reading inputs - Managed C++/CLI Discussion Boards

Casting of a Object * to a Enum value question??

araelgig2-Feb-04 1:27

2-Feb-04 1:27

Hi all!

I have a problem with letting the compiler accept the following code, see example below.

I have a logfile that contains statements about variuos actions taken during an installation. The actions are a value of a enum type itemOper = {FileCopy, FileMerge, FolderOk, ...} which is written to the logfile by Enum::GetName(__typeof(itemOper), oper), where oper has one value of the enum type. No FlagAttribute are used.
When i later read the logfile I want to translate the text "FileCopy" back into a value of type itemOper. It works fine in runtime with the debugger and the following code:

Object * item = Enum::Parse(__typeof(itemOper), S"FileCopy");

If i set a breakpoint at a line after this statement the debugger show that the variable item has the value "FileCopy", thats fine!! Now to the problem. The compiler does not allow any cast's or a switch(oper) statement!!!. It does not accept a "if (oper == itemOper::FileCopy)" and so on.

What to do, the base class Enum is usable at some point, but here I'm stuck.
Does anybody know how to "fool" the compiler or does anybody have the right solution??

/Thanks

Re: Casting of a Object * to a Enum value question??

araelgig3-Feb-04 1:08

araelgig

3-Feb-04 1:08

I found the answer!!
I have to unbox the value from the returned Object

itemOper oper = *dynamic_cast<__box itemOper*>(item);

Big Grin | :-D

LNK2005 Error.

adarsh_sebiz1-Feb-04 19:05

adarsh_sebiz

1-Feb-04 19:05

Hi everybody,

I have downloaded latest swfsource form www.sourceforge.com
I am trying to build swfsource using VC++ .NET, but while linking it showing many LNK2005 errors.

I tired /FORCE:MULTIPLE option in Project->Properties->Linker->Command Line, and this option helps me to remove those errors and forcely link swfsource successfully.
This force linking is not generating full swfsource.exe file.

Can anybody suggest me some better solution, which does this linking in normal ways(i.e. without forcefully)?

I am listing down some of those LNK2005 errors that i am getting, below:

Linking...
animate.obj : error LNK2005: _Int64ShllMod32@12 already defined in 8bim.obj
animate.obj : error LNK2005: _Int64ShraMod32@12 already defined in 8bim.obj
animate.obj : error LNK2005: _Int64ShrlMod32@12 already defined in 8bim.obj
annotate.obj : error LNK2005: _Int64ShllMod32@12 already defined in 8bim.obj
annotate.obj : error LNK2005: _Int64ShraMod32@12 already defined in 8bim.obj
annotate.obj : error LNK2005: _Int64ShrlMod32@12 already defined in 8bim.obj
art.obj : error LNK2005: _Int64ShllMod32@12 already defined in 8bim.obj
art.obj : error LNK2005: _Int64ShraMod32@12 already defined in 8bim.obj
art.obj : error LNK2005: _Int64ShrlMod32@12 already defined in 8bim.obj
attributes.obj : error LNK2005: _Int64ShllMod32@12 already defined in 8bim.obj
attributes.obj : error LNK2005: _Int64ShraMod32@12 already defined in 8bim.obj
attributes.obj : error LNK2005: _Int64ShrlMod32@12 already defined in 8bim.obj
avi.obj : error LNK2005: _Int64ShllMod32@12 already defined in 8bim.obj
avi.obj : error LNK2005: _Int64ShraMod32@12 already defined in 8bim.obj
avi.obj : error LNK2005: _Int64ShrlMod32@12 already defined in 8bim.obj
avs.obj : error LNK2005: _Int64ShllMod32@12 already defined in 8bim.obj
avs.obj : error LNK2005: _Int64ShraMod32@12 already defined in 8bim.obj
avs.obj : error LNK2005: _Int64ShrlMod32@12 already defined in 8bim.obj
blob.obj : error LNK2005: _Int64ShllMod32@12 already defined in 8bim.obj
blob.obj : error LNK2005: _Int64ShraMod32@12 already defined in 8bim.obj
blob.obj : error LNK2005: _Int64ShrlMod32@12 already defined in 8bim.obj
bmp.obj : error LNK2005: _Int64ShllMod32@12 already defined in 8bim.obj
bmp.obj : error LNK2005: _Int64ShraMod32@12 already defined in 8bim.obj
bmp.obj : error LNK2005: _Int64ShrlMod32@12 already defined in 8bim.obj
cache.obj : error LNK2005: _Int64ShllMod32@12 already defined in 8bim.obj

there are total around 355 errors of these types..

