Setting Current Directory - C / C++ / MFC Discussion Boards

Re: How can I get and set the keyboard state?

Edwin Geng16-May-02 6:20

16-May-02 6:20

Thank you for your replay.

My scenario is:
When message WM_HOTKEY is received, I repeatedly checks keyboard state until no key is pressed. If my program is in the foreground, GetKeyState() cannot work well. Now I has to create a worker thread to check it.

Now I has another question:
GetKeyState() should return a SHORT value which is a 16-bit integer, and only the low byte is significant. If the specific key is pressed, it returns "FF81" or "FF80". Are you sure the above code segment can work well?

Re: How can I get and set the keyboard state?

C^hris L^osinger16-May-02 6:42

C^hris L^osinger

16-May-02 6:42

sorry, i can't help with your first question.

2nd Q:

from MSDN:

GetKeyState:

Return Values
The return value specifies the status of the specified virtual key, as follows:

* If the high-order bit is 1, the key is down; otherwise, it is up.

* If the low-order bit is 1, the key is toggled. A key, such as the CAPS LOCK key, is toggled if it is turned on. The key is off and untoggled if the low-order bit is 0. A toggle key's indicator light (if any) on the keyboard will be on when the key is toggled, and off when the key is untoggled.

-c

ABSURDITY:
A statement or belief manifestly inconsistent with one's own opinion.

Smaller Animals Software

And now,something completely different

nikoladsp15-May-02 1:26

nikoladsp

15-May-02 1:26

i need to implement some search and filtering capabilites in my application.the problem is that i have to call dialog from my CRecordView class.that's OK but how to give informations for CListCtrl which is on dialog-from CRecordView

Re: And now,something completely different

Nish Nishant15-May-02 1:50

Nish Nishant

15-May-02 1:50

Remember that the list control is not created till the dialog is almost shown on screen. Most people try to access member control variables after they instantiate their dialog wrapper class. I suggest that you pass all the strings to a string array and then populate the list control in the initdialog function of the dialog using those strings in the array.

Regards
Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Wow,it is working!!

nikoladsp19-Jun-02 23:13

nikoladsp

19-Jun-02 23:13

thanks man.i would give almost anythyng to foun out how can You possible know all those things?can You tell me where can i download (for free by all means) material (ebooks,html files,...) about MCSD 70-016 certificate?do You think that i can learn something smart from them?Also i need to ask is there any chance to study online MFC programming (again-for free) and where?code on this site is sometimes just too complex for me and i want to follow some guide to get stuck in with it graduatelly.i want to learn how to develop windows applications with MFC so bad!!! thanks for everything

DeviceIOControl for parallel port

nafiton15-May-02 1:21

nafiton

15-May-02 1:21

Hello

What IOCTL codes are available to access to parallel port from an application?

I am trying to read/write from the parallel port with the file access functions but I must be missing something and it doesn´t work.

I don´t have C++ nor the SDK nor the DDk. I only have access to MSDN online help.

Thanks

Good luck
http://www.geocities.com/nafiton

Re: DeviceIOControl for parallel port

jan larsen15-May-02 3:31

jan larsen

15-May-02 3:31

I remember something about using "COM1" as the path name for CreateFile when wanting to access the serial COM1 port.
I guess you just have to specify the name of the port then.

"It could have been worse, it could have been ME!"

Setting Current Directory

Andy Latham15-May-02 0:40

Andy Latham

15-May-02 0:40

Hi,

im trying to set the current working directory before going in to a file dialog and then reseting it to its original value after the dialog has closed:

TCHAR strCurrentDirectory[MAX_PATH];
GetCurrentDirectory(MAX_PATH, strCurrentDirectory);

CFileDialog fileDlg(TRUE, ".dot;.doc", NULL, OFN_FILEMUSTEXIST | OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT | OFN_NOCHANGEDIR, "Microsoft Word Templates (*.dot; *.doc)|*.dot;*.doc|HTML Templates (*.htm; *.html)|*.htm; *.html|All files (*.*)|*.*||\0", NULL);

fileDlg.m_ofn.lpstrInitialDir = "c:\\projects\\temp";

if(fileDlg.DoModal() == IDOK)
{
// Do something
}

SetCurrentDirectory(strCurrentDirectory);

But this doesnt work as next time i go in to a different file dialog the current directory is set as c:\projects\temp.

Has anyone had to cope with a similar problem before and if so how did they get around it?

Cheers,

Andy.

Re: Setting Current Directory

Nish Nishant15-May-02 1:12

Nish Nishant

15-May-02 1:12

Since you have used OFN_NOCHANGEDIR, you really don't need to use Get/SetCurrentDirectory at all.

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Re: Setting Current Directory

Prem Kumar15-May-02 2:27

Prem Kumar

15-May-02 2:27

Hi Probably you are using Windows 2000.
In this OS the last opened directories thru the
application is set in the registry and the
File Dialog reads thru that.

Re: Setting Current Directory

Andy Latham15-May-02 2:37

Andy Latham

15-May-02 2:37

hi, yes i am using windows 2000. do you know where the registry entry is stored so that i can modify that myself.

