C / C++ / MFC Discussion Boards

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Re: Calling conventions

Paul M Watt23-Feb-02 16:50

Paul M Watt

23-Feb-02 16:50

The C calling convention puts the parameters on the stack from right to left, this allows the C calling convention to have an limitless parameter list like in the printf function. The caller pops parameters from the stack.

The pascal calling convention is obsolete in WIN32, but it passes its parameters from left to right.
I am not sure, but I believe that the callee pops parameters from the stack frame.

Re: Calling conventions

Rick York23-Feb-02 17:46

Rick York

23-Feb-02 17:46

The pascal (stdcall) calling convention is not obsolete in Win32. Most of the Win32 API uses it. Is has various macros to describe it such as WINAPI, CALLBACK, APIPRIVATE, PASCAL, and IMAGEAPI. It is used for two reasons : first so that multiple programming languages can be supported and second because M$ claims that it is slightly more efficient. Roll eyes | :rolleyes:

Whatever.

You are right that the callee fixes the stack. This is done by adding the number of bytes that were pushed back to ESP.

BTW: I actually do have something that resembles a life but I have spent lots of time reading .cod listings. Smile | :)

Re: Calling conventions

Nemanja Trifunovic23-Feb-02 17:30

Nemanja Trifunovic

23-Feb-02 17:30

I wrote a little article on calling conventions. However, you won't find anything about Pascal calling convention. It was replaced by stdcall in Win32

I vote pro drink Beer | [beer]

What is the function of "PASCAL" in function declaration?

Maer72730-Aug-01 4:24

Maer727

30-Aug-01 4:24

What is the function of "PASCAL" in function declaration?

Maer

Re: What is the function of

Joaquín M López Muñoz30-Aug-01 5:34

Joaquín M López Muñoz

30-Aug-01 5:34

What's the problem? You already got answered on this yesterday

Re: What is the function of

Maer72730-Aug-01 16:24

Maer727

30-Aug-01 16:24

Sorry, I post a wrong question.

What I want to know is "FAR PASCAL"

Thanks.

Maer

ADO Refresh Method in C++

Bigge30-Aug-01 3:56

Bigge

30-Aug-01 3:56

Hi Im using the Refresh Method With ADO C++(I had to many problems with Createparameter Method)

bstr_t bstr = L"DSN=MEAS2SQL;
pCon->Open(bstr, (BSTR)NULL, (BSTR)NULL, -1);
pCommand->ActiveConnection = pCon ;
pCommand->CommandType = ADODB::adCmdStoredProc
pCommand->CommandText = _bstr_t("URBAN");

"It works with executing a stored procedure without parameters"
But when i inlude parameters with this lines i get the error.

pCommand->Parameters->Refresh();
pCommand->Parameters("@pkMbtID") = '160';

I get the error:
error C2064: term does not evaluate to a function

I spent several hours with this Plezz Help.

PS. They say CreateParametr is Faster then Refresh Method i wonder how much faster?

Re: ADO Refresh Method in C++

CodeGuy30-Aug-01 4:15

CodeGuy

30-Aug-01 4:15

For a working ADO VC++ example, check out my web site:
userpages.umbc.edu/~bcorfm1/software.html

Look for the PhoneList program. Although the main program is in WTL, the ADO stuff is applicable to any framework. It includes usage for passing SQL queries with parameters, running stored queries, using Refresh, etc.

Best regards,

CodeGuy

The WTL newsgroup: 880 members and growing ... http://groups.yahoo.com/group/wtl

Re: ADO Refresh Method in C++

Bigge30-Aug-01 4:39

Bigge

30-Aug-01 4:39

Thanx but i couldn't find anything using the "Refresh Method" or the "CreateParameter Method"

/Bigge

Re: ADO Refresh Method in C++

CodeGuy30-Aug-01 4:52

CodeGuy

30-Aug-01 4:52

I made a mistake: I know you said Refresh, but I was thinking of Update instead. Sorry. :/

Let me see if I can help you though: I think you'll find that if you're trying to pass parameters to the DB, that you'd find it easier to pass the parameters like I'm doing in the code, rather than using CreateParameter. With MS Access, you pass a string "EXECUTE Authors 'Faulkner'" where 'Faulkner' is the query parameter. If you're passing numbers, don't use the single quotes.