Please help me..

Thanks in advance..

ADARSH KUMAR SINGLA
S.E.BIZ. INFOTECH. PVT. LTD.,
Chandigarh.

Re: LNK2005 Error.

Mike Dimmick2-Feb-04 2:36

Mike Dimmick

2-Feb-04 2:36

I think the errors are coming from around line 647 of WinNT.h, because the __inline keyword is being ignored. Perhaps your project has a macro called __inline?

Re: LNK2005 Error.

adarsh_sebiz10-Feb-04 1:46

adarsh_sebiz

10-Feb-04 1:46

Hi Mike..

Thankyou very much for replying me...

I find the line 647 in WinNT.h file and looked at the respective keyword
The code at line 647 is as follows:

__inline ULONGLONG
NTAPI
Int64ShllMod32 (
ULONGLONG Value,
DWORD ShiftCount
)
{
__asm {
mov ecx, ShiftCount
mov eax, dword ptr [Value]
mov edx, dword ptr [Value+4]
shld edx, eax, cl
shl eax, cl
}
}

__inline LONGLONG
NTAPI
Int64ShraMod32 (
LONGLONG Value,
DWORD ShiftCount
)
{
__asm {
mov ecx, ShiftCount
mov eax, dword ptr [Value]
mov edx, dword ptr [Value+4]
shrd eax, edx, cl
sar edx, cl
}
}

__inline ULONGLONG
NTAPI
Int64ShrlMod32 (
ULONGLONG Value,
DWORD ShiftCount
)
{
__asm {
mov ecx, ShiftCount
mov eax, dword ptr [Value]
mov edx, dword ptr [Value+4]
shrd eax, edx, cl
shr edx, cl
}
}

The solution suggested by you seems to be very beneficial to me..
but, i am not getting the solution suggested by you regarding __inline keyword in WinNT.h file,

So, Please suggest me solution in detail i.e. what i have to do to remove this error..

Thanks in advance.

ADARSH
S.E.Biz. Infotech Pvt. Ltd.,
Chandigarh.

argument and matrix

Dheeraj Mehta1-Feb-04 18:10

Dheeraj Mehta

1-Feb-04 18:10

can we send a two dimensional array as an argument????

set /clr option in MFC application?

scoct31-Jan-04 21:10

scoct

31-Jan-04 21:10

Can any experts in MFC application be kind and show me the way to setting the /clr options in MFC application type? There are too many restrictions and constraints (not compatible with /Gm, /ZI....etc) with this option on.

Currently cant seem to include "using <mscorlib.dll>" in MFC application. Any one care to tell me why and any solution? many thanx..

- -sC- -

reading inputs

Liyana30-Jan-04 12:13

Liyana

30-Jan-04 12:13

can someone tell me how do i read inputs from a text file?

(im still a beginner in C++,iv pored through a number of books but none has enlightened me..:sigh

the input is made of a hexadecimal number on each line, till the end of the file. the hex numbers represent an 8-bit number.

how do i convert the hex number to binary instead, upon reading it?

im aware that each character will be read in ASCII (correct me if im wrong)and stored into an array before the programmer can convert it to hex instead. but i dont know how the coding is like.

if im not mistaken, each input will be placed in a [1x8] array (or matrix). how do i change it into an [8x1] array instead, with the bit-0 placed as the first element of the new [8x1] array?can someone tell me the exact code please?

many thanx..

