C / C++ / MFC

Re: Can one tell me how to?

24-May-07 0:38

What the meaning of "multithreadingly"?

WhiteSky

David Crow24-May-07 4:05

David Crow

24-May-07 4:05

S.V.RAJKUMAR wrote:
In VB, What is the Method to call this function

"How do I call a function from within VB code?" is a VB question. In any case, you'll need something like:

Private Declare Function Add Lib "mydll" (ByVal x as Integer, ByVal y As Integer) As Integer

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Clearly: Can one tell me how to?

RAJKUMARV31-May-07 1:51

RAJKUMARV

31-May-07 1:51

K I know the method is,
i.e. the syntax i know.

but the calling of dll function should be multithreaded. if i declare a function like,

Private Declare Function Add Lib "mydll" (ByVal x as Integer, ByVal y As Integer) As Integer

Laugh | :laugh:

Here i want to call that function(Add1) more than once.They start calculating the result at same time.and each one produces a different result.

OK.
So How Can I call that function in VB.

OK

I directly ask the Question. Mad | :mad:

How to Invoke Multithreading in VB. That is my first problem?

That must assure that, That threading will not affect the dll function calling that is my secod problem.

. Sigh | :sigh:

Kindly bother my English(Poor).Actually my mother tongue is tamil.I noticed codeproject.com doing a nice job among the coders.Thanks In Advance.

S.V.Rajkumar

Re: Clearly: Can one tell me how to?

David Crow31-May-07 2:38

David Crow

31-May-07 2:38

S.V.RAJKUMAR wrote:
How to Invoke Multithreading in VB.

I guess you would create additional threads via CreateThread().

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Difference between C and C++.

C_Zealot23-May-07 22:55

23-May-07 22:55

Hi all:

In C: when a program terminates correctly, we write
return EXIT_SUCCESS; otherwise
return EXIT_FAILURE;

How about C++, I know in C++ EXIT_SUCCESS and EXIT_FAILURE are not defined. Is there any programming convention I should follow apart from writing plain:

return 0; or
return 1;

Thank you

Christian Graus23-May-07 22:58

Christian Graus

23-May-07 22:58

C_Zealot wrote:
EXIT_SUCCESS

Never seen that before...

I would just return 1 or 0, but you can #define them any way you like.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

C_Zealot23-May-07 23:06

23-May-07 23:06

Thank you

CPallini23-May-07 23:18

CPallini

23-May-07 23:18

Christian Graus wrote:
Never seen that before...

You can see it here http://msdn2.microsoft.com/en-us/library/66ythcwz(VS.71).aspx[^]
Big Grin | :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

how to add dynamically in a combo box?

David Crow24-May-07 3:45

David Crow

24-May-07 3:45

What a program returns (to the calling process) is independent of the language used.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

bigphish23-May-07 22:47

bigphish

23-May-07 22:47

i have two comboboxes.one is fro user and other is for administrator.what i want is when ever administrator adding a user it will come in to user combobox.for each user ther is a corresponding password also..pls help.

Re: how to add dynamically in a combo box?

Naveen23-May-07 22:53

Naveen

23-May-07 22:53

bigphish wrote:
Re: how to add dynamically in a combo box?

CComboBox::AddString()
or
CComboBox::InsertString()

nave

Re: how to add dynamically in a combo box?

Hamid_RT23-May-07 23:17

C++ command in line question

23-May-07 23:17

You can use of CB_ADDSTRING or CB_INSERTSTRING and for MFC m_Combo.AddString("Hello"); or InsertString(-1 for insert string to end of list,"Hello");

WhiteSky

C_Zealot23-May-07 22:46

Re: C++ command in line question

23-May-07 22:46

Hi all:

I am writing a program which accepts two command in parameters, "the program name" and "the file it accesses".

My codes are:

#include <iostream>
#include <fstream>
using namespace std;

int main (int argc, char* argv[])
{

ifstream in(argv[1], ios_base::binary);
if (argc != 2) {
cerr <<"Usage: conc file" <

Naveen23-May-07 22:51

Naveen

23-May-07 22:51

C_Zealot wrote:
It compiles with no errors, but it will crash if argc = 1, e.g. there is no file name given.
Why?

because in that case argv[1] will try to access invalid memory and may cause access violation.

You should put the if (argc != 2) checking above the ifstream in(argv[1], ios_base::binary);

nave

Re: C++ command in line question

C_Zealot23-May-07 22:52

how to change CDialog's background color

23-May-07 22:52

Thank you very much, nave.
I understand it now.
Thank you again.

Peter, Chan23-May-07 22:35

Peter, Chan

23-May-07 22:35

:->I have created a class CSkinDesignerDlg derived from CDialog.As its default background color is too normal,I want to change its color.After having searched on the web,I find a way to change its color.Draw its back color in function "OnPaint()",just like below:
void CSkinDesignerDlg::OnPaint()
{
................
CPaintDC dc(this);
CRect rect;
GetClientRect(rect);
dc.FillSolidRect(rect, RGB(0,0,255));
.................
}

As I will always need to show or hide this Dialog form in my program,there will be a shimmer in my program.Is there anybody know some better way to change the background color.

baerten23-May-07 22:44

baerten

23-May-07 22:44

I made it in this way :

in OnCtlColor( CDC pDC ...)

you replace the core with :

if((nCtlColor == CTLCOLOR_STATIC) || (nCtlColor == CTLCOLOR_DLG) ) {
  pDC->SetBkColor(RGB(255,255,255));
  return (HBRUSH) MyBrush;
}

( HBRUSH hbr = ... rests )

where MyBrush is of Type CBrush and will be initialized via MyBrush.CreateSolidBrush(RGB(255,255,255));

I hope it helps

Peter, Chan24-May-07 0:18

Peter, Chan

24-May-07 0:18

I know "OnCtlColor()" is used to set child control's color.And I have also tried to use it. But it seem doesn't work, still have glimmer.

Now I will have a more detail introduction of my software. It has a main form.In the main form,there are a lot of child forms. There's a tab control in the main form which I could used to choose which child form to display. As I have changed the main form and child form's background color(main form and child form have different color), there will always be a glimmer when I change the child form to display.

Is there anybody can help me solve this problem.
Thanks to all the helper.

Hamid_RT24-May-07 0:51

24-May-07 0:51

Peter, Chan wrote:
it seem doesn't work,

Why it doesnt work how do you use it?

WhiteSky

Peter, Chan24-May-07 21:14

Peter, Chan

24-May-07 21:14

Sorry, I said wrong. It works, but still glimmer.

I have tried "CWnd::OnEraseBkgnd(...)". And only paint the area that I need to redraw. Now it shows well, do not have any glimmer.

Hamid_RT24-May-07 21:40

24-May-07 21:40

Peter, Chan wrote:
Now it shows well, do not have any glimmer

Well it seems that your problem solved.;)

WhiteSky

Hamid_RT23-May-07 23:17