Managed C++/CLI

23-Mar-06 19:19

hi,all
i am a new comer to this group
While programming i got an error which is some reference error or some thing else
Anyways i will give u my doe pls help me

#include <conio.h>
#include <string.h>
#include <iostream.h>
char* rmstr(char *whstr, char *strm)
{
char *ptr,*rem;
char temp[20];
clrscr();
int k=0;
do
{
ptr=strstr(whstr,strm);
if (ptr==NULL)
{
break;
}
for (int i=0;i

2bee 23-Mar-06 20:56

23-Mar-06 20:56

Would you mind posting it again? But this time please check "Ignore HTML tags in this message (good for code snippets)" because the code you've posted is currently incomplete.

for instance:
>> for (int i=0;i{
>> temp[k++]=whstr[i];
>> }

btw. The line below is probably causing your trouble.

strcpy(rem,whstr);

The rem pointer has not been initialized before or to be more precise you haven't allocated any memory, even though you're applying strcpy on it.

cheers Tobias

Shamnar23-Mar-06 23:49

23-Mar-06 23:49

oh........
thanks for this valuable help
its get ok when i initialised it as u suggest
thanks thanks thanks a lot

shamnar

Shamnar26-Mar-06 18:53

26-Mar-06 18:53

sir
this time i met with another problem.
that is
if my input to the fn is "thisa" "is" then i am getting o/p "thisa" instead of "tha"
please help me.
now i am sending the code along with this mail
#include <conio.h>
#include <stdio.h>
#include <string.h>
char* rmstr(char *whstr, char *strm)
{
char *ptr,*rem="";
char temp[10];
clrscr();
int k=0;
do
{
ptr=strstr(whstr,strm);
if (ptr==NULL)
{
break;
}
for (int i=0;i<ptr-whstr;i++)
{
temp[k++]=whstr[i];
}
ptr=ptr+strlen(strm);
strcpy(rem,whstr);
rem=rem+strlen(strm);
strcpy(whstr,ptr);
}while(1);
temp[k]='\0';
strcat(temp,rem);
return(temp);
}

void main()
{
char *temp;
stcpy(temp,rmstr("thisa","is"));
cout<<temp;
}

shamnar

2bee 26-Mar-06 19:56

26-Mar-06 19:56

Hi,

as I said before, look at your memory allocation.

// this won't work unless you initialize *temp
char *temp;
stcpy(temp,rmstr("thisa","is"));

// for instance
char *temp = new char(256);
strcpy(temp,rmstr("thisa","is"));

Oh, and by the way this won't work either:

char *ptr,*rem=""

you have initialized that rem pointer, but with a reference to an empty string. As long as there is no memory assigned to it strcpy(rem,whstr); will fail. In addition I would really recommend you to have a look into a C/C++ tutorial, because this knowledge is essential.

regards Tobias

-- modified at 2:06 Monday 27th March, 2006

Shamnar26-Mar-06 21:32

26-Mar-06 21:32

could you send me a function which accepts two strings as i/p and returns another string which doesnt contain the second string in first string
for eg if i call like this
rmstr("this","is")
it should return "th"
sir please dont use std::string because my compiler is not supporting it
anyways thanks for ur valuable help, let me acknowledge for ur kindness to spend time for this.

shamnar

2bee 27-Mar-06 0:41

27-Mar-06 0:41

Shamnar,

let me guess, that is your homework??? I mean it is a little obvious if you say that you cant use std::string due to your compiler. Well it might be or not, however those pointer stuff is essential. I do understand that it is quite weird stuff but it won't get you far if don't how to deal with it.

However, i've just programmed that function. But to make it not too easy i have removed some parts from it.

char* rmstr(char* searchstring, char* morphem)
{
char* tmp;
char* resultstring = new char(strlen(searchstring));
*resultstring = '\0';

while( ( tmp = strstr(searchstring, morphem)) )
{
int len ...;
char* result = new ...;
strncpy(...);
searchstring = (...);

*(result+len) = '\0';

strcat(...);
}

return resultstring;
}

Tobias

Getting an error

Shamnar27-Mar-06 22:58

Nested class; accessing non-static members from the enclosing class

27-Mar-06 22:58

finaly i did it.
thanks for ur advices and clues u have given to me.
but i made one more instruction. i am sending it along with this
char* rmstr(char* searchstring, char* morphem)
{
char* tmp;
char* resultstring = (char *) malloc(strlen(searchstring));
*resultstring = '\0';

while( ( tmp = strstr(searchstring, morphem))!='\0')// )
{
int len=strlen(searchstring)-strlen(tmp); //...;
char* result = (char *) malloc(len);//...;
strncpy(result,searchstring,len);//...);
searchstring = tmp+strlen(morphem);//(...);
*(result+len) = '\0';
strcat(resultstring,result);//...);
free (result);
}
if (searchstring!='\0')
strcat(resultstring,searchstring);
free (resultstring);
return resultstring;
}
thanks for make me to study pointers.

shamnar

Douglas Dean23-Mar-06 6:34

Re: Nested class; accessing non-static members from the enclosing class

23-Mar-06 6:34

Is there any way in a nested class to access non-static members from the current instance of the enclosing class? ex.

class outer<br />
{<br />
	public:<br />
		int m_value;<br />
		int m_value2<br />
<br />
		class inner<br />
		{<br />
			int getAccess()<br />
			{<br />
				// ?? How to do it ??<br />
				return (??)m_value;<br />
			}<br />
		}<br />
}<br />

Thanks
Doug

Douglas Dean23-Mar-06 6:37

Re: Nested class; accessing non-static members from the enclosing class

23-Mar-06 6:37

Make that...

__gc class outer<br />
{<br />
    public:<br />
        int m_value;<br />
        int m_value2<br />
<br />
        __gc class inner<br />
        {<br />
            int getAccess()<br />
            {<br />
                // ?? How to do it ??<br />
                return (??)m_value;<br />
            }<br />
        }<br />
}<br />

...forgot the managed qualifiers...

2bee 23-Mar-06 8:48

Re: Nested class; accessing non-static members from the enclosing class

23-Mar-06 8:48

Hi Douglas,

I don't know exactly if this helps but I'll give it a try. Basically i have just converted the C# example of nested classes into C++/CLI. It seems to me that this is a way to get it working (it actually did work):

public ref class Container
{
public:

Container(void);

private:

int m_value;

public:

void SetValue(int pVal)
{
m_value = pVal;
}

public:

ref class InnerClass
{
private:

Container^ m_parent;

public:

InnerClass(void) {};

InnerClass(Container^ parent)
{
m_parent = parent;
}

public:

int getAccess()
{

return m_parent->m_value;
}
};
};

Container^ outer = gcnew Container();
Container::InnerClass^ nested = gcnew Container::InnerClass(outer);

Console::WriteLine(nested->getAccess()); // prints 4

outer->SetValue(5);

Console::WriteLine(nested->getAccess()); // prints 5

hope this helps,

best regards Tobias

Douglas Dean23-Mar-06 10:03

Re: Nested class; accessing non-static members from the enclosing class

23-Mar-06 10:03

Yeah, that's what I ended up doing. I wonder if there's a cleaner way, though...

Douglas Dean23-Mar-06 10:04