C / C++ / MFC Discussion Boards

Re: pointer-to-array

korte2521-Mar-09 7:44

korte25

21-Mar-09 7:44

thanks

Re: pointer-to-array

CPallini21-Mar-09 7:48

CPallini

21-Mar-09 7:48

You are welcome.
Smile | :)

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-- Alfonso the Wise, 13th Century King of Castile.

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[My articles]

Re: pointer-to-array

Stuart Dootson21-Mar-09 12:29

Stuart Dootson

21-Mar-09 12:29

So....you have:

CBase* pArray[] = { whatever... };
CBase* pItem = address_of_some_item_in_the_array;

?

In that case:

const size_t index = pItem - pArray;

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: pointer-to-array

korte2522-Mar-09 2:30

korte25

22-Mar-09 2:30

thx

CreateDirectoryW()

p_196021-Mar-09 3:47

p_1960

21-Mar-09 3:47

Hi,
May i know how to check if a folder or file exists and if not create a folder....

im using ...
CString csPath1="C:\\Temp\\myfolder";

if(_access (csPath1+_T("\\Test"), 0)==-1);
::CreateDirectoryW(csPath1+L"\\Test",NULL);

and im getting the below error....
'_access' :cannot convert parameter 1 from 'ATL::CStringT<BaseType,StringTraits>' to 'const char *'...

Please help me......(myproject is in unicode)

Re: CreateDirectoryW()

«_Superman_»21-Mar-09 4:05

«_Superman_»

21-Mar-09 4:05

Why do you need to check first?
CreateDirectory will return ERROR_ALREADY_EXISTS if the directory already exists.

«_Superman_»
I love work. It gives me something to do between weekends.

Re: CreateDirectoryW()

p_196021-Mar-09 4:17

p_1960

21-Mar-09 4:17

Thanks for ur help and please let me know how can i check whether a file(not directory) exists....(my project is in unicode)........

Re: CreateDirectoryW()

Rajesh R Subramanian21-Mar-09 4:28

Rajesh R Subramanian

21-Mar-09 4:28

You can use PathFileExists()[^] function (works with both folders and files).

The page contains a sample as well - saves me from typing code. Do remember to include shlwapi.h and link to shlwapi.lib.

It is a crappy thing, but it's life -^ Carlo Pallini

How to use Borland C DLL in C#.NET

dataminers21-Mar-09 3:28

dataminers

21-Mar-09 3:28

How can I use DLL file in C#.NET ? I create dll in Borland C++ Compiler 5.5.1 and using C language.

Following code is not work.

My C Code;
-----------------------------------------------------
//hello.dll
#include <windows.h>

extern "C"
{
void __declspec (dllexport) function1()
{

MessageBox (NULL, "test message","test title",0);
}
}

BOOL WINAPI DllMain (HINSTANCE, DWORD, LPVOID)
{
return TRUE;
}

My C# Code;
-----------------------------------------------------

[DllImport("C:\hello.dll")]
public static extern void function1();

private void button1_Click(object sender, EventArgs e)
{
function1();
}

Re: How to use Borland C DLL in C#.NET

dataminers21-Mar-09 3:49

dataminers

21-Mar-09 3:49

Ok, I try this; But I get this error: Entry Point Not Found

C DLL CODE
-----------------------------------------------

#include <windows.h>

BOOL __stdcall DllMain(HINSTANCE hInst, DWORD dwReason, LPVOID lpReserved) {
return TRUE;
}

__declspec(dllexport) void __stdcall Message(char* p_szMessage) {
MessageBox(NULL, p_szMessage, "Message from DLL", MB_OK);
}

C# DLL CODE
-----------------------------------------------

[DllImport("filename.dll")]
static extern void Message(string msg);

private void button1_Click(object sender, EventArgs e)
{
Message("Hello world");
}

Re: How to use Borland C DLL in C#.NET

CPallini21-Mar-09 4:03

CPallini

21-Mar-09 4:03

What does it mean, specifically, 'it doesn't work' (i.e. more details needed)?

BTW you possibly would get better help at C# forum.

BTW2: I saw you've already cross-posted your question... Roll eyes | :rolleyes:

Re: How to use Borland C DLL in C#.NET

dataminers21-Mar-09 5:04

dataminers

21-Mar-09 5:04

cross-posted is forbidden? Because this question related about between c and c#.

How can I "dumpbin -exports dll" in borland c++ 5.5.1 compiler on command prompt?

