Re: Searching for help on-line - C / C++ / MFC Discussion Boards

David Crow28-Jul-05 5:16

28-Jul-05 5:16

Per MSDN:

A destructor implemented by declaring a base class's destructor with the keyword virtual. A virtual destructor ensures that, when delete is applied to a base class pointer or reference, it calls the destructor implemented in the derived class, if an implementation exists.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: c++

Alexander ^M.,28-Jul-05 9:09

Alexander ^M.,

28-Jul-05 9:09

What complicated descriptions Poke tongue | ;-P

.

If class A is derived from class B, and you create class A, cast it to a B pointer and delete the B pointer.
If there is no virtual destructor, only the B destructor will be called.

Don't try it, just do it! Wink | ;-)

VC Profiler

RChin27-Jul-05 23:58

RChin

27-Jul-05 23:58

Back in the old days when I used to use VS6, there was a profiler extension that allowed us to produce code timing and coverage for our C++ programs. Now I've been told that this feature have been removed for VS7.1 Sigh | :sigh:

What do you guys use (if any) to get similar optimisation reports now in VS7.1? I do not use the .NET framework.

I Dream of Absolute Zero

Re: VC Profiler

Jack Puppy28-Jul-05 0:21

Jack Puppy

28-Jul-05 0:21

DevPartner Profiler Community Edition

Painted on the side of a dog trainer's van: SIT HAPPENS

Re: VC Profiler

RChin28-Jul-05 1:58

RChin

28-Jul-05 1:58

Sweet. I'll test it out on a few of my projects.

I Dream of Absolute Zero

Re: VC Profiler

Giles28-Jul-05 6:36

Giles

28-Jul-05 6:36

Not used it, but I think there is a bit of a profiler beast in VS 2005 for C++. You can probably play with the Beta. By the sounds of things the compiler itself can use the profiler results to add its own extra optimisations to the code based off the results.

Either a case of waiting until November, or using the Beta now.

"Je pense, donc je mange." - Rene Descartes 1689 - Just before his mother put his tea on the table.

Shameless Plug - Distributed Database Transactions in .NET using COM+

Searching for help on-line

onlysaint27-Jul-05 23:54

onlysaint

27-Jul-05 23:54

I use Ado to connect SQL Server,when I deleted a record,the Provider report a Error Message:"Row handle referred to a deleted row or a row marked for deletion".
The following is my sample code:

pRecordset->delete(adAffectCurrent);
pRecordset->Update();
pRecordset->MoveFirst();
i=0;
while(!m_pRecordset->adoEOF)
{
varValue = pRecordset->GetCollect(long(i);
i++;
if (varValue.vt == VT_NULL)
bstrValue = "";
AfxMessageBox(bstrValue);
pRecordset->MoveNext();
}

Re: Searching for help on-line

mark novak28-Jul-05 1:03

mark novak

28-Jul-05 1:03

This could be many things. Some people get it because they lack a primary key. Others because they are using a JOIN in their select and find they must set the UniqueTable and ResyncCommand and call Resync after a method. Others must call Refresh(). Others get it working using the SQL Command equivalents. This is just what I heard from groups.google.com, I don't use ADO.

Problems with Task Scheduler

beedub27-Jul-05 23:21

beedub

27-Jul-05 23:21

I'm writing an application with Visual C++ that needs to use Window's task scheduler to launch another application at some time in the future.

My problem is that whilst I can create a task that is supposed to run in the future, the Next Run Time (when viewed through Control Panel->Scheduled Tasks) is always "Never".

I've found that if I open the task through Control Panel->Scheduled Tasks and then delete the last character of the 'Run' string and enter the character again (just so it flags the file as having changes made) then click OK, the "Next Run Time" field then has the correct date and time.

It seems that although I've been able to create the task as I need it, it needs to be 'enabled' somehow - something that happens when I save from the Windows GUI but not when its done through my code.

