C / C++ / MFC

Re: Multithreading and multiple cores

9-Oct-06 2:25

Hi,

AFAIK, windows system doesn't split cores between different threads, but instead it split cores between processes. In order to assign specific core to a specific thread, you should use SetThreadAffinityMask. Before you set new affinity mask for thread, you should obtain current affinity mask for entire process (GetProcessAffinityMask), and of course, affinity mask of your thread can only be a subset of mask of your process.
In order to specify new affinity mask for your process, use SetProcessAffinityMask.

Before you change anything, try to read multiple MSDN documents about: Multiple Processors, Processes and Threads, etc...

Regards

User 5826199-Oct-06 2:49

User 582619

9-Oct-06 2:49

Thanks for the reply. This seems to confirm my observations. I'll probably try OpenMP hoping they will do the windows specific stuff right.

Modal DialogBox

baerten9-Oct-06 2:03

baerten

9-Oct-06 2:03

I create a simple DialogBox with the "Designer"
Then i create the variables to the components and call the DialogBox like this:

MyDialog* dialog = new MyDialog(NULL);
dialog->DoModal();
delete dialog;

The window opens, but nothing is accessible, even i can't slide the window.
If i switch to another window for example IE, the DialogBox is still there in Top-Position
The Dialog is like frozen

Anyone an idea?

Thanks Smile | :)

Re: Modal DialogBox

_AnsHUMAN_ 9-Oct-06 2:09

_AnsHUMAN_

9-Oct-06 2:09

I don't see anything wrong with your code. Can you just tell or post some code about how are you going with the creation of the dialog and why do you pass NULL in the constructor?

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: Modal DialogBox

baerten9-Oct-06 2:27

baerten

9-Oct-06 2:27

normally i pass "this" in the constructor

I think i'll post my question to the forum of the Toolkit that i use.
It's propably a side effect

Thanks nevertheless

Re: Modal DialogBox

toxcct9-Oct-06 2:24

toxcct

9-Oct-06 2:24

i don't see anything wrong either.

but why are you allocating the dialog on the heap ?
why no just doing this :

MyDialog dialog = MyDialog(NULL);
dialog.DoModal();

BTW, isn't your window "frozen-like" due to a huge process called by OnInitDialog() ?

if you have such treatments to do, you should consider delegate these by worker threads...

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

zipping files in C++

m.dietz9-Oct-06 1:38

m.dietz

9-Oct-06 1:38

Hi,

I don't know if this or a similar question is already asked, the search function only gave a .jar-article, so I try to ask on my own.

In a project I have to compress and copy files to a remote computer which should work without any user interaction, and so I'm now asking for a way to do that.

The whole program should run under Windows XP, which can read ZIPs, but are there system libraries to generate ZIPs, or do I need special programs / libraries to zip them? Can I zip files under C++ or do I have to call standard programs nevertheless?

And regarding the transfer, is there an easy way to initiate a non-interactive ftp-transfer of the zip-file after zipping has finished? Can I use the ftp-Program included in windows giving special command line options or do I need a special ftp-library to transfer that file to the remote server?

I'm using MS Visual C++ 6.0 under Windows XP (SP2 installed), if this info is important...

Thanks in advance for your help
Martin Dietz

Galatei9-Oct-06 1:58

9-Oct-06 1:58

Hi,

I recommend you to look at this: 7-zip

It is 7-zip's LZMA SDK, and I think it should fit your needs.

Best regards

m.dietz9-Oct-06 2:14

m.dietz

9-Oct-06 2:14

Hello Galatei,

The problem with 7-zipped files will be that the partners in Jena need a special program to uncompress the files we are sending to them. This was the main reason why I asked about the ZIP-format as this can be uncompressed by windows alone. I can test if I can make use of the 7-zip libraries and ask Jena if they are willing to install an extra decompression program, but in the meantime I hope someone can help me with the ZIP compression...

Thanks anyway
Martin Dietz

kakan9-Oct-06 2:19

kakan

9-Oct-06 2:19

Have a look at InfoZip. AFAIK, both Winzip and java.util.zip is based on InfoZip
http://www.info-zip.org/[^]

Alcohol. The cause of, and the solution to, all of life's problems - Homer Simpson

jhwurmbach9-Oct-06 2:21

jhwurmbach

9-Oct-06 2:21

m.dietz wrote:
In a project I have to compress and copy files to a remote computer which should work without any user interaction, and so I'm now asking for a way to do that.

I recomend to use zLib.
It is open source, thoroghly tested and known to work very well with almost every Zip-Tool

"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."

-- Caius Petronius, Roman Consul, 66 A.D.

Hamid_RT9-Oct-06 18:58

Hamid_RT

9-Oct-06 18:58

See XZip and XUnzip - Add zip and/or unzip to your app with no extra .lib or .dll[^]maybe its some helpful for you

WhiteSky

HICON problem

HakunaMatada9-Oct-06 1:33

HakunaMatada

9-Oct-06 1:33

I use the following code to draw an icon on the Window.

