ATL / WTL / STL

26-Feb-04 14:51

Hello everyone:
I have a WTL project for GUI and some MFC dlls.
Now there is a problem. In the interface of MFC dlls there are some "CString" data type, If not change these "CString" data types, can I transfer some strings from WTL project to MFS dlls? Is there other ways to relealize it?

Thank you.
-Freehawk

Michael Dunn26-Feb-04 15:30

Michael Dunn

26-Feb-04 15:30

Add this to your stdafx.h before all includes:

#define _WTL_NO_AUTOMATIC_NAMESPACE

Then, if you want the WTL CString, you need to say WTL::CString

--Mike--
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freehawk26-Feb-04 15:44

26-Feb-04 15:44

Thank you for the fast reply.

In my WTL project,

CString a = "1234"; // a is WTL string

// call mfc dll function
SendDataToMFCDll(a);

In my MFC dll
void SendDataToMFCDll(CString a)
{

// a is MFC string
...
}

is it right?

-Freehawk

Michael Dunn26-Feb-04 18:17

Michael Dunn

26-Feb-04 18:17

You may need to throw a (LPCTSTR) cast on the parameter, to properly construct the MFC CString. Aside from that, you should be good.

--Mike--
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freehawk26-Feb-04 18:34

the value of ESP was not properly saved across a function call.

26-Feb-04 18:34

Thank you.

What you said is as the following?

In my WTL project,

CString a = "1234"; // a is WTL string

// call mfc dll function
SendDataToMFCDll((LPCTSTR)a);

In my MFC dll
void SendDataToMFCDll(CString a)
{

// a is MFC string
...
}

-Freehawk

String from VB to VC

SiddharthAtw24-Feb-04 17:59

SiddharthAtw

24-Feb-04 17:59

Please help me I lost my night sleep. Tell in simple code.
From my VB client I am passing simple string "Siddharth", to a win32 dll function GetUserName(DATATYPE)(if DAtatype is BSTR or wstring tell me how to convert it into string in dll function declaration). My program should run in 98 as well as NT. I am trying lot of examples but they all are for long. When I convert it to string nothing works out.

VB client
Dim x as string
x = "String"
GetStringFromVb(wstring *)
end

Win32
GetStringFromVb(wstring*)
{
vector<string> MyString;
MyString.push_back(wstring);
{
//..Lot of string manipulation
}
}

One more issue. in the win32 DLL.h if I declare stl parameter, it is not accepted by the compiler.

Re: String from VB to VC

Anonymous27-Feb-04 1:48

Anonymous

27-Feb-04 1:48

hi sidharth,
when u r passing string in vc++ they are accepted in BSTR format. so u have to first change into CString and then to char* to use it as a string.
function used to perform this is

#include<cstring.h>

CString CString_str = _T("");

if (BSTR_str != NULL) // To be sure that input string is valid...
{
CString s;
LPSTR p = s.GetBuffer(::SysStringLen(BSTR_str) + 1);
BOOL UsedDefaultChar;

::WideCharToMultiByte(CP_ACP, 0, BSTR_str, -1,
p, ::SysStringLen(BSTR_str)+1,
NULL, &UsedDefaultChar);

if (UsedDefaultChar)
// BSTR_str contains an ANSI string
CString_str = (LPCTSTR)BSTR_str;
else
// BSTR_str contains an UNICODE string
CString_str = (LPCWSTR)BSTR_str;
}
char *temp = LPSTR(CString_str);
further if u have to include MFC support at the time of creating new ATL project

I hope it will help u.
Ritu

Re: String from VB to VC

SiddharthAtw27-Feb-04 21:23

SiddharthAtw

27-Feb-04 21:23

Thanx a lot buddy. That was a breather. I will try and get back.But I am not using MFC. and if I include <iostream> it will create conflict. Any way let me try first.

Serialize with WTL

vihieu24-Feb-04 16:24

vihieu

24-Feb-04 16:24

Can i serialize an object with WTL like doing with MFC

vi

Re: Serialize with WTL

Igor Vigdorchik28-Feb-04 19:19

Igor Vigdorchik

28-Feb-04 19:19

You may find it useful:
http://www.codeproject.com/wtl/ArchiveclassWTL.asp[^]

hongzter24-Feb-04 15:45

hongzter

24-Feb-04 15:45

"the value of ESP was not properly saved across a function call." i got this error dialog while compiling a MFC client. the MFC client is empty except for a ATL control added to the UI. the ATL control is empty too. Just as it was 1st created by the wizard.
any idea what's wrong?

Re: the value of ESP was not properly saved across a function call.

Jason De Arte25-Feb-04 8:09

Jason De Arte

25-Feb-04 8:09

Some where, some place, there is a function declaration with the wrong calling convention.

Imagine if you have an exposed function in a DLL that uses the __stdcall calling convention, but your function pointer is declared as __cdecl. Using the function pointer would cause this error.

There's a brief MSDN Dr. GUI article on the topic
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaskdr/html/askgui08072001.asp[^]

Re: the value of ESP was not properly saved across a function call.

hongzter26-Feb-04 14:03

hongzter

26-Feb-04 14:03

apparently the problem is with the compiling computer. it works fine in other computers. i tried installing MS SDK, VC++ SP5, clearing up the registry... and nothing works.. haha.. will be installing a new copy of VC++ today.. thanks for all the help guys. BUnch of great ppl we have here!!!

Can STL be used in a WTL project?

freehawk23-Feb-04 23:22

23-Feb-04 23:22

Hello everyone.
I am a beginner of WTL and STL.
Could you tell me whether STL can be used in a WTL project?

and I need to read data from file line by line,
is there a way to do it like "CStdioFile" of MFC?

Thank you.

-Freehawk

Balkrishna Talele23-Feb-04 23:53

Balkrishna Talele

23-Feb-04 23:53

Hello,
Usel low level or stdio.h in WTL/ATL for e.g
fopen(....);
fwrite(...);
fread(...);
regards
balkrishna talele

freehawk23-Feb-04 23:57

23-Feb-04 23:57

Thank you for the fast reply.

is there way to read file line by line?

-Freehawk

Balkrishna Talele24-Feb-04 0:05

Balkrishna Talele

24-Feb-04 0:05

Hey come on...
if you use

char *readme;
while(!feof(fp))
{
fscanf(fp,"%s",readme);
}
u will get line by line..
cheers
Balkrishna Talele

freehawk24-Feb-04 0:15

24-Feb-04 0:15

Thank you very much.

I will try it.

-Freehawk.

Jörgen Sigvardsson24-Feb-04 3:33

Jörgen Sigvardsson

24-Feb-04 3:33

No you will not. You will get "token by token". Try fgets instead.

--
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Michael Dunn24-Feb-04 6:42

Michael Dunn

24-Feb-04 6:42

No, you will not. The app will crash when it writes to an uninitialized pointer.

--Mike--
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Prakash Nadar26-Feb-04 13:54

Prakash Nadar

26-Feb-04 13:54

There you go, always thinking differetly Smile | :)

I have lost more blood shaving than on the battlefield - Adolf Hitler

Jonas Larsson24-Feb-04 0:23

Jonas Larsson

24-Feb-04 0:23

freehawk wrote:
Could you tell me whether STL can be used in a WTL project?

STL can be used with any C++ project.

freehawk wrote:
and I need to read data from file line by line,

#include < iostream >
#include < fstream >
#include < string >

int main()
{
  std::ifstream f( "c:\\test.txt" );
  std::string fline;
  while(std::getline( f, fline) )
    std::cout << fline << std::endl;

  return 0;
}

---

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freehawk24-Feb-04 17:23