Managed C++/CLI

is there any lose of value ?

6-Nov-02 10:22

i am having a process obgect and i want to get its id in DWORD how to get that process id from csharp project to managed progect code and how to type caste it into DWORD?

r00d0034@yahoo.com

imran_rafique25-Oct-02 16:59

25-Oct-02 16:59

can i type caste WPARAM and LPARAM into Int32 or not.
is there any lose of values;

<big><small></small></big>

Int32 wp=(Int32)wParam;
Int32 lp=(Int32)lParam;

is there any lose of value if i get wParam,lParam like that?

WPARAM wParam=(WPARAM)wp;
LPARAM lParam=(LPARAM)lp;

r00d0034@yahoo.com

C^hris L^osinger25-Oct-02 18:53

C^hris L^osinger

25-Oct-02 18:53

try it. find out.

"[it was..] one of those evenings when you feel that not only will there definitely be a revolution, but that the Association of Manufacturers will foot the bill."
-- Umberto Eco, Foucault's Pendulum

Smaller Animals Software

imran_rafique26-Oct-02 17:59

26-Oct-02 17:59

i chec it but i could not find ?
plz u tell

r00d0034@yahoo.com

Christian Graus22-Nov-02 13:26

Christian Graus

22-Nov-02 13:26

Don't be so stupid. Smile | :)

I really worry when someone is here for so long and continues to post the most basic questions over and over. Are we failing him by answering ? Would he learn if he had to ?

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

ian mariano28-Oct-02 4:03

ian mariano

28-Oct-02 4:03

If you look deep in the bowels of the Platform SDK, you'll see the definition of LPARAM and WPARAM. You'll see that WPARAM is an unsigned integer, while LPARAM is a long. Int32 can handle them because as the .NET C++ reference states: "The size of a signed or unsigned int item is the standard size of an integer on a particular machine. For example, in 16-bit operating systems, the int type is usually 16 bits, or 2 bytes. In 32-bit operating systems, the int type is usually 32 bits, or 4 bytes. Thus, the int type is equivalent to either the short int or the long int type, and the unsigned int type is equivalent to either the unsigned short or the unsigned long type, depending on the target environment." I would take that to mean since .NET isn't 16-bit, that you're pretty safe;]

http://www.ian-space.com/

is it the right code?

imran_rafique23-Oct-02 16:29

Re: is it the right code?

23-Oct-02 16:29

i saved lparam and wparam values when a key
(say U)pressed on a perticuler edit box.
i want to use these values of lparam and wparam again on different edit box.in order to see that key
(say U) .
i have to type caste wparam and lparam into int32 thats why i have type caste into WPARAM and LPARAM.
is that code is correct or not for that purpose?
is there any change in logic if yes then plz tell?

LPEVENTMSG lpEvent= (LPEVENTMSG)lParam;
PostMessage(different_hWnd,
lpEvent->message,(WPARAM)wParam,(LPARAM)lParam);

r00d0034@yahoo.com

Christian Graus22-Nov-02 13:27

Christian Graus

22-Nov-02 13:27

Why do you ask the same questions over and over, just rewording them ?

I'd like to know why you want to control/hijack the login process. I'm not going to give any more help on this neverending quest of yours unless I am convinced it does not have a malicious intent.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Callback in C++ to invoke object in MC++

Elf17-Oct-02 20:54

Elf

17-Oct-02 20:54

Hi!
I have a C++ class with a callback function. Now I wanna use this class in .NET enviroment. So according the guide, i wrap it in a managed class.
But the problem is the callback. The unmanaged class must have an ability to callback the managed class. How can the callback function in unmanaged class get the pointer of the delegate(or something like that) of the managed class?
any suggestion?

Re: Callback in C++ to invoke object in MC++

Nish Nishant17-Oct-02 21:10

Nish Nishant

17-Oct-02 21:10

See my article :-

Implementing Callback functions using IJW (avoiding DllImport)
URL - http://www.codeproject.com/managedcpp/cbwijw.asp
Desc - Shows how you can call native API functions that require callbacks using IJW, and without the use of DllImport attribute. The technique allows you to pass a delegate as the callback function just as in the MS recommended manner except, I show you how to do this without the ugly DllImport attribute.

HTH

Regards,
Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

changing RTF hyperlink appearance w/ C++ .NET

group_captain_mandrake17-Oct-02 17:54

group_captain_mandrake

17-Oct-02 17:54

Is there a way to change the text of a hyperlink in an RTF textbox without altering where the link leads to? For instance, changing links in a block of text to read 'click here' instead of displaying the actual link? I have gone from one end of MSDN to the other as well as every scrap of .NET documentation I can find, and still can't figure this one out. The proggie I'm writing is all .NET so far, and I'd rather not 'mix and match' Confused | :confused:

Calling Nishant S; Nick Parker ; anyone RE CString and /clr

Doug16-Oct-02 12:36

Re: Calling Nishant S; Nick Parker ; anyone RE CString and /clr

16-Oct-02 12:36

Hi folks

Re: ADO.NET : SqlDataReader : I need to assign retrieved value to C++ variable

I have found the source of the problem expressed in the thread "ADO.NET : SqlDataReader : I need to assign retrieved value to C++ variable":
http://www.codeproject.com/script/comments/forums.asp?forumid=3785#xx309754xx

but do not yet know why it occurs or how I can fix it.

