Access to process memory from external programm

[TIM]

for example i have one simple programm

int main()
{
int test = NULL;
while(1){
printf("%d\n",t est);
getch();
test++;
}
return 0;
}

After compiling and running it, i want to access to its memory adress
location(under windows) from other programm(which i want to write, but
dont know how or better say, from to start :-)) and find this "test"
variable and change its value during programm run-time. How i can do it
from external programm written in C++? Any help would be appreciated. THX.

[Joona I Palaste]

Re: Access to process memory from external programm

TIM <dslest@hot.e e> scribbled the following:[color=blue]
> for example i have one simple programm[/color]
[color=blue]
> int main()
> {
> int test = NULL;
> while(1){
> printf("%d\n",t est);
> getch();
> test++;
> }
> return 0;
> }[/color]
[color=blue]
> After compiling and running it, i want to access to its memory adress
> location(under windows) from other programm(which i want to write, but
> dont know how or better say, from to start :-)) and find this "test"
> variable and change its value during programm run-time. How i can do it
> from external programm written in C++? Any help would be appreciated. THX.[/color]

From the viewpoint of the C standard: You can't. C has no concept of
other processes in the first place.
From a looser viewpoint: Usually processes can't write to each other's
memory space, so you're still out of luck. Some OSes provide the concept
of "shared memory" which might help, but that'd be off-topic here.
YR WLCM.

--
/-- Joona Palaste (palaste@cc.hel sinki.fi) ------------- Finland --------\
\-- http://www.helsinki.fi/~palaste --------------------- rules! --------/
"As a boy, I often dreamed of being a baseball, but now we must go forward, not
backward, upward, not forward, and always whirling, whirling towards freedom!"
- Kang

[TIM]

Re: Access to process memory from external programm

Joona I Palaste wrote:
[color=blue]
> TIM <dslest@hot.e e> scribbled the following:
>[color=green]
>>for example i have one simple programm[/color]
>
>[color=green]
>>int main()
>>{
>> int test = NULL;
>> while(1){
>> printf("%d\n",t est);
>> getch();
>> test++;
>> }
>> return 0;
>>}[/color]
>
>[color=green]
>>After compiling and running it, i want to access to its memory adress
>>location(unde r windows) from other programm(which i want to write, but
>>dont know how or better say, from to start :-)) and find this "test"
>>variable and change its value during programm run-time. How i can do it
>>from external programm written in C++? Any help would be appreciated. THX.[/color]
>
>
> From the viewpoint of the C standard: You can't. C has no concept of
> other processes in the first place.
> From a looser viewpoint: Usually processes can't write to each other's
> memory space, so you're still out of luck. Some OSes provide the concept
> of "shared memory" which might help, but that'd be off-topic here.
> YR WLCM.
>[/color]
LoL how is then written programm such as ARTMONEY? If C doesnt have
concepts of other processes, maybe C++ does? or i must better do it with
ASM?
thx.

[Joona I Palaste]

Re: Access to process memory from external programm

TIM <dslest@hot.e e> scribbled the following:[color=blue]
> Joona I Palaste wrote:[color=green]
>> TIM <dslest@hot.e e> scribbled the following:[color=darkred]
>>>for example i have one simple programm[/color]
>>[color=darkred]
>>>int main()
>>>{
>>> int test = NULL;
>>> while(1){
>>> printf("%d\n",t est);
>>> getch();
>>> test++;
>>> }
>>> return 0;
>>>}[/color]
>>
>>[color=darkred]
>>>After compiling and running it, i want to access to its memory adress
>>>location(und er windows) from other programm(which i want to write, but
>>>dont know how or better say, from to start :-)) and find this "test"
>>>variable and change its value during programm run-time. How i can do it
>>>from external programm written in C++? Any help would be appreciated. THX.[/color]
>>
>>
>> From the viewpoint of the C standard: You can't. C has no concept of
>> other processes in the first place.
>> From a looser viewpoint: Usually processes can't write to each other's
>> memory space, so you're still out of luck. Some OSes provide the concept
>> of "shared memory" which might help, but that'd be off-topic here.
>> YR WLCM.
>>[/color]
> LoL how is then written programm such as ARTMONEY? If C doesnt have
> concepts of other processes, maybe C++ does? or i must better do it with
> ASM?
> thx.[/color]

Read what I wrote. "Some OSes provide the concept of 'shared memory'
which might help, but that'd be off-topic here." C, as such, doesn't
have the concept of other processes, but OS-specific extensions to C do.
The same is true for C++: C++ doesn't have the concept of other
processes, but OS-specific extensions to C++ do.
You can either do it with ASM, or find a C- or C++- compatible library
where someone has already done it with ASM for you.

