C / C++ / MFC Discussion Boards

kakan14-Sep-05 23:44

14-Sep-05 23:44

Use the Registry (preferred) or a configuration file. You can find lots of articles at CodeProject. Search for the word registry.

Re: Saving configuration option data

Manfred Staiger14-Sep-05 23:46

Manfred Staiger

14-Sep-05 23:46

You can use the windows registry for storing your data. The platform SDK provides a set of functions to access the registry. Search MSDN.

Another way is to store the data in a text file. This is very easy using the MFC class CStdioFile.

MS

Re: Saving configuration option data

karmendra_js15-Sep-05 0:15

karmendra_js

15-Sep-05 0:15

i used the following code but it gives assertion failure why?

CStdioFile f;
char buf[] = "test string";

f.WriteString( buf );

Re: Saving configuration option data

Manfred Staiger15-Sep-05 0:23

Manfred Staiger

15-Sep-05 0:23

You need to open the file before writing to it. Do it this way:

CStdioFile file;
CString lineOfText;

file.Open("C:\\exaplepath\\examplefile.xyz", CFile::modeCreate|CFile::modeReadWrite);

lineOfText="This is the first line";
lineOfText+="\r\n";

file.Writestring(lineOfText);

lineOfText="This is the second line";
lineOfText+="\r\n";

file.Writestring(lineOfText);

file.Close();

MS

Re: Saving configuration option data

ThatsAlok14-Sep-05 23:53

ThatsAlok

14-Sep-05 23:53

karmendra_js wrote:
Now how and where can i save the configuration data. and how to retrive last saved configuration

There are many option for saving and reteriving the configurations->

[INI]
http://www.codeproject.com/cpp/cinifile.asp[^]

[Registry]
look for CRegKey in you local copy of MSDN

[Serialize]
http://www.codeproject.com/cpp/serialization_primer1.asp[^]

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: Saving configuration option data

karmendra_js15-Sep-05 0:25

karmendra_js

15-Sep-05 0:25

http://www.codeproject.com/cpp/cinifile.asp[^]

this link doesn't work.

and can i get an example code how to use CRegKey class for storing and retriving data.

I have around 11 feilds and i want to save them all.

thanks.

Re: Saving configuration option data

ThatsAlok15-Sep-05 0:57

ThatsAlok

15-Sep-05 0:57

karmendra_js wrote:
http://www.codeproject.com/cpp/cinifile.asp

just try http://www.codeproject.com/cpp/cinifile.asp

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: Saving configuration option data

David Crow15-Sep-05 7:41

David Crow

15-Sep-05 7:41

karmendra_js wrote:
http://www.codeproject.com/cpp/cinifile.asp

this link doesn't work.

Did you not notice the extra stuff in the URL? Try it again but remove the extraneous characters.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: Saving configuration option data

Ashok Dhamija15-Sep-05 1:28

Ashok Dhamija

15-Sep-05 1:28

You can consider using the Registry to save your configuration data. Proceed as under (with MFC):

1. Use functions such as SetRegistryKey, WriteProfileString (for a string), WriteProfileInt (for int), GetProfileString, GetProfileInt, etc., of the application class for setting and accessing values from the Registry.

2. You can consider the Constructor or InitDialog functions wherein the stored values can be retrieved from Registry and displayed in the Configuration dialogbox.

3. Use OnOK (or whatever other button-event-handlers) to save the changed configuation data to registry.

4. Use these stored values appropriately in the code to change your program response. For example, use PreCreateWindow function of the mainframe class to change the position or size of main window using stored configuration data.

Regards,
Ashok Dhamija
_____________________________
Padam Technologies

Re: Saving configuration option data

Achim Klein15-Sep-05 8:52

Achim Klein

15-Sep-05 8:52

Hi,

honestly I don't like Bill's registry very much...
If I need to store any configuration data this is my preferred way.

Regards
Achikm Klein

We can do no great things, only small things with great love. - Mother Theresa

Re: Saving configuration option data

ThatsAlok15-Sep-05 18:06

ThatsAlok

15-Sep-05 18:06

Achim Klein wrote:
honestly I don't like Bill's registry very much...

Yeap Nice, But still you using Bill's Window for storing the data ?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

UniCode To Ansi Conversion problem

fjlv200514-Sep-05 23:24

fjlv2005

14-Sep-05 23:24

I have a problem with conversion, when i ran the code below, it gives me the error :
Error : ERROR_INVALID_PARAMETER (refer to trace code below).. Whats wrong with my code?