Do you have any idea?

sending structure data on tcp socket

jalsa G21-Mar-09 2:55

jalsa G

21-Mar-09 2:55

Hi,

how do we send structure data on tcp socket ?

any code snippets ?

Jalsa

Re: sending structure data on tcp socket

CPallini21-Mar-09 3:27

CPallini

21-Mar-09 3:27

jalsa G wrote:
how do we send structure data on tcp socket ?

Just like any other binary data.
Smile | :)

Re: sending structure data on tcp socket

«_Superman_»21-Mar-09 3:38

«_Superman_»

21-Mar-09 3:38

It doesn't matter what you're sending, just make sure the size of data is mentioned correctly.
You may need to typecast the data as char* 'cause that's what the function accepts.

«_Superman_»
I love work. It gives me something to do between weekends.

Re: sending structure data on tcp socket

CPallini21-Mar-09 4:13

CPallini

21-Mar-09 4:13

«_Superman_» wrote:
It doesn't matter what you're sending

Provided you're not sending pointers... Roll eyes | :rolleyes:

--Carlo the Nitpick.

Re: sending structure data on tcp socket

Rajesh R Subramanian21-Mar-09 4:33

Rajesh R Subramanian

21-Mar-09 4:33

Also, an old Greek mythic legend states that you cannot (and should not) send tomatoes on socket.

It is a crappy thing, but it's life -^ Carlo Pallini

Re: sending structure data on tcp socket

CPallini21-Mar-09 5:11

CPallini

21-Mar-09 5:11

Rajesh R Subramanian wrote:
Also, an old Greek mythic legend states that you cannot (and should not) send tomatoes on socket.

Of course, since old Greeks did not know both of tomatoes and sockets.
Laugh | :laugh:

How to add Message Handler(MESSAGE_MAP) for generic class?

Abhijit D. Babar21-Mar-09 2:31

Abhijit D. Babar

21-Mar-09 2:31

Hello All,

I want to add Message handler for a generic class in Visual Studio 2008(VC++).

I have a generic class suppose CDataDisplay, Which don't having any base class. I want to create message map for this class.

How can i do this? If anyone having idea please help with some code.

Thanks,
Abhijit

Want to give an image on a button

m_mun21-Mar-09 1:47

m_mun

21-Mar-09 1:47

Hi,
How can i give or set a picture above a button. My application is MFC application. Like copy, cut button on toolbar. What will be the image format.

Thanks & Regards
Shaheen

Re: Want to give an image on a button

CPallini21-Mar-09 3:26

CPallini

21-Mar-09 3:26

You may use a CBitmapButton [^].
Smile | :)

2500 item in list control

VCProgrammer21-Mar-09 1:37

VCProgrammer

21-Mar-09 1:37

Hi all,

I have made a dialog based application in vc2008, in that application i have created a list control. In that list control i am displaying file names from a particular folder......

suppose folder contains 2500 files and allfiles are bmp type, i am also displaying system icon(which is picked up from system at runtime only) in front of every file.

Now the problem is as soon as i click on adding file to my list control only border of my list ctrl is displyed and everything becomes white and after some time not responding status is being shown and after some time application crashes. i have monitored its memory usage from task manager it exceeds very fast and its very high...

i am not getting how to resolve it and infact what exactly the problem is...

can anybody help me in this....

Re: 2500 item in list control

Luc Pattyn21-Mar-09 2:05

Luc Pattyn

21-Mar-09 2:05

Hi,

the symptoms you describe typically appear when another thread is accessing some controls that were originally created by the main thread. Only the main thread should ever touch any of the controls,
they are not thread-safe. You probably have to rethink the threading scheme used.

Smile | :)

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Re: 2500 item in list control

Michael Schubert21-Mar-09 2:09

Michael Schubert

21-Mar-09 2:09

You could process messages from time to time in order to keep the UI alive, something like this:

MSG msg;
while (::PeekMessage(&msg, 0, 0, 0, PM_NOREMOVE))
{
    if (!(AfxGetApp()->PumpMessage()))
    {
        ::PostQuitMessage(0);
            break;
    }
}

Don't know why your app is using so much memory, 2500 items isn't that much...

Re: 2500 item in list control

Cedric Moonen21-Mar-09 2:12

Cedric Moonen

21-Mar-09 2:12

Michael Schubert wrote:
Don't know why your app is using so much memory, 2500 items isn't that much...

Except if he is loading 2500 big bmp files Roll eyes | :rolleyes:

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

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