C / C++ / MFC Discussion Boards

David Crow15-Sep-05 7:38

15-Sep-05 7:38

hervy wrote:
File: afxwin2.inl
Line: 96

So have you looked at line 96 of afxwin2.inl to see what expression is evaluating to false?

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

Using Crystal Report in VC++6.0

cofd15-Sep-05 0:38

cofd

15-Sep-05 0:38

hi, buddy

i use Crystal Report in my Vc++6.0 project, now i have a problem.

when creating a instance of IApplicationPtr using

try<br />
	{<br />
		// create the instance of Application object<br />
		m_pApplication.CreateInstance( __uuidof(Application) );<br />
	}<br />
	catch( _com_error& e )<br />
	{<br />
		HandleError( e );<br />
	}

there is no exception, but m_pApplication is still NULL, what's wrong? D'Oh! | :doh:

Re: Using Crystal Report in VC++6.0

prasad_som15-Sep-05 3:14

prasad_som

15-Sep-05 3:14

just a check, have you used CoInitialize()

Linking advapi32.lib

Rainos15-Sep-05 0:36

Rainos

15-Sep-05 0:36

Dear fellow software engineers,

Im trying to link some example code from the MDSN website into my visual C++ project
and i get the following error. can you help?

Linking...
OLMECDlg.obj : error LNK2001: unresolved external symbol "int __cdecl
CheckTokenMembership(void *,void *,int *)"
(?CheckTokenMembership@@YAHPAX0PAH@Z)
Debug/OLMEC.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

the example code i was using was as follows:

#include
#include

extern BOOL CheckTokenMembership(HANDLE TokenHandle,PSID SidToCheck,PBOOL
IsMember);

/*++
Routine Description: This routine returns TRUE if the caller's process
is a member of the Administrators local group. Caller is NOT expected
to be impersonating anyone and is expected to be able to open its own
process and process token.
Arguments: None.
Return Value:
TRUE - Caller has Administrators local group.
FALSE - Caller does not have Administrators local group. --
*/
BOOL COLMECDlg::IsUserAdmin(VOID)
{
BOOL b;
SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;
PSID AdministratorsGroup;

b = AllocateAndInitializeSid(
&NtAuthority,
2,
SECURITY_BUILTIN_DOMAIN_RID,
DOMAIN_ALIAS_RID_ADMINS,
0, 0, 0, 0, 0, 0,
&AdministratorsGroup);

if(b)
{
if (!CheckTokenMembership( NULL, AdministratorsGroup, &b))
{
b = FALSE;
}
FreeSid(AdministratorsGroup);
}

return(b);
}

Please note that I have also setup my linker to include advapi32.lib but
this still fails. What am i doing wrong or is there a mistake on the MSDN
webpage?
(http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthz/s
ecurity/checktokenmembership.asp)

Has anyone used this function before,Can anyone help?

thanks,
Rainos

Re: Linking advapi32.lib

prasad_som15-Sep-05 1:56

prasad_som

15-Sep-05 1:56

it seems winbase.h is updated with .net version.you need to use this code in
.net IDE.
refer this link http://www.codeproject.com/win32/accessctrl2.asp[^],too.

Re: Linking advapi32.lib

Blake Miller15-Sep-05 4:34

Blake Miller

15-Sep-05 4:34

Or... The function is not a C++ decorated function, of which MOST of the Win32 API is not...

So, try this instead:

extern "C" {
extern BOOL CheckTokenMembership(HANDLE TokenHandle,PSID SidToCheck,PBOOL
IsMember);
}

Recompile and relink, see if that works for you Wink | ;)

Saving configuration option data

karmendra_js14-Sep-05 23:26

karmendra_js

14-Sep-05 23:26

I have configuration dialogbox where the user uses the combo box to select and set the configuration.

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

Thanks,
KarmU

Re: Saving configuration option data

kakan14-Sep-05 23:44

kakan

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

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