HICON hIcon = (HICON)::LoadImage(_Module.GetResourceInstance(), MAKEINTRESOURCE(IDI_HELP), IMAGE_ICON, m_nButtonWidth, m_nButtonHeight , LR_DEFAULTCOLOR);
::DrawIconEx(hDC, 2, 2, hIcon, m_nButtonWidth, m_nButtonHeight, 0, NULL, DI_NORMAL);

This draws the icon on the Window. But my problem is that my window has a gradient background and my icon has a white background so when I draw the icon, the square shape of the icon with the white background is visible. I want to make the white portion of the icon transparent so that my Window background is visible. How do I do it?

---

Hakuna-Matada Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
Jig | [Dance]

Hamid_RT9-Oct-06 1:48

Hamid_RT

9-Oct-06 1:48

if you run this code what happens?

<br />
HICON hIcon = LoadIcon(AfxGetApp()->m_hInstance,(LPCTSTR)IDR_MAINFRAME);<br />
::DrawIconEx(GetDC()->m_hDC, 2, 2, hIcon, 32, 32, 0, NULL, DI_NORMAL);<br />
<br />

WhiteSky

HakunaMatada9-Oct-06 1:56

HakunaMatada

9-Oct-06 1:56

No changes. The problem still exists.

---

Hakuna-Matada Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
Jig | [Dance]

Hamid_RT9-Oct-06 2:18

Hamid_RT

9-Oct-06 2:18

oh yes

,I think you cant show icon on windows yes I see your problem but change background of icon to default color

WhiteSky

Galatei9-Oct-06 2:11

passing param to the thread function

9-Oct-06 2:11

Hi,

To simply draw icon with transparent background, you should apply AND mask to icon, where 1's specify transparency. For example: in VisualStudio editor, there's a color in color table, which looks like monitor with greeny background. By using this color, you specify which pixel are supposed to be transparent.

Finally, in DrawIconEx function you should specify DI_NORMAL effect mask to draw icon image as well as its mask.

Hope that helps,

Regards

singersinger9-Oct-06 1:29

singersinger

9-Oct-06 1:29

the problem is that i have a thread function

<br />
UINT threadfun(LPVOID param)<br />
{<br />
CList list = (CList)param;<br />
}<br />

and i want to pass param to this function using AfxBeginThread

<br />
AfxBeginThread(threadfun,(WPARAM)m_List); <br />

where "m_List" is from a type defined variable

<br />
typedef CTypedPtrList<CPtrList , tagPLAYLISTENTRY*> CList;<br />

the compiler generate this error:
1- 'CList' : undeclared identifier
2- syntax error : missing ';' before identifier 'list'
3- 'list' : undeclared identifier

i know he can not see this type "CList" inside the function
but what is the solution of this , and how can i make it work

thnx alot 4 ur time and concern.

Nibu babu thomas9-Oct-06 1:38

Nibu babu thomas

9-Oct-06 1:38

Is this file included...

#include <afxtempl.h>

Nibu thomas
A Developer

Programming tips[^] My site[^]

singersinger9-Oct-06 2:17

singersinger

9-Oct-06 2:17

yes it is included,
but as u know the thread function is not a part of the class so it can't see the headers so it don't know what is CList exactly is

problem right ??
i also tried to make the variable static and access it inside the thread function but it come up with an unresolved external error

F Y I, this time was working perfeclty in a member function of the class
but with the thread function, i don't know the problem

Galatei9-Oct-06 2:44

9-Oct-06 2:44

Hi,

yes it is included,
but as u know the thread function is not a part of the class so it can't see the headers so it don't know what is CList exactly is

Make sure that <afxtempl.h> can be parsed by precompiler when header with your thread function is processed. You can even add #include <afxtempl.h> statement directly before your thread function declaration,
example:

#include <afxtempl.h>
void __stdcall YourThreadFunction(LPVOID param)
{
  CList list = (CList)param;
}

Did you know that your thread function can also be a part of your class?

#include <afxtempl.h>
class tester {
private:
 CList m_list;
public:
 void TestMyThread() {
   CreateThread(...,...,YourThreadFunction,this,...,...)
 };
 static void YourThreadFunction(LPVOID param)
 {
   tester *p = (tester*)param;
   CList list1 = p->m_list;
 };
};

Regards

singersinger9-Oct-06 2:29

singersinger

9-Oct-06 2:29

F Y I, typedef was working perfeclty in a member function of the class
but with the thread function, i don't know the problem

so it is not a problem with "typedef CTypedPtrList CList;"
because it was working before

David Crow9-Oct-06 4:09

David Crow

9-Oct-06 4:09

singersinger wrote:
typedef CTypedPtrList<CPtrList , tagPLAYLISTENTRY*> CList;

CList is the name of an existing class. Choose another name.

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