Re: reading inputs

Roger Wright3-Feb-04 4:25

Roger Wright

3-Feb-04 4:25

You're not getting much response to this, are you? Smile | :)

Okay, though I'm a beginner, too, I'll take a crack at it...

First, to read the file you can use fopen and streams, or CFile and a character buffer. Streams make me crazy, so I don't use them yet, but you may have better luck with them.

Converting the individual characters to integer values is easy. Use isdigit(ch) on each character read to find out whether it's in the range 0 to 9. If it is, use atoi(ch) to return the value as an integer. For characters A to F, I'd first check using isalpha(ch) to filter out carriage returns and such, then apply toupper(ch) to make them upper case, then a ~~Select~~ (oops) Switch statement to set the values (case 'A': value=10; case 'B':value=11; etc).

Combining two input characters into a one byte hex number is straighforward, I think. I'd try taking the first int value and shift it left (value<<4) by four bits, then add the second value to it. The lower byte of the int result should be the binary value you're looking for.

As for the rest - I don't understand the question well enough to guess. Could you clarify what you're trying to do with the array thingy?

As I said, I'm a beginner too, so any of the above may be entirely wrong. But that's the approach I'd start with, then let the many error messages that result lead me to a correct solution. Hopefully this is enough to get you started. Good luck! Big Grin | :-D

Heard in Bullhead City - "You haven't lost your girl -
you've just lost your turn..." [sigh] So true...

Re: reading inputs

Nik Vogiatzis18-Feb-04 17:22

Nik Vogiatzis

18-Feb-04 17:22

hmmm...

i won't give you the 'exact code' because this sounds like a homework question, but i will do this for you...

1. a [8x1] matrix is the transpose of a [1x8] matrix, hence they are identical (in the case of [qx1]/[1xq] matrices).

2. if you use a 'vector' type like a queue or a stack, then this will be your 'vector', else just create an array, i.e. char a[8];

3. assuming the number you are talking about is a character that represents a hex number like "^B" = 0x02h or "^J" = 0x08h, then what you will need to do is to bitwise 'AND' (which is a singular & not the AND operator which is &&) each bit position to find out whether the bit is set or not...
eg:

10010110 &<br />
     00000010<br />
     ========<br />
     00000010<br />

to do that calculation you would do something like
(var & 0x02)? 1:0;

i.e. if the result of the bitwise & is true return 1 else return 0.

so, you will need to bitwise AND it with

0x01   // 2^0 = 0000 0001
0x02   // 2^1 = 0000 0010
0x04   // 2^2 = 0000 0100
0x08   // 2^3 = 0000 1000
0x10   // 2^4 = 0001 0000
0x20   // 2^5 = 0010 0000

that should give you enough of the pattern for you to do the rest yourself...

4. finally, you can place the result of the bit in any order you want...

as for storing the ASCII character in an array first, this is highly unnecessary, you should be able to process each character as it comes through the stream...

try that, show me your results and if it looks like you need more help, we can try from there...

hope this 'enlightens' you a little more... the joy of programming is the 6 weeks of frustration followed by a fleeting 'ah' that signals the moment of complete enlightenment... it is the drug all programmers work towards... Smile | :)

cheers and good luck
nik

Nik Vogiatzis
PhD Candidate: University of South Australia
+++++++++++++++++++++++++++
Developing new generation Traffic Micro-simulation Tools for Traffic Engineers
em: nikolaos.vogiatzis@unisa.edu.au

C++ and Database

vin29-Jan-04 19:22

vin

29-Jan-04 19:22

Hi,

Is there any article available here which gives me an idea of connecting a c++ application to the database. I want to write a console database application. I don't want to use the MFC classes.

Can anyone help me, pls? Thanks in advance..

regards,

vini

Re: C++ and Database

Selvam R2-Feb-04 6:31

Selvam R

2-Feb-04 6:31

Hello,

try this,

http://www.codeproject.com/managedcpp/adodemo.asp

With Regards,
R.Selvam

Virtual destructor causes LNK2001 !!!

balkanese27-Jan-04 22:18

balkanese

27-Jan-04 22:18

Hi everybody!