By the way Im using Embedded Visual 3, where the default setting of my Project is Unicode...
I have my own CSoString which is the same with CString but in plain C format ANSI and have some additional features in it. I want to convert first from unicode to ansi so that the converted ansi will be passed to CSoString like for ex.
CSoString mystring;
mystring.Copy(char* here); // where the char* is the converted Unicode to ANSI.

but before i copy it, i have to fix the problem with conversion....

Pls. see code below..

Thanks and More pOwer.

------------------------------------------- Code ----------------------------------------

CString m_wordSearchText; // this variable is a cstring of edit box.
LPSTR hold=0;
LPSTR hold2=0;
int len=WideCharToMultiByte(CP_ACP,0,(LPCWSTR)m_wordSearchText,-1,hold,0,NULL,NULL);
if (len==0)
{
DWORD lerror=GetLastError();
switch(lerror)
{
case ERROR_INSUFFICIENT_BUFFER :
{
TRACE(_T("ErrorLen : ERROR_INSUFFICIENT_BUFFER\n")); break;
}
case ERROR_INVALID_FLAGS :
{
TRACE(_T("ErrorLen : ERROR_INVALID_FLAGS\n")); break;
}
case ERROR_INVALID_PARAMETER :
{
TRACE(_T("ErrorLen : ERROR_INVALID_PARAMETER\n")); break;
}
}
}
else
{
WideCharToMultiByte(CP_ACP,0,(LPCWSTR)m_wordSearchText,len,hold,len,NULL,NULL);
DWORD lerror=GetLastError();
switch(lerror)
{
case ERROR_INSUFFICIENT_BUFFER :
{
TRACE(_T("Error : ERROR_INSUFFICIENT_BUFFER\n"));
break;
}
case ERROR_INVALID_FLAGS :
{
TRACE(_T("Error : ERROR_INVALID_FLAGS\n"));
break;
}
case ERROR_INVALID_PARAMETER :
{
TRACE(_T("Error : ERROR_INVALID_PARAMETER\n"));
break;
}
}
}

TRACE2("UniCodeWord=%s ConvertedWord=%s\n",m_wordSearchText,hold);

Re: UniCode To Ansi Conversion problem

Jack Puppy15-Sep-05 1:11

Jack Puppy

15-Sep-05 1:11

You didn't initialize the Ansi string, it points to NULL.

Just prior to the second WideChar call, insert the code:

<br />
hold = new char [len + 1];<br />
WideCharToMultiByte(CP_ACP,0,(LPCWSTR)m_wordSearchText,len,hold,len,NULL,NULL);<br />
hold[len] = '\0';<br />
<br />
...<br />
<br />
delete [] hold;<br />
<br />

I usually use a CStringA object instead of allocating with new, not sure if it's part of Embedded Visual 3.

He is smart. He will make our Windows go.

-- modified at 7:11 Thursday 15th September, 2005

Re: UniCode To Ansi Conversion problem

fjlv200515-Sep-05 15:58

fjlv2005

15-Sep-05 15:58

Hi,

Thanks for the code. It works.

More power to you..

warning for compiler option /GX

logicaldna14-Sep-05 23:12

logicaldna

14-Sep-05 23:12

In My compiler option i gave /gx option but still i get warning

warning C4530: C++ exception handler used, but unwind semantics are not enabled. Specify -GX

No error
But
when compiled in release MinDependency
I am getting Compiler error
error LNK2005: __fltused already defined in StdAfx.obj

plz help its urgent

Sagar
Love Is photogenic,It require a dark to develope

GPRS

_tasleem14-Sep-05 23:11

_tasleem

14-Sep-05 23:11

hi i want to know how Gprs works. it work through the ports or any device is required. what i want to do is transfer file from the computer to PDA rhrough the GPRS any body can guide me what is requirement of gprs.

ddd

Re: GPRS

ThatsAlok15-Sep-05 18:09

ThatsAlok

15-Sep-05 18:09

tasleem143 wrote:
rhrough the GPRS any body can guide me what is requirement of gprs.

This link might Help:-
GPRS INTRODUCTION[^]

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Huffman Encoding

edurach14-Sep-05 22:29

edurach

14-Sep-05 22:29

Hi! i'm a computer science student and have been given an assignment to implement Huffman Encoding and Decoding.
I understand the principles in Huffman Encoding and decoding but i don't know how to implement it. could anyone help me to write the source code with explanations if possible

thx
Just email me

Re: Huffman Encoding

Rage14-Sep-05 22:41

Rage

14-Sep-05 22:41

Try and search Code Project for Huffman, and you will get some examples.