I've been using the example code on MSDN as a guide, however I haven't been able to find any differences that could indicate where I'm going wrong.

Does anyone have any ideas as to what I'm doing wrong?

My OS is Windows XP Professional with SP2 if thats significant.

Thanks,
Brian.

Re: Problems with Task Scheduler

mark novak28-Jul-05 0:46

mark novak

28-Jul-05 0:46

Have you taken a look at the MSDN sample?
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample98/html/vcsmptasksched.asp[^]

Re: Problems with Task Scheduler

David Crow28-Jul-05 5:19

David Crow

28-Jul-05 5:19

What does your code look like that creates the task?

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: Problems with Task Scheduler

beedub28-Jul-05 6:17

beedub

28-Jul-05 6:17

I've pasted the contents of the file here. The scheduling code has not been integrated into my app yet - I'm trying to get it to work first.

--------------------------------------------------------------------------------------------------
#include <afx.h>
#include <objbase.h>
#include <initguid.h>
#include <ole2.h>
#include <mstask.h>
#include <msterr.h>
#include <objidl.h>
#include <wchar.h>
#include <stdio.h>
#include "AFXPRIV.H"

int scheduleTask(SYSTEMTIME Time,CString ExeAndPath,CString ArgList,CString name);
int CreateTrigger(CString name, SYSTEMTIME Time);

int main(int argc, char **argv)
{
USES_CONVERSION;
SYSTEMTIME Time;

Time.wYear = 2005;
Time.wMonth = 7;
Time.wDayOfWeek = 2;
Time.wDay= 27;
Time.wHour= 18;
Time.wMinute= 0;
Time.wSecond= 0;
Time.wMilliseconds=0;

CString ExeAndPath = "C:\\Program Files\\Exterity";
CString ArgList = "\"ExterityLimitedRecord.exe\" -a 239.192.64.105 -p 49408 -t 120 -d C:\\temp\\ScheduledRecord1.mpg";

CString name = "Scheduled Record1";

int result = scheduleTask(Time,ExeAndPath,ArgList,name);
return result;
}

int scheduleTask(SYSTEMTIME Time,CString ExeAndPath,CString ArgList,CString name)
{
HRESULT hr = S_OK;
ITaskScheduler *pITS;
USES_CONVERSION;

/////////////////////////////////////////////////////////////////
// Call CoInitialize to initialize the COM library and then
// CoCreateInstance to get the Task Scheduler object.
/////////////////////////////////////////////////////////////////
hr = CoInitialize(NULL);
if (SUCCEEDED(hr))
{
hr = CoCreateInstance(CLSID_CTaskScheduler,
NULL,
CLSCTX_INPROC_SERVER,
IID_ITaskScheduler,
(void **) &pITS);
if (FAILED(hr))
{
CoUninitialize();
return 1;
}
}
else
{
return 1;
}

/////////////////////////////////////////////////////////////////
// Call ITaskScheduler::NewWorkItem to create new task.
/////////////////////////////////////////////////////////////////

ITask *pITask;
IPersistFile *pIPersistFile;
LPCWSTR pwszAccountName = L"";// run as local account
LPCWSTR pwszPassword = NULL;// run as local account

hr = pITS->NewWorkItem(A2CW(name),//pwszTaskName, // Name of task
CLSID_CTask, // Class identifier
IID_ITask, // Interface identifier
(IUnknown**)&pITask); // Address of task interface

pITS->Release(); // Release object
if (FAILED(hr))
{
CoUninitialize();
fprintf(stderr, "Failed calling NewWorkItem, error = 0x%x\n",hr);
return 1;
}

hr = pITask->SetWorkingDirectory(A2CW(ExeAndPath));

if(FAILED(hr)){
CoUninitialize();
fprintf(stderr, "Failed setting Working directory, error = 0x%x\n",hr);
return 1;
}

hr = pITask->SetParameters(A2CW(ArgList));
if(FAILED(hr)){
CoUninitialize();
fprintf(stderr, "Failed setting Parameters, error = 0x%x\n",hr);
return 1;
}

pITask->SetFlags(TASK_FLAG_DELETE_WHEN_DONE);