The problem arises with the /clr compiler setting.

Here is the code to illustrate this:

/////////////////////////////////////////////////////////

#include <stdafx.h>
#include <cstdlib>
#include "try_ADONET.h"

//#using <mscorlib.dll>
//#using <system.dll>
//#using <system.data.dll> // This is required for the ADO.NET Provider

using namespace std;
//using namespace System;

int Main()
{
CString busNumberSQL[2];
CString bus = "Hello";
busNumberSQL[1] = bus;

return 0;
}

////////////////////////////////////////////////////////

Without the /clr setting the array of CString busNumberSQL[2] is correctly contructed as is CString bus and the line

busNumberSQL[1] = bus;

works as expected. This can be seen by putting a breakpoint in at

return 0;

and seeing the variables in a Watch. Copy the expanded Watch details (Name, Value & Type) to an EXCEL sheet.
..................

Next, add the compiler switch /clr and rerun the code.

CString bus is constructed correctly BUT something weird happens in the construction of CString busNumberSQL[2].

Now,
busNumberSQL[1] = bus;

results in the address of bus as an integer being assigned to busNumberSQL[1], and look at the Watch details!!

Copy the expanded Watch details (Name, Value & Type) to an EXCEL sheet

Name: busNumberSQL; Value: {Length=2}; Type: ATL::CStringT<char,strtraitmfc<char,atl::chtraitscrt<char> > >[] ...(Note no dimension at end compared to the "no /clr" case.
Next Watch line: [0] 2083454756 __int32
Next Watch line: [1] 3103464 __int32

My conclusion is that busNumberSQL[2] is not an array of CString.

Of course, I need the /clr in order to use ADO.NET!

It seems as though a CString works, but a CString array for some (unknown) cannot even be defined.

Do you have any light for me? (I have not got into your previous post yet on Marshall)

Best regards

Doug.

(In case you are wondering I am very much a beginner with C++ and .NET)

Doug

Nish Nishant16-Oct-02 19:23

Nish Nishant

16-Oct-02 19:23

Hello Doug

I compiled and ran this program successfully.

<br />
#include <Stdafx.h><br />
#include <cstdlib><br />
#include <atlstr.h><br />
<br />
#using <mscorlib.dll><br />
#using <System.dll><br />
#using <system.data.dll><br />
<br />
using namespace std;<br />
using namespace System;<br />
<br />
int main()<br />
{<br />
CString busNumberSQL[2];<br />
CString bus = "Hello";<br />
busNumberSQL[1] = bus;<br />
Console::WriteLine(busNumberSQL[1]); //shows "Hello" on my console<br />
return 0;<br />
}<br />

I have no idea why it's not working on your box.

Regards,
Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: Calling Nishant S; Nick Parker ; anyone RE CString and /clr

Doug17-Oct-02 11:09

Re: Calling Nishant S; Nick Parker ; anyone RE CString and /clr

17-Oct-02 11:09

Nish

Thanx

You are correct

Console::WriteLine(busNumberSQL[1]); //shows "Hello" on my console

works, as does

cout << "busNumberSQL[1] = " << static_cast<lpctstr>(busNumberSQL[1]) << endl;

Just a pity you cannot, in this case set up the Watch window as a debugging tool by itself.

Here is what someone wrote :

Quote

I see what you are talking about. Although it is not really a problem but just the way managed code and the CLR interacts with unmanaged code. When you use unmanaged code such as the case with the CString object in your example, and compile with the /clr, the managed executable makes references to the unmanaged objects internally using pointers to its memory location which falls outside the GC managed memory pool. As you have noticed when placing a watch on the unmanaged CString objects which show up as a __int32 type with a value that points to a memory address.

There is nothing wrong with the example you gave in your email. The program still compiles, and the results it produces is as expected. The nice thing with C++.Net is the power of mixing managed and unmanged code in one executable. The power does not come without a price and that is your managed executable with parts unmanaged code, has the same risks as a completely unmanaged executable. The CLR does not offer any protection or resource management to unmanaged objects. So, use the power carefully.

using your example above, if you add to following line to your code you'll see that it still produces the expected results.

Console::Writeline (busNumberSQL[1]);

or even,

printf ("%s",busNumberSQL[1] );

Unquote

http://www.codeproject.com/managedcpp/adonet_mcpp.asp?msg=311206#xx311206xx

Regards

Doug

Doug

Doug17-Oct-02 11:19

ADO.NET : SqlDataReader : I need to assign retrieved value to C++ variable

17-Oct-02 11:19

Correction:

cout << "busNumberSQL[1] = " << static_cast(busNumberSQL[1]) << endl;

should read:

cout << "busNumberSQL[1] = " << static_cast<lpctstr>(busNumberSQL[1]) << endl;

PS.