I encountered the following problem:

I created a "class library (.NET)" project and made a first build, which produced a warning:

nochkclr.obj : warning LNK4099: PDB 'libc.pdb' was not found with 'C:\Programme\Microsoft Visual Studio .NET 2003\Vc7\lib\nochkclr.obj' or ...[/quote]

Ok, I ignored this warning and used the Wizard to generate a "Generic C++ class" with a virtual destructor. When I now try to rebuild my project I get two linker errors:

wiz.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@$$FYAXPAX@Z)

and

wiz.obj : error LNK2001: unresolved external symbol "void __stdcall `eh vector destructor iterator'(void *,unsigned int,int,void (__thiscall*)(void *))" (??_M@$$FYGXPAXIHP6EX0@Z@Z)

When I remove the "virtual" keyword in front of the destructor declaration both linker errors disappear!!! What the @&%$ is going on here?!?!

Thank you for your help,
Matej

swfsource: wanted code regarding creating buttons, please help!

adarsh_sebiz26-Jan-04 23:29

adarsh_sebiz

26-Jan-04 23:29

Hi everybody..

I have downloaded latest swfsource from www.sourceforge.com
It is a very good swfsource, which includes almost all the required features..

I gone through this swfsource, and became successfull in drawing simple shapes like rectangle, circle, triangle, curved-edged rectangle.....

I also tried drawing Gradients and buttons using this swfsource, but still not succeded..
Can anybody help me by sending the code(in swfsource) for drawing Gradients and Buttons?

thax in advance..

with regards,

ADARSH
Junior S/W Developer,
SEBIZ INFOTECH PVT. LTD.,
CHANDIGARH.

licensed control?

Roger Alsing26-Jan-04 22:56

Roger Alsing

26-Jan-04 22:56

how can i use a licensed control in managed vc++??

in c# when you add a licensed control to a form you get an embedded resource ("licenses.licx") file that tells vs.net to compile the license into the host app..

how does this work in vc++?

//Roger

How can I get the name of current theme from OS?

rafamarmar25-Jan-04 5:36

rafamarmar

25-Jan-04 5:36

Hi everybody:

I'm doing my first application in .NET.

I know how use in my application the Visual Xp Styles.
//before running in main form.
Application::EnableVisualStyles()

But, is not exactly that I want. I only want get, at runtime, the name ( or any other ID ) of the current actived Theme from OS Windows, and (if is XP) current actived Visual Style.

Can anybody help me? Confused | :confused:

Advanced Thanks.
Best Regards.

class wide arrays?

paulcsf24-Jan-04 12:40

paulcsf

24-Jan-04 12:40

Hello all,

I have an application, where I want to share an array between all member functions of the class. I have tried everything I can think of, but with no luck.

In my constructor (which works fine) I have:

Button * button __gc[] = new Button() * [20];

But I can not access that array outside of the constructor, and I can not declare the array as a public member of the class...

Any help would be great.

Thanks,

Paul

Server 2003 DDK, ZMODEM

Shahin7723-Jan-04 6:42

Shahin77

23-Jan-04 6:42

Hi,

Dose anybody know where can i download "Server 2003 DDK", and i need to write a program to comunicate and transfer files with a remote computer via modem with this protocols (ZMODEM/XMODEM), can you send me some hint or source code links to help me to start it.

Thanx in advance. Confused | :confused:

Registering Key events when minimized

Tank_Aviator22-Jan-04 18:22

Tank_Aviator

22-Jan-04 18:22

How would I get an application to register a keydown, keyup, or keypressevent while it is minimized?