//run as local acocunt
hr = pITask->SetAccountInformation(pwszAccountName,pwszPassword);
if(FAILED(hr)){
CoUninitialize();
fprintf(stderr, "Failed setting Account Information, error = 0x%x\n",hr);
return 1;
}
/////////////////////////////////////////////////////////////////
// Call IUnknown::QueryInterface to get a pointer to
// IPersistFile and IPersistFile::Save to save
// the new task to disk.
/////////////////////////////////////////////////////////////////

hr = pITask->QueryInterface(IID_IPersistFile,
(void **)&pIPersistFile);

pITask->Release();
if (FAILED(hr))
{
CoUninitialize();
fprintf(stderr, "Failed calling QueryInterface, error = 0x%x\n",hr);
return 1;
}

hr = pIPersistFile->Save(NULL,
TRUE);
pIPersistFile->Release();
if (FAILED(hr))
{
CoUninitialize();
fprintf(stderr, "Failed calling Save, error = 0x%x\n",hr);
return 1;
}

printf("Created task.\n");

hr =CreateTrigger(name,Time);
return 0;
}

int CreateTrigger(CString name, SYSTEMTIME Time)
{
HRESULT hr = S_OK;
ITaskScheduler *pITS;
USES_CONVERSION;
/////////////////////////////////////////////////////////////////
// Call CoInitialize to initialize the COM library and then
// CoCreateInstance to get the Task Scheduler object.
/////////////////////////////////////////////////////////////////
hr = CoInitialize(NULL);
if (SUCCEEDED(hr))
{
hr = CoCreateInstance(CLSID_CTaskScheduler,
NULL,
CLSCTX_INPROC_SERVER,
IID_ITaskScheduler,
(void **) &pITS);
if (FAILED(hr))
{
CoUninitialize();
return 1;
}
}
else
{
return 1;
}

///////////////////////////////////////////////////////////////////
// Call ITaskScheduler::Activate to get the Task object.
///////////////////////////////////////////////////////////////////

ITask *pITask;

hr = pITS->Activate(A2CW(name),//pwszTaskName,
IID_ITask,
(IUnknown**) &pITask);
if (FAILED(hr))
{
wprintf(L"Failed calling ITaskScheduler::Activate: ");
wprintf(L"error = 0x%x\n",hr);
CoUninitialize();
return 1;
}
pITS->Release();

ITaskTrigger *pITaskTrigger;
WORD piNewTrigger;
hr = pITask->CreateTrigger(&piNewTrigger,
&pITaskTrigger);
if (FAILED(hr))
{
wprintf(L"Failed calling ITask::CreatTrigger: ");
wprintf(L"error = 0x%x\n",hr);
CoUninitialize();
return 1;
}
//////////////////////////////////////////////////////
// Define TASK_TRIGGER structure. Note that wBeginDay,
// wBeginMonth, and wBeginYear must be set to a valid
// day, month, and year respectively.
//////////////////////////////////////////////////////

TASK_TRIGGER pTrigger;
ZeroMemory(&pTrigger, sizeof (TASK_TRIGGER));

// Add code to set trigger structure?
pTrigger.wBeginDay =Time.wDay; // Required
pTrigger.wBeginMonth =Time.wMonth; // Required
pTrigger.wBeginYear =Time.wYear; // Required
pTrigger.cbTriggerSize = sizeof (TASK_TRIGGER);
pTrigger.wStartHour = Time.wHour;
pTrigger.TriggerType = TASK_TIME_TRIGGER_ONCE;
pTrigger.Type.Daily.DaysInterval = 1;

