != SQL_NO_DATA) {
						 swprintf_s(szResult, cbDatabaseExist, L"%s\n", szDatabaseExist );
						 szResult[wcslen(szResult)+1] = L'\0';
						}

					SQLFreeHandle(SQL_HANDLE_STMT, hstmt);						

					if( wcsncmp( szResult, L"TRUE", wcslen(szResult) ) > 0) {
						bResult = TRUE;
					}
					else {
						bResult = FALSE;
					}
						
				}
				SQLDisconnect(hdbc);
			}
                        SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
         }
    }
	
    SQLFreeHandle(SQL_HANDLE_ENV, henv);
}
   	
return bResult;

And then this a a preview of the contents that the thread runs for validation. If something doesn't jive, then the exitcode is generated, and returned to the thread creator, in which the thread creator generates a messagebox, and alters the dialog box.

    BOOL    bValidate = TRUE;
    BOOL    bResult = FALSE;
    DWORD   dwExitCode  = 0;
    DWORD   dwWebsitePath_Check = 0;
    DWORD   dwProjectName = 0;
    DWORD   dwFolderPath = 0;
    DWORD   dwDomainName = 0;
    DWORD   dwLicenseKey = 0;

    DWORD   dwServerName = 0;
    DWORD   dwDatabaseName = 0;
    DWORD   dwAuthMethod = 0;
    DWORD   dwAccountName = 0;
    DWORD   dwPassword = 0;

    WCHAR   *szValidKey = NULL;
    WCHAR   *szWebsitePath_Check = NULL;

    WCHAR   pzProjectType[ 64 ];
    WCHAR   pzProjectName[ MAX_PATH ];
    WCHAR   pzProjectPath[ MAX_PATH ];
    WCHAR   pzFolderPath[ MAX_PATH ];
    WCHAR   pzDomainName[ 255 ];
    WCHAR   pzLicenseKey[ 255 ];

    WCHAR   pzServerName[80];
    WCHAR   pzDatabaseName[80];
    WCHAR   pzAuthMethod[80];
    WCHAR   pzAccountName[80];
    WCHAR   pzPassword[80];

    PMAIN_RUNPROCESS pzValidate;
    pzValidate = (PMAIN_RUNPROCESS)lpParam;
    HWND cWnd               = pzValidate->m_cWnd;
    HWND hWndDlg            = pzValidate->m_hWndDlg;
    HWND lblStatusMessage   = pzValidate->m_StatusMessage;
    HWND pbProgressBar      = pzValidate->m_ProgressBar;

    PROJECT_TYPE projectType;

    // Load the Registry Class
    CA_Registry caReg;

    /////////////////////////////////////////////////////////////////////////////////////////////
// Project Type Validation

    DWORD   dwProjectType = 0;
    dwProjectType = ListView_GetNextItem( lv_ProjectCreate_ProjectType, -1, LVNI_FOCUSED );
    if ( dwProjectType == -1 ) {
        // No Selection has been made - Handle the Error in the Thread Creator
        return 1;
    }
    else {
        // A Selection has been made
        ListView_GetItemText( lv_ProjectCreate_ProjectType, dwProjectType, 0, pzProjectType, 60 );
        if ( wcsncmp( pzProjectType, L"North American Standard Edition 2012", wcslen( L"North American Standard Edition 2012" ) ) == 0 ) {
            projectType = NASE2012_STANDARD;
        }
    }

// End of Project Type Validation    /////////////////////////////////////////////////////////////////////////////////////////////
// Does the Database Exist
	BOOL bDatabaseExist = FALSE;

	CA_SQLServer_ODBC caODBC;
	bDatabaseExist = caODBC._does_SQLServer_Database_Exist_hWnd( pzServerName, pzDatabaseName );

	if ( bDatabaseExist ) {
		return 13;	
	}

	// End of Database Exist	
	/////////////////////////////////////////////////////////////////////////////////////////////
	// if SQL Authentication, validate the credentials
	BOOL bSQLValidate = FALSE;
		
	if ( !bSQL ) {
		// Validate using Windows Authentication
		bSQLValidate = caODBC._validate_SQLServer_Credentials_WinAuth( pzServerName );
		
		if ( !bSQLValidate ) {
			bValidate = FALSE;
			return 11;
		}

	}
	else {
		// Validate using SQL Authentication
		bSQLValidate = caODBC._validate_SQLServer_Credentials_SQLAuth( pzServerName, pzAccountName, pzPassword );
		
		if ( !bSQLValidate ) {
			bValidate = FALSE;
			return 12;
		}

	}
	
// End of Check Project Name
/////////////////////////////////////////////////////////////////////////////////////////////

     return dwExitCode;

Albert Holguin1-May-12 3:46

Albert Holguin

1-May-12 3:46

jkirkerx wrote:
Access violation reading location 0x2102fe2b

What this is telling you is that you're trying to access memory that has either been deallocated already or it is stack memory that belongs to another thread. What variable is in that address? Where and how was it allocated? That should lead you to the cause of your problem.