James Meade
vENS vUSN
vOPSOFF VAQ-140

Using old STRUCTs in managed classes

Nik Vogiatzis21-Jan-04 19:47

Nik Vogiatzis

21-Jan-04 19:47

hi all...

my problem seems fairly straight forward, but, here goes...

i have a struct definition that uses bit fields (want to keep that), but i need it called from a managed class...

i know i can't do that unless the struct is also managed... any way i can do this without loosing the bit fields?

e.g.

		struct SVSRecTypeA<br />
		{<br />
			unsigned		year	:12;<br />
			unsigned		mon	:4;<br />
			unsigned		day	:5;<br />
			unsigned		hr	:5;<br />
			unsigned		min	:6;<br />
			unsigned char	timeperiod;<br />
		};<br />
<br />
                public __gc class Class1<br />
                {<br />
                  SVSRecTypeA *s;<br />
                };<br />

the code above i know will cause an error, but using public __gc struct Struct will also fail if i include the bit fields...

can anyone point me in the right direction?

cheers
nik

Nik Vogiatzis
PhD Candidate: University of South Australia
+++++++++++++++++++++++++++
Developing new generation Traffic Micro-simulation Tools for Traffic Engineers
em: nikolaos.vogiatzis@unisa.edu.au

Declaring indexed property in C++ Class Library

fin21-Jan-04 12:51

fin

21-Jan-04 12:51

Index properties in C++ class libraries (.NET) apper as set_ and get_ methods when used in C#.
To test this out, I changed the example from section "13.2 Indexed Properties" in MSDN, and placed the Employee and Manager classes in a library. Then I wrote a C# application to implement the code from main(). What happens is that everyting works fine except when trying to call the indexed properties.

Example:
The following line does not work (as it does in C++):
Ed.Report[ Bob.name ] = Bob;

But instead the following works:
Ed.set_Report( Bob.name, Bob );

This just doesn't look right?
Anybody got a clue?

-Fin

Mystery solved

fin21-Jan-04 17:23

fin

21-Jan-04 17:23

Thanks to Tomas Restrepo (MVP) there is a logical explanation for this (as usually). See http://www.winterdom.com/mcppfaq/archives/000125.html[^]

This means that whenever you implement an interface with get_Item and/or set_Item, such as IList in C++, you need to add:
[System::Reflection::DefaultMemberAttribute("Item")]
before the class definition in order to make it user friendly in C#:
myCollection[0] = "First";
instead of:
myCollection.set_Item(0, "First");

-Fin

Converting a Byte[ ] into a User Defined Structure

olstuff21-Jan-04 6:46

olstuff

21-Jan-04 6:46

I am converting some old DOS stuff into MC++ and have some structures i need to use. I am not keeping the old structures, but i am rewriting them in MC++ so they are going to be managed structures like the one below

struct MyStruct
{
DWORD Value1;
DWORD Value2;
}

What i need to do is take a fixed size Byte array (that i am getting from a socket) and cast it into this structure.

Any help on this would be great thanks.

Re: Converting a Byte[ ] into a User Defined Structure

toxcct27-Jan-04 3:57

toxcct

27-Jan-04 3:57

you write in C++ that's fine. what you can do is creating a cast operator which is a member of your struct (that's allowed in C++, but not in C)...

in your code, that would finally look that :

<font style="color:blue;">char</font> MyCharTab[] = <font style="color:green;">//...</font>;
MyStruct StructObj = (MyStruct)MyCharTab;

TOXCCT

Dynamically invoking classes

Tank_Aviator20-Jan-04 12:49

Tank_Aviator

20-Jan-04 12:49

I have a public __gc class named Zones. At program startup I want the program to read a data file, and dynamically invoke instances of Zones depending on how many are listed in the .dat file.

--Example of .dat file
[Zone1]
name=test1
loc=coords1

[Zone2]
name=test2
loc=coords2

[zone3]
name=test3
loc=coords3

I would like to create a filestream and streamreader, create an instance of the class Zones, input the first 4 lines of data (first and 4th are non-necessary), and then peek at the next line. If the peek != NULL, then loop back up to create a 2nd instance, etc etc etc until it gets to the end of the file which would be a blank line. Then I can perform calculations and find out which is the closest to me (according to my location coords from another class (public __gc class MyLoc)) and info like that.

James Meade
Tank
vENS vUSN
VAQ-140 Patriots

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