///////////////////////////////////////////////////////////////////
// Call ITaskTrigger::SetTrigger to set trigger criteria.
///////////////////////////////////////////////////////////////////

hr = pITaskTrigger->SetTrigger (&pTrigger);
if (FAILED(hr))
{
wprintf(L"Failed calling ITaskTrigger::SetTrigger: ");
wprintf(L"error = 0x%x\n",hr);
CoUninitialize();
return 1;
}

///////////////////////////////////////////////////////////////////
// Call IPersistFile::Save to save trigger to disk.
///////////////////////////////////////////////////////////////////

IPersistFile *pIPersistFile;
hr = pITask->QueryInterface(IID_IPersistFile,
(void **)&pIPersistFile);
hr = pIPersistFile->Save(NULL,
TRUE);

wprintf(L"The trigger was created and IPersistFile::Save was \n");
wprintf(L"called to save the new trigger to disk.\n");

///////////////////////////////////////////////////////////////////
// Release resources.
///////////////////////////////////////////////////////////////////

pITask->Release();
pITaskTrigger->Release();
pIPersistFile->Release();

return 0;
} // End Create Trigger

Thanks,
Brian

Re: Problems with Task Scheduler

David Crow28-Jul-05 8:57

David Crow

28-Jul-05 8:57

At the end of CreateTrigger() right before Release() is called, have you checked with IScheduledWorkItem::GetNextRunTime() to see if a next-run time actually exists? It may just be a problem with the Scheduled Task applet not displaying it correctly.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

How to make a splitted frame?

Olgun27-Jul-05 23:01

Olgun

27-Jul-05 23:01

I am new to mfc. I have created a dialog "mydlg" and want to display it in a Splitted main Frame. How can I create a simple splitted frame?

Thanks in advance

Olgun

Re: How to make a splitted frame?

Mohammed F. Salem28-Jul-05 0:30

Mohammed F. Salem

28-Jul-05 0:30

How can I create a simple splitted frame?

if u want to create splitted frame
at the beginning of MFC application wizard select SDI option

and after that at step 5 of 6
select the Base class CView

and create virtual function OnCreateClient() for the class CMainFrame

and intilalize boolean variable at the class and give it false value at hte constructor
after u created it delete all the code of OnCreateClient() function and write this instead

if ( !m_mainSplitter.CreateStatic( this, 1, 2 ) )<br />
{<br />
	MessageBox( "Error setting up m_mainSplitter", "ERROR", MB_OK | MB_ICONERROR );<br />
	return false;<br />
}<br />
// The views for each pane must be created <br />
if ( !m_mainSplitter.CreateView( 0,0,RUNTIME_CLASS(CLeftView),CSize(255, 0), pContext ) )<br />
{<br />
        //CLeftView ur leftview class<br />
	MessageBox( "Error setting up splitter view", "ERROR", MB_OK | MB_ICONERROR );<br />
	return false;<br />
}<br />
if ( !m_mainSplitter.CreateView( 0, 1, RUNTIME_CLASS(CRightView),CSize(0, 0),Context ) )<br />
{<br />
        //CRightViewur rightview class<br />
	MessageBox( "Error setting up splitter view", "ERROR", MB_OK | MB_ICONERROR );<br />
	return false;<br />
}<br />
//change flag to show splitter created<br />
m_bInitSplitter = true;<br />
//return TRUE instead of the parent method since that would<br />
//not show our window<br />
       return true;

MFC programmer

Re: How to make a splitted frame?

David Crow28-Jul-05 5:24

David Crow

28-Jul-05 5:24

m_fuad67 wrote:
if ( !m_mainSplitter.CreateStatic( this, 1, 2 ) )

You should probably indicate that m_mainSplitter is a CSplitterWnd object.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: How to make a splitted frame?

Olgun28-Jul-05 23:23

Olgun

28-Jul-05 23:23

Thanks a lot for your reply.