Cheers,

Andy.

Re: Setting Current Directory

Prem Kumar15-May-02 3:41

Prem Kumar

15-May-02 3:41

HKCU\Microsoft\Windows\Currentversion\explorer\comDlg32\OpenSaveMRU
Its got sub keys for well known extensions and generic keys for
those not registered, see if u can crack and let me know if u do.

Modal dialog closing problem

Patrick Riphagen15-May-02 0:21

Patrick Riphagen

15-May-02 0:21

I use a dialog based application with MFC.
The dialog also has a menu attached to it.
I use a view modal dialog boxes for settings and stuff.

Opening is not a problem but when I try to close this modal dialog the complete application closes. This happens when closing with either IDOK of IDCANCEL buttons.
The problem is that this only happens in Release mode. But without throwing an exeption of some kind.
When "debugging" the release version an exeption in msvcrt.dll at address 0x0000005 is thrown. But I have no clue why this happens.

In earlier versions of the program (without menu but with lots of other extra stuff) this problem did not occur.

Anyone got a clue to this problem?
Thanks

Re: Modal dialog closing problem

Nish Nishant15-May-02 0:28

Nish Nishant

15-May-02 0:28

There is an article here by Joe Newcomer where he explains how to debug a release build. I suggest that you read that.

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

How can extract a Return Value from a Stored Procedure with ADO

youssef14-May-02 23:48

youssef

14-May-02 23:48

Hi,

I use a stored procedure for write to a Database.
When I execute the Stored Procedure, this Stored Procedure acknoledge with a int value if all are OK.

I would like to know how can I do for reading this value.
The value must be extract from the "Status".

You find my sample code:

//Initialize the connection with the Database RTLSQL1 ARCHIVES_NUM
//COM initialization
CoInitialize (NULL);
_ConnectionPtr m_pConn2("ADODB.Connection");
_ParameterPtr pParam2,pParam3;

try
{
//Check if I can create a instance for a connection into a db
HRESULT hr = m_pConn2.CreateInstance (__uuidof (Connection));

if (FAILED (hr))
{
// Automat_LOG_WITH_TIME(_T("DB : Can't create intance of Connection"));
}
else
{
// Automat_LOG_WITH_TIME(_T("DB : I can create intance of Connection"));
}

CString strFileName = "JA001206";
//Check if I can Open a session in the RTLSQL1 ARCHIVES_TVI
if (FAILED (m_pConn2->Open("provider=sqloledb.1;database=ARCHIVES_TVI;server=1.1.1.1;uid=Automat;pwd=Automat;network=dbmssocn","","",adConnectUnspecified)))

{
// Automat_LOG_WITH_TIME(_T("DB : Can't open datasource "));
// Automat_Send_SMS(_T("DB : Can't open datasource "),_T(""));

}
else
{
//Automat_LOG_WITH_TIME(_T("DB : I can open datasource "));
CString sT;
sT.Format("%d",1);
_variant_t varLiReturn;
int liReturn = -99;

_CommandPtr pCmd2("ADODB.Command");
pCmd2->ActiveConnection = m_pConn2;
//Store procedure for the DATABASE
pCmd2->CommandText = "StartFileNumV3";

pParam2 = pCmd2->CreateParameter ( _bstr_t ("FileName"), adVarChar,
adParamInput, strFileName.GetLength (), (_bstr_t) strFileName);
pCmd2->Parameters->Append ( pParam2);

pParam2 = pCmd2->CreateParameter ( _bstr_t ("AutomatNr"), adInteger,
adParamInput, sizeof(int), _variant_t (sT));

pCmd2->Parameters->Append ( pParam2);
pParam2 = pCmd2->CreateParameter(_T("Status"),adInteger,adParamOutput,sizeof(int),varLiReturn);
pCmd2->Parameters->Append ( pParam2);

_RecordsetPtr pRecordset;
pRecordset.CreateInstance(__uuidof(Recordset));
pRecordset = pCmd2->Execute(NULL, NULL, adCmdStoredProc);
//******************
//!!!!!!!! I don't know if it is correct to receive the return value
varLiReturn = pCmd2->Parameters->Item[_T("Status")]->Value;

Sleep(100); //ms
//Automat_LOG_WITH_TIME(_T("DB : The Store Procedure have been execute with success (StartFileNum)"));

//Close the DATABASE
if ( (m_pConn2->State & adStateOpen) == adStateOpen)
{
m_pConn2->Close();
// Automat_LOG_WITH_TIME(_T("DB : I can close datasource RTLSQL1 ARCHIVES_TVI"));
}
else
{
// Automat_LOG_WITH_TIME(_T("DB : I can't close datasource RTLSQL1 ARCHIVES_TVI"));
}
}
}
catch ( _com_error &e )
{
_bstr_t bstrSource (e.Source());
_bstr_t bstrDescription (e.Description());
CString sErrorDB;
sErrorDB.Format("DB : ERROR !!!!!\r\nException thrown for classes generated by #import\r\nCode = %08lx\r\nCode meaning = %s\r\nSource = %s\r\nDescription = %s\r\n", e.Error (), e.ErrorMessage (), (LPCTSTR) bstrSource, (LPCTSTR) bstrDescription);
// Automat_LOG_WITH_TIME(sErrorDB);
MessageBox (sErrorDB, bstrDescription,MB_OK);
}
catch (...)
{
TRACE ( "*** Unhandled Exception ***" );
}