For SQL Server, the only change is to use the CALL command instead of EXECUTE. This is documented inside the PhoneList's DBHandler class.

Best regards,

CodeGuy

The WTL newsgroup: 880 members and growing ... http://groups.yahoo.com/group/wtl

Re: ADO Refresh Method in C++

Rashid Thadha30-Aug-01 4:22

Rashid Thadha

30-Aug-01 4:22

here is a example with Create Parameters

_RecordsetPtr pRS ;
_CommandPtr pcmdStoredProc;

try
{
    hr = pcmdStoredProc.CreateInstance(__uuidof(Command));
    if(FAILED(hr))
        _com_issue_error(hr);

    pcmdStoredProc->ActiveConnection = <Your Connection>

    pcmdStoredProc->CommandType = adCmdStoredProc;
    pcmdStoredProc->CommandText = _bstr_t("<Stored Proc Name>");

    _ParameterPtr param;
    _variant_t vtReturnVal(0L);
    _variant_t vtReturnVal2(0L);

    // example of output parameter
    param = pcmdStoredProc->CreateParameter(_T("<Param 1 Name>"),adInteger,adParamOutput,sizeof(long),vtReturnVal);
    pcmdStoredProc->Parameters->Append(param);

    param = pcmdStoredProc->CreateParameter(_T("<Param 2 Name>"),adInteger,adParamOutput,sizeof(long),vtReturnVal2);
    pcmdStoredProc->Parameters->Append(param);

    // example of input parameter
    param = pcmdStoredProc->CreateParameter(_T("<Param 3 Name>"),adInteger,adParamInput,sizeof(long), _variant_t((long)10));
    pcmdStoredProc->Parameters->Append(param);

    param = pcmdStoredProc->CreateParameter(_T("Param 4 Name>"),adInteger,adParamInput,sizeof(long), _variant_t((long)-1));
    pcmdStoredProc->Parameters->Append(param);

    pRS = pcmdStoredProc->Execute(NULL, NULL, adCmdStoredProc);
}
catch(_com_error& e)
{
    CString sBuff = GetErrorDescription(e);
    AfxMessageBox(sBuff);
    return;
}
catch(...)
{
    AfxMessageBox("Unknown Error Occured");
    return;
}

Use DataBase In Dialog base Program

Ghasrfakhri30-Aug-01 3:31

Ghasrfakhri

30-Aug-01 3:31

Hi.
Help me to use database in dialog base program.
Rose | [Rose]

Iman Ghasr-e-fakhri

maneging mouse move

Ghasrfakhri30-Aug-01 3:28

Ghasrfakhri

30-Aug-01 3:28

Hi.
what can I do to maneging mouse move event on buttons.

Iman Ghasr-e-fakhri

Re: maneging mouse move

Christian Graus30-Aug-01 12:26

Christian Graus

30-Aug-01 12:26

What are you asking ? WM_MOUSEMOVE is called when you move the mouse, and WM_LBUTTONDOWN/UP/etc are called when you press a button. To tell if a button is down as the mouse is moved you can use GetAsyncKeyState(VK_LBUTTON). You should call it twice, once to clear the buffer and once to check if it's down now, like so

GetAsyncKeyState(VK_LBUTTON); // may return true because it was down since the last check

if (GetAsyncKeyState(VK_LBUTTON))
// NOW we can do something

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

chenge Edit Box (with CEdit)

Ghasrfakhri30-Aug-01 3:20

Ghasrfakhri

30-Aug-01 3:20

Hi.
What can I do to chenge Edit Box (with CEdit) text color & BackGround color

Iman Ghasr-e-fakhri

CEdit ?

otvac30-Aug-01 3:09

otvac

30-Aug-01 3:09

How can I set a CEdit box up such that the enter key must be pressed before an OnChangeEdit Msg is generated? That is, the user must press enter before the edit box data is processed.