Apologies for the multiple post - the error of my way has been pointed out to me and will not happen again.

Doug

Doug13-Oct-02 13:31

Re: ADO.NET : SqlDataReader : I need to assign retrieved value to C++ variable

13-Oct-02 13:31

I can get the following to work, the result displaying on the screen:

Console::WriteLine(myReader->GetSqlValue(3));

What I really need to do is to assign the item retrieved to a C++ variable eg.

int halfhrSQL = myReader->GetSqlValue(3);

This gives the C2440 compile error: cannot convert from 'System::Object __gc *' to 'int'.

No matter what cast I use, I cannot get around the error.

Please help if you can.

Thanks, Doug (New Zealand)

Doug

Nish Nishant13-Oct-02 15:05

Nish Nishant

13-Oct-02 15:05

Use Convert::ToInt32

public: static int ToInt32(
   Object* value
);

Regards,
Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: ADO.NET : SqlDataReader : I need to assign retrieved value to C++ variable

Doug13-Oct-02 18:15

Re: ADO.NET : SqlDataReader : I need to assign retrieved value to C++ variable

13-Oct-02 18:15

Hi Nish

Thanks very much for pointing me in the right direction!

I now have the code working:

int halfhrSQL = Convert::ToInt32(myReader->GetValue(3));

It took me a while too find out I had to use GetValue().
Not GetSqlValue(3).
Not GetSqlInt32(3).
Not GetData().
Not GetInt32().

The above compile but throw the following exception:

"System.InvalidCastException : Specified cast is not valid at System.Convert.ToInt32(Object value)"

Best regards

Doug

Doug

Nick Parker14-Oct-02 8:19

Nick Parker

14-Oct-02 8:19

Doug if you are still having a problem you might want to read this[^]
article from MSDN, especially the remarks. Smile | :)

Nick Parker

The greatest lesson in life is to know that even fools are right sometimes. - Winston Churchill

Re: ADO.NET : SqlDataReader : I need to assign retrieved value to C++ variable

Doug14-Oct-02 10:17

Re: ADO.NET : SqlDataReader : I need to assign retrieved value to C++ variable

14-Oct-02 10:17

Thanks everyone, problem solved!;)

Doug

Doug16-Oct-02 12:40

Re: ADO.NET : SqlDataReader : I need to assign retrieved value to C++ variable

16-Oct-02 12:40

Hi Nick

Re: ADO.NET : SqlDataReader : I need to assign retrieved value to C++ variable

I have found the source of the problem expressed in the thread "ADO.NET : SqlDataReader : I need to assign retrieved value to C++ variable":
http://www.codeproject.com/script/comments/forums.asp?forumid=3785#xx309754xx

but do not yet know why it occurs or how I can fix it.

The problem arises with the /clr compiler setting.

Here is the code to illustrate this:

/////////////////////////////////////////////////////////

#include <stdafx.h>
#include <cstdlib>
#include "try_ADONET.h"

//#using <mscorlib.dll>
//#using <system.dll>
//#using <system.data.dll> // This is required for the ADO.NET Provider

using namespace std;
//using namespace System;

int Main()
{
CString busNumberSQL[2];
CString bus = "Hello";
busNumberSQL[1] = bus;

return 0;
}

////////////////////////////////////////////////////////

Without the /clr setting the array of CString busNumberSQL[2] is correctly contructed as is CString bus and the line

busNumberSQL[1] = bus;

works as expected. This can be seen by putting a breakpoint in at

return 0;

and seeing the variables in a Watch. Copy the expanded Watch details (Name, Value & Type) to an EXCEL sheet.
..................

Next, add the compiler switch /clr and rerun the code.

CString bus is constructed correctly BUT something weird happens in the construction of CString busNumberSQL[2].

Now,
busNumberSQL[1] = bus;

results in the address of bus as an integer being assigned to busNumberSQL[1], and look at the Watch details!!

Copy the expanded Watch details (Name, Value & Type) to an EXCEL sheet

Name: busNumberSQL; Value: {Length=2}; Type: ATL::CStringT<char,strtraitmfc<char,atl::chtraitscrt<char> > >[] ...(Note no dimension at end compared to the "no /clr" case.
Next Watch line: [0] 2083454756 __int32
Next Watch line: [1] 3103464 __int32

My conclusion is that busNumberSQL[2] is not an array of CString.

Of course, I need the /clr in order to use ADO.NET!

It seems as though a CString works, but a CString array for some (unknown) cannot even be defined.

Do you have any light for me? (I have not got into your previous post yet on Marshall)

Best regards

Doug.

(In case you are wondering I am very much a beginner with C++ and .NET)

Doug

Doug15-Oct-02 12:17