Managed C++/CLI

Re: Understanding pointers

11-Sep-07 17:52

int* ptr; and int *ptr; mean the same. It's just a difference in coding style.

Dynamic "memory" allocation deals with your code asking the operation system to reserve memory for your variable. The memory remains reserved for your variable until your code explicitly ask the operating system to unreserve the memory. You have a memory leak if you fail to unreserve your variable's allocated memory before your application stops executing your code.

Please ask C++ questions in the C++ forum.

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Hamid_RT12-Sep-07 23:07

Hamid_RT

12-Sep-07 23:07

No its not its a global variable int *pPointer; not local and first section of your question they are same.

Re: [Message Deleted]

Russell^'13-Sep-07 22:19

Russell^'

13-Sep-07 22:19

I think it is not a good idea to delete the messages,...expecially if you delete the question!
If you solve your problem you could vote 5 to who solve it for you and (if you want) you can change the title of your question adding a prefix like [SOLVED].
The reason is that someone could have your same problem, and he can learn from what you and the other poster wrote.
Thanks Smile | :)

Russell

Re: [Message Deleted]

George L. Jackson14-Sep-07 11:36

Help me about " template"

14-Sep-07 11:36

Thanks for that comment and I gave you a 5! Most of the time, I give answers without replies or ratings (good or bad). Feedback helps me to improve.

Geo.

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Re: [Message Deleted]

Russell^'14-Sep-07 22:29

Russell^'

14-Sep-07 22:29

George L. Jackson wrote:
Feedback helps me to improve.

Nice

Russell

setup project

Franken10-Sep-07 9:15

Franken

10-Sep-07 9:15

Hi everybody,

I've written a mfc application which uses dundas gauge controls (together with windows forms). Everything works fine in debug or release mode but when I try to install the software on a different machine (windows XP, freshly installed) the application don't even start. Actually the installation works fine but the software don't run. I've checked all dependencies with dependency walker and also included "DundasWinGauge.dll" in the setup project (VS2005 setup wizard). DotNet is installed on the target machine. If I exclude the dundas gauge control then the application also runs on the target machine.

Does anybody have an idea?

Best regards,
Frank.

ubriela10-Sep-07 5:26

ubriela

10-Sep-07 5:26

How can I use the word string as a data type, like int?
C++ does not support it? ?
#define string char * ????? // some time it is wrong
Suppose that I have a header file for a template class: dummy.h

#ifndef DUMMY_H_
#define DUMMY_H_
// phototype
template<class t="">
class dummy
{
dummy();
public:
void read();
// void get_value(T&);
private:
T value;
}
// Implimentation
.......
template<class t="">
void dummy<t>::read()
{
cin>>value;
}
.......
#endif

// test
#define string char *
main()
{
dummy<string> name; // object name
name.read(); // -> an error occurs
.......
}

Why is that? if I replace string by int
dummy<int> name;
name.read() // NO PROBLEM

I knew my fault.... cin>>name can't be used for char * (pointer)
but I want to use string as a data type, so that I can declare: dummy<string> name;
Can you have me?
thanks a lot....

ubri

Re: Help me about " template"

Mark Salsbery10-Sep-07 5:46

Re: Help me about " template"

10-Sep-07 5:46

ubriela wrote:
#define string char *

Besides the fact that you are posting this in the wrong forum
(this should be on the Visual C++/MFC board)...

What's the error you are getting? I can't read your code without
the angle brackets on your template code...

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Hamid_RT12-Sep-07 23:10

Hamid_RT

12-Sep-07 23:10

It seems you want to use of templates but can you write fully template code and does your question on the C++/CLI?

usb otg???

kutalinelucas10-Sep-07 1:24

kutalinelucas

10-Sep-07 1:24

hey all. i was wondering if i could get a bit of advice. Im a final year robotics student and i've just had a new idea for my dissitation project, but im not sure if its viable. The part im unsure of would be a usb keyboard feeding text into a c++ application.

I have a basic understanding of c++, some asm programming via a 8051 processor and i've just ordered some usb interfacing books, to help me along with creating a driver and bus. I should be able to manage it for a pc, but could the same driver and software work on a pda running windows and usb otg ?(although i know otg bus is diffrent, but back compatible form usb)

As i said i haven't really researched into it yet, so it's just off the top of my head at the moment. Any advice or points to references would be great.

cheers.

Lucas.

Re: usb otg???