Sleep(100); //ms
CoUninitialize();

youssef

Re: How can extract a Return Value from a Stored Procedure with ADO

Jon Hulatt14-May-02 23:54

Jon Hulatt

14-May-02 23:54

I can't be arsed to read your code. But heres a snippet from some of my code that does what you want:

try {
		_CommandPtr pCommand;
		_ParameterPtr pRetVal;

		pCommand.CreateInstance(__uuidof(Command));
		pCommand->ActiveConnection = m_pConn;
		pCommand->CommandText = "p_YourProc";
		pCommand->CommandType = adCmdStoredProc;
	
		// Create and add return value param
		pRetVal = pCommand->CreateParameter ( _bstr_t ("RETURN_VALUE"), adInteger, adParamReturnValue, 0);
		pCommand->Parameters->Append(pRetVal);

		// create and add taskid param
		pCommand->Parameters->Append ( pCommand->CreateParameter( _bstr_t ("YourParamIn"),adInteger,adParamInput,0 ,_variant_t(lTicketId)));
		pCommand->Execute(NULL, NULL, adCmdStoredProc);

                // this is the bit you're interested in
		lSuccess = (DWORD) pRetVal->GetValue();
	} catch (_com_error e)
	{
		//handle error
	}

Signature space for rent. Apply Within.

Re: How can extract a Return Value from a Stored Procedure with ADO

youssef15-May-02 2:52

youssef

15-May-02 2:52

Hi, thank for the answer but I can't receive the return value.

lSuccess is allways null.

best Regards

youssef

Re: How can extract a Return Value from a Stored Procedure with ADO

Jon Hulatt15-May-02 3:08

Jon Hulatt

15-May-02 3:08

paste the source of your stored procedure.

STL is a religeon. Enquiries to Reverend Christian Grauss

Re: How can extract a Return Value from a Stored Procedure with ADO

Carlos Antollini15-May-02 3:27

Carlos Antollini

15-May-02 3:27

Use My class CADODatabase, You have the CADOCommand and CADOParameter Class...

For other side, if you want to return a value by the parameter, you mus tu use the following sintax in the stored prodedure

Create Procedure MyProc 
@Param1 Integer,
@ParamRet varchar(100) output
AS
...
Select @ParamRect = "Hello World"
Go

Regards

Carlos Antollini.
www.wanakostudios.com
Sonork ID 100.10529 cantollini

Re: How can extract a Return Value from a Stored Procedure with ADO

Jon Hulatt15-May-02 5:14

Jon Hulatt

15-May-02 5:14

Carlos Antollini wrote:
Select @ParamRect = "Hello World"

should be :

Select @ParamRect = 'Hello World'

SQL server is picky about that.

But he wanted a procedure's return value, not to return a value. Theres a difference(!)

STL is a religeon. Enquiries to Reverend Christian Grauss

Re: How can extract a Return Value from a Stored Procedure with ADO

Carlos Antollini15-May-02 5:27

Carlos Antollini

15-May-02 5:27

If he wants to get the value returned by the stored procedure must to use the adParamReturnValue value..... Wink | ;)

Check here

Best Regards

Carlos Antollini.
www.wanakostudios.com
Sonork ID 100.10529 cantollini

Re: How can extract a Return Value from a Stored Procedure with ADO

Jon Hulatt15-May-02 5:38

Jon Hulatt

15-May-02 5:38

My original reply shows him how to do just that!!!

STL is a religeon. Enquiries to Reverend Christian Grauss

Re: How can extract a Return Value from a Stored Procedure with ADO

Carlos Antollini15-May-02 5:48

Carlos Antollini

15-May-02 5:48

It's True, You have the reason

Sorry Blush | :O

Carlos Antollini.
www.wanakostudios.com
Sonork ID 100.10529 cantollini

Re: How can extract a Return Value from a Stored Procedure with ADO

Jon Hulatt15-May-02 5:46

Jon Hulatt

15-May-02 5:46

STL is a religeon. Enquiries to Reverend Christian Grauss

Threads and server side applications

unknown soldier14-May-02 23:44

unknown soldier

14-May-02 23:44

Hi!!!

Can anyone tell me the meaning of phrase "thread pool".

Actually i read certain articles on Server based applications at CP. Many people suggest that allocating one thread per user is a bad approach. People suggest that there are two other options one is I/O completion ports and the other is "thread pool"

Here i am unable to understand the meaning of "thread pool". As far as my vocabulary is concerned, the meaning of word pool is "standing water".

Please tell me the meaning of "thread pool"

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