--
/-- Joona Palaste (palaste@cc.hel sinki.fi) ------------- Finland --------\
\-- http://www.helsinki.fi/~palaste --------------------- rules! --------/
"It's time, it's time, it's time to dump the slime!"
- Dr. Dante

[TIM]

Re: Access to process memory from external programm

Joona I Palaste wrote:[color=blue]
> TIM <dslest@hot.e e> scribbled the following:
>[color=green]
>>Joona I Palaste wrote:
>>[color=darkred]
>>>TIM <dslest@hot.e e> scribbled the following:
>>>
>>>>for example i have one simple programm
>>>
>>>>int main()
>>>>{
>>>> int test = NULL;
>>>> while(1){
>>>> printf("%d\n",t est);
>>>> getch();
>>>> test++;
>>>> }
>>>> return 0;
>>>>}
>>>
>>>
>>>>After compiling and running it, i want to access to its memory adress
>>>>location(un der windows) from other programm(which i want to write, but
>>>>dont know how or better say, from to start :-)) and find this "test"
>>>>variable and change its value during programm run-time. How i can do it
>>>
>>>>from external programm written in C++? Any help would be appreciated. THX.
>>>
>>>
>>>From the viewpoint of the C standard: You can't. C has no concept of
>>>other processes in the first place.
>>>From a looser viewpoint: Usually processes can't write to each other's
>>>memory space, so you're still out of luck. Some OSes provide the concept
>>>of "shared memory" which might help, but that'd be off-topic here.
>>>YR WLCM.
>>>[/color]
>>
>>LoL how is then written programm such as ARTMONEY? If C doesnt have
>>concepts of other processes, maybe C++ does? or i must better do it with
>>ASM?
>>thx.[/color]
>
>
> Read what I wrote. "Some OSes provide the concept of 'shared memory'
> which might help, but that'd be off-topic here." C, as such, doesn't
> have the concept of other processes, but OS-specific extensions to C do.
> The same is true for C++: C++ doesn't have the concept of other
> processes, but OS-specific extensions to C++ do.
> You can either do it with ASM, or find a C- or C++- compatible library
> where someone has already done it with ASM for you.
>[/color]
Thx for help, but i dont like to use someone else work, i like to make
things by myself and learn to new things, only then you get full
control...so i will make it.

[Joona I Palaste]

Re: Access to process memory from external programm

TIM <dslest@hot.e e> scribbled the following:[color=blue]
> Joona I Palaste wrote:[color=green]
>> TIM <dslest@hot.e e> scribbled the following:[color=darkred]
>>>LoL how is then written programm such as ARTMONEY? If C doesnt have
>>>concepts of other processes, maybe C++ does? or i must better do it with
>>>ASM?
>>>thx.[/color]
>>
>> Read what I wrote. "Some OSes provide the concept of 'shared memory'
>> which might help, but that'd be off-topic here." C, as such, doesn't
>> have the concept of other processes, but OS-specific extensions to C do.
>> The same is true for C++: C++ doesn't have the concept of other
>> processes, but OS-specific extensions to C++ do.
>> You can either do it with ASM, or find a C- or C++- compatible library
>> where someone has already done it with ASM for you.
>>[/color]
> Thx for help, but i dont like to use someone else work, i like to make
> things by myself and learn to new things, only then you get full
> control...so i will make it.[/color]

Here, "someone else's work" includes any system core libraries your OS
might have. Depending on your OS, "making things yourself" might even
require implementing your own multi-tasking kernel. This is a very
great deal of work, and overkill just to be able to use shared memory.
Therefore I suggest you first check your own OS's core libraries,
whether they support shared memory. If they do, fine. Otherwise you can
make things yourself or try to find a third-party solution.

--
/-- Joona Palaste (palaste@cc.hel sinki.fi) ------------- Finland --------\
\-- http://www.helsinki.fi/~palaste --------------------- rules! --------/
"I am looking for myself. Have you seen me somewhere?"
- Anon

[Christopher Benson-Manica]

Re: Access to process memory from external programm

TIM <dslest@hot.e e> spoke thus:
[color=blue]
> After compiling and running it, i want to access to its memory adress
> location(under windows) from other programm(which i want to write, but
> dont know how or better say, from to start :-)) and find this "test"
> variable and change its value during programm run-time. How i can do it
> from external programm written in C++? Any help would be appreciated. THX.[/color]

I think Joona meant to post these URL's (didn't you, Joona? ;)):

http://www.ungerhu.com/jxh/clc.welcome.txt

http://www.eskimo.com/~scs/C-faq/top.html

http://benpfaff.org/writings/clc/off-topic.html

--
Christopher Benson-Manica | I *should* know what I'm talking about - if I
ataru(at)cybers pace.org | don't, I need to know. Flames welcome.