Mark Salsbery10-Sep-07 5:49

redefinition error (Library)

10-Sep-07 5:49

You may want to look up at the list of message boards and find a more appropriate one
for your question. You may get more help that way Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

palanirajan10-Sep-07 0:03

palanirajan

10-Sep-07 0:03

hi iam using two different library in my application class
this two library using one struct with the same name,

when i try to include this two library header file in my application class
iam getting redefinition error

i dont have the source to include namespace in the library

how to include this two library file in my application class without this redefinition error

thanks and regards
shivapalanirajan krj.

iam a software engineer working for varisis technologies bangalore

Re: redefinition error (Library)

Mark Salsbery10-Sep-07 5:51

Help with accessing COM component.

10-Sep-07 5:51

Please post C/C++ questions that DON'T relate to Managed C++/CLI
on the visual C++/MFC board[^]

Without the source code you're screwed. Maybe you can wrap one of the header files
in another header file of your own, which wraps one of the headers in a different namespace.
I don't know if it would work or not...

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

art_ami9-Sep-07 19:28

art_ami

9-Sep-07 19:28

I am having problems accessing some of the methods of a COM component .

Method Signature in a com component as follows:

HRESULT Getvalues(int i, int j , VARIANT &varval);

When adding reference of our COM component to the .Net code . .NET has converted the method to as follows:

System: object^ GetValues(int i , int j );

There is a invalid variant exception while executing GetValues(int i , int j ) from .Net application(Mixed Mode C++ application in VS 2005)

How do determine the call to COM function was successfull?
In the old native code HRESULT inidcated that the function call was successful or not.
So what is equivalent of HRESULT in Managed Wrapper for COM component?

Thanks a lot for the help,
Arti

Help with C program [modified]

eitwoman8-Sep-07 13:21

eitwoman

8-Sep-07 13:21

Hi

I have a C program that has three edit text boxes to enter the month, day and year. I also have an LTEXT field labeled Age. Is there a way that I can display the age after the month, day and year are entered. I have the program calculating the age but I cannot get it to display the age on the screen after the month day and year are entered.

Thanks

-- modified at 10:31 Monday 10th September, 2007

Marsha Eiter

Mark Salsbery9-Sep-07 7:54

9-Sep-07 7:54

If you're not using managed C++, then you're posting your question on the wrong board.
You should post on the Visual C++/MFC board.

eitwoman wrote:
Is there a way to code the program that is a user enters the month, day or year instead of selecting it from the drop-down list that the system will automatically select the index of the month, day and year of the number that they entered?

Yes.

You could also look into using the Month Calendar Control[^].

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

eitwoman10-Sep-07 1:59

eitwoman

10-Sep-07 1:59

Thanks I appreciate it but the user was pretty clear on wanting to be able to enter the data by hand.

I appreciate the suggestion though!

Marsha

Marsha Eiter

Mark Salsbery10-Sep-07 6:53

10-Sep-07 6:53

The SetWindowText() API can be used to set the text of the LTEXT control.

To convert a numeric age value to a string for display, you could use the CRT
sprintf_s() function.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

eitwoman10-Sep-07 10:00

eitwoman

10-Sep-07 10:00

Thanks I appreciate the help. I will try this and let you know.

Marsha

Marsha Eiter

Array and String

pourang7-Sep-07 21:58

pourang

7-Sep-07 21:58

char alpha[10] = "abcdefg";

string beta = "abcdefg";

alpha[1]= '\0'; gives the following result : alpha = a

beta[1]='\0'; gives the following result : beta = a cdefg

How can i use '\0' in strings as i use them in an array? I mean iwant that '\0' replace 'bcdefg' in string not just 'b'.

Thanks

ubriela7-Sep-07 23:00

ubriela

7-Sep-07 23:00

#include<stdio.h>
void main()
{
char string1[10]="abcdef";
char string2[10]="abcdef";
string1[1]='\0';
string2[1]='\0';
printf("%s\n%s",string1,string2);
}
result:
a
a
----
i don't think it is wrong Roll eyes | :rolleyes:

ubri

George L. Jackson8-Sep-07 5:27

8-Sep-07 5:27

Unfortunately, he is trying to modify a std::string and not a char array string.

"We make a living by what we get, we make a life by what we give." --Winston Churchill

pourang10-Sep-07 4:20

pourang

10-Sep-07 4:20

Thanks for the tip Smile | :)

{
in a land with no bird, no spring. My first journey was a
return 0;
}

George L. Jackson8-Sep-07 5:23