Thanks.

Richard

MFC problem

Ghasrfakhri30-Aug-01 2:27

Ghasrfakhri

30-Aug-01 2:27

Hi My friends.
I want to use MFC Singel Document
to Type Equetio with "Breaking line" or "fraction line"

......2
....5x + 6
z=.--------
.....2y

(I don't know use this words corect or not) like this

I nead draw line and text together.
what can I do to have "Cursor" to type text & able to draw line . Rose | [Rose]

Iman Ghasr-e-fakhri

Re: MFC problem

Christian Graus30-Aug-01 12:27

Christian Graus

30-Aug-01 12:27

Nothing - Windows is a graphical system - you can accept text and draw it into the view, and you can draw a line on the view as well.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

How to create a floating toolbox?

Huong30-Aug-01 2:06

Huong

30-Aug-01 2:06

In MS Word 97, when I drag any toolbar (such as drawing toolbar) and drop it on the Word window, it becomes a window with small title bar, when I click on a button on the toolbar, the cursor on MS Word window still blink and MS Word window is still active. Vice versus, when I type, the toolbar window is still active. I try to create a window like that by the API Fuction CreateWindowEx and set window style as WS_Ex_TOOLWINDOW, and its parent as another window;
However, this window becomes de-active when I click on its parent window. I wish to receive any explaination for this phenomenon. Thank you very much.

HOW DO I DO IT ????

The_Server30-Aug-01 1:55

The_Server

30-Aug-01 1:55

I have a question that's realy bothering me.
when I look at the forums question and answers,
I see that the text is on a blue background and sometimes an example code on an orange background.

How do you do that ????

Name: STR
BTW: for some of you that wished for CodeProject irc server
I create a channle on DalNet called "#CodeProject"

Re: HOW DO I DO IT ????

Malcolm McMahon30-Aug-01 2:07

Malcolm McMahon

30-Aug-01 2:07

This board accepts html tags in your posting. To include blocks of code you can use <PRE> or <CODE>

If I put in

<PRE>
Some text
</PRE>

I get:

Some Text

<CODE> Produces text

<br />
Like<br />
This<br />

(To make actual HTML appear as text you use "<" in place of "<")

Re: HOW DO I DO IT ????

Michael Martin30-Aug-01 2:10

Michael Martin

30-Aug-01 2:10

Sagiv

this is done using the HTML tags <pre> and </pre>. You place them around your code and they keep the formatting exactly as you had it. Start your code immediately after <pre> on the same line or else you will get a blank line above your code. If you want to have a blank line between code you need to have a space on the line.

void main()
{
   return;
}

Michael Martin
Pegasystems Pty Ltd
Australia
martm@pegasystems.com
+61 413-004-018

MSFlexgrid(rowselection)

30-Aug-01 1:26

In properties on my MSFlexGrid I have Selectionmode by row.
But why is not the entire row highlighted when I click in the grid. The first colomn in the row is never highlightened, but the rest is highlightened.

Re: MSFlexgrid(rowselection)

ORi x30-Aug-01 1:42

ORi x

30-Aug-01 1:42

Check that you have the property FocusRect to none, if not, the grid won't highlight the cell with the focus

problem in formview

30-Aug-01 1:20

void CExFormViewView::OnInitialUpdate()
{
CFormView::OnInitialUpdate();

CClientDC dc(this);
CPen pen, *oldpen;
pen.CreatePen(PS_SOLID, 1, RGB(255, 0, 0));
oldpen = dc.SelectObject(&pen);
dc.MoveTo(0, 0);
dc.LineTo(220, 100);
dc.SelectObject(oldpen);

}
The problem is to be not run the code above, at running for the first time.
The program is made to formview-based.
Help !!

Last Visit: 31-Dec-99 18:00 Last Update: 2-Jul-24 19:27

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