Olgun

How do i convert CString from MFC application to String in Win32 application

santoshskulkarni27-Jul-05 20:46

santoshskulkarni

27-Jul-05 20:46

hello all ,
i have some code in MFC which i have to write it in win 32 but i couldnt find a rightway can anybody help me regarding this. My code goes like this.

in MFC code is:
typedef unsigned short mtsChar_T;
.
.
mtsChar_T* pResultText;
.
.
CString res;
for(i=0; i< 100; i++)
{
if((pResultText + i)=='\0')
break;
res =res +(pResultText+i);
}
AfxMessageBox(res);

Now i have to write it in win 32sdk application , iahve tried the same code by just replacing Cstring wirh string but it doesnt complile .plz help me abt this Frown | :(

Santosh

Re: How do i convert CString from MFC application to String in Win32 application

Bob Stanneveld27-Jul-05 21:06

Bob Stanneveld

27-Jul-05 21:06

Hello,

Maybe a std::string[^] or a std::stringstream[^] can be of some help..

If not, you have to use strings of TCHARs (see the tchar.h header). You also have to use a lot of C string functions.

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Re: How do i convert CString from MFC application to String in Win32 application

santoshskulkarni27-Jul-05 22:14

santoshskulkarni

27-Jul-05 22:14

Can you please elaborate more on this Bob?

Re: How do i convert CString from MFC application to String in Win32 application

Bob Stanneveld27-Jul-05 22:55

Bob Stanneveld

27-Jul-05 22:55

Hello,

See the following code examples and see the difference between the CRT and the STL:

// example using the STL and streams
double dValue = 99.9;
std::stringstream sstr;
sstr << _T("This is some string with a double: ") << dValue << std::endl;

// example using the CTR
double dValue = 99.9;
TCHAR szBuf[1024] = {0};
_sntprintf(szBuf, 1023, _T("This is some string with a double: %f", dValue);

Some differences of the STL compared to the CRT are:
<list>

You don't have to use buffer magic, the STL does it for you

You don't have to use range checking as much as with the CRT

The syntax looks more clean
D'Oh! | :doh:

I remember now a nice CString replacement written by another CPian: CStdString[^]. You can use this class instead of the MFC CString without too much hassle. Big Grin | :-D

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Re: How do i convert CString from MFC application to String in Win32 application

santoshskulkarni28-Jul-05 0:58

santoshskulkarni

28-Jul-05 0:58

Thanks Bob, it will really help me .

Re: How do i convert CString from MFC application to String in Win32 application

John R. Shaw28-Jul-05 5:30

John R. Shaw

28-Jul-05 5:30

Note: The define UNICODE has no effect on standared streams or strings. Therefore, the _T() does not realy apply unless you do one of the following:

---------------------------------------------
#ifdef UNICODE
std::wstringstream sstr;sstr << _T("This is some string with a double: ") << dValue << std::endl;
#else
std::stringstream sstr;sstr << _T("This is some string with a double: ") << dValue << std::endl;
#endif
---------------------------------------------
// OR
#ifdef UNICODE
std::wstringstream sstr;sstr << L"This is some string with a double: " << dValue << std::endl;
#else
std::stringstream sstr;sstr << "This is some string with a double: " << dValue << std::endl;
#endif
---------------------------------------------
// OR much simpler
std::basic_stringstream<TCHAR> sstr;sstr << _T("This is some string with a double: ") << dValue << std::endl;
---------------------------------------------

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

CView and Dialog

Mohammed F. Salem27-Jul-05 20:35

Mohammed F. Salem

27-Jul-05 20:35

Hi I have a program with MFC that include Two panes
left pane for TreView and Right pane for List View
and there is icon at toolbar show me Dialog

after inserting data at dialog the TreeView must do refresh for data that came from database

how could i exchange data between the TreeView and Dialog(not FormView)??

MFC programmer

Re: CView and Dialog

Cool Ju27-Jul-05 21:18

Cool Ju

27-Jul-05 21:18

if u r reading the database in treeview, U can send a user defined message to the treeview from dialog to refresh it by reading the updated database .

Cool Ju Cool | :cool:

Dont forget to vote Smile | :)

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