Fort instance :

Here the article with source code[^]

~RaGE();

Simulate post at webpage

Daniel Strigl14-Sep-05 22:10

Daniel Strigl

14-Sep-05 22:10

I want to simulate an input and post into a web page and than download the web page that is opened after the correct input! The web page exists of an user input form with userid and password, after input the correct data and pressing the submit button another web page will be opened.

I have tried to download the web page with the following code (I am using the CAmHttpSocket class at http://www.codeproject.com/internet/amhttputils.asp):

int _tmain(int argc, _TCHAR* argv[])
{
CAmHttpSocket http;

char* p = "userid=xxx&pwd=xxx";

char* s = http.GetPage(
_T("https://orawww.uibk.ac.at/public_prod/owa/pk205.frame_lv_termine_lzk?termin_id_in=3678"),
true, p, strlen(p));

int i = http.GetPageStatusCode();

printf("%s\n", s);

printf("%d\n", i);

return 0;
}

My problem is that I don't know how to simulate the input and pressing the submit button!

How can I pass the userid and the possword?

Regards,
Daniel.
--
FIND A JOB YOU LOVE, AND YOU'LL NEVER HAVE TO WORK A DAY OF YOUR LIFE. Wink | ;)

-- modified at 4:46 Thursday 15th September, 2005

Renaming Tree Nodes

laiju14-Sep-05 20:41

laiju

14-Sep-05 20:41

I have used PreTranslate message to capture the renaming of Tree Nodes.
I am capturing the VK_RETURN key to complete the renaming of tree nodes.
But the tree control can also complete the rename operation by clicking the mouse anywhere on the tree control after typing the new string for the folder.
I dont want the rename to take place by mouse click. I know how to revert the old string of the tree node .But I dont know what event completed the rename operation .Like if i can differentiate the end of rename operation by mouse or by keyboard i can block the mouse rename operation.
I tried to do the following filter .

void CTreeCtrlBar::OnTvnEndlabeleditTree1(NMHDR *pNMHDR, LRESULT *pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
if (pNMTreeView->action == TVC_BYKEYBOARD)
AfxMessageBox("End by ENTER Key");
else if (pNMTreeView->action == TVC_BYMOUSE)
AfxMessageBox("End by mouse click");

**************************************************************************
But always the condition pNMTreeView->action == TVC_BYMOUSE gets satisfied
even when I pressed ENTER key to complete the rename operation.
Any suggestions please.

laiju

What is the Anotomy of Encarta?

shoaibnawaz14-Sep-05 20:30

shoaibnawaz

14-Sep-05 20:30

I am beginer for VC and MFC. I want to develop an Encyclopedia type Application to combine huge amount of Literature of URDU. Encarta 2005 attracted me due to its intractiivity. What are the technologies should I foucs to develop encarta like applicaiton. What is the possible structure of Encarta. How files and articles are stored. How Searches are made.

Shoaib Nawaz

Re: What is the Anotomy of Encarta?

vikas amin14-Sep-05 21:36

vikas amin

14-Sep-05 21:36

Its a big project try to gain some grip on VC++
and then give shape to the project that what i
can tell u .;)

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

How to print the page for right of screen !!!

ebinaini14-Sep-05 19:51

ebinaini

14-Sep-05 19:51

hi~~
now i am working on a project encounter a problem ,i want print the right of screen
but everytimes print start lift of screen how can i print start from right of screen?????????????????????????????????????? Confused | :confused:

nothing

How to wait for thread & if no response within time abort it

karmendra_js14-Sep-05 19:32

karmendra_js

14-Sep-05 19:32

Hello,

I am new to VC++ and this forum too. i want to know how can I perform following task in VC++ 6 using MFC.

I am writing host application and device drivers for a USB HID Device. I have a situation here, Whenever i call writreport function to write data to the USB HID device it has to Acknowledge. But buy any chance if device do not send back a response, the host software hangs( doesn't respond to user input).

I thought of a solution for this, I will call the write report function in a thread and let thread wait for the ack from device. mean while the host application will wait for thread to complete for a specified time and if thread does not respond with in time then it(host) should shutdown the thread.

Now I need your help here, the problem is I donot know how to implement it.( I just konw how to create a thread but have no idea how to wait for sometime and if no response exit the thread).

thanks a lot for your time to read this.
and thnaks for your help if you do so

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.