C++ - code executed upon definite program termination
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I'd like to have a piece of code executed upon definite end of a program.
atexit()is not appropriate because there may be some code executed when destructing static objects and this function does things beforehand.You could execute your program via, for instance CreateProcess[^] (see also "CreateProcess() and wait for result"[^]), then wait for the program termination and eventually execute the 'piece of code'.
Veni, vidi, vici.
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I'd like to have a piece of code executed upon definite end of a program.
atexit()is not appropriate because there may be some code executed when destructing static objects and this function does things beforehand.Keep in mind that if your program is terminated by Task Manager, it won't have the chance to run any code at all.
The difficult we do right away... ...the impossible takes slightly longer.
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I'd like to have a piece of code executed upon definite end of a program.
atexit()is not appropriate because there may be some code executed when destructing static objects and this function does things beforehand.Just do what CPallini recommended. If you would do the same on linux then you could easily do the same trick with
fork()without using 2 binaries. -
I'd like to have a piece of code executed upon definite end of a program.
atexit()is not appropriate because there may be some code executed when destructing static objects and this function does things beforehand.CPallian gave a good idea. Maybe you can do this in other way. You can complete a dll for this. when a dll is detached, the branch named "DLL_PROCESS_DETACH" of Dllmain. yeah, it's your wanted place. :laugh: Nice to make friends with you !
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I'd like to have a piece of code executed upon definite end of a program.
atexit()is not appropriate because there may be some code executed when destructing static objects and this function does things beforehand.What about something like:
#include <...>
#include "..."class dummy
{
public:
dummy::dummy()
{
...code here is executed before main()
}dummy::~dummy() { ...code here is executed after main() }};
void main( void )
{
...do some stuff
}"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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What about something like:
#include <...>
#include "..."class dummy
{
public:
dummy::dummy()
{
...code here is executed before main()
}dummy::~dummy() { ...code here is executed after main() }};
void main( void )
{
...do some stuff
}"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
Perfect ideas, using the order of constructor of a object. But the question is how can you control this object is destructed behind the any other one? Nice to chat with you !
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Perfect ideas, using the order of constructor of a object. But the question is how can you control this object is destructed behind the any other one? Nice to chat with you !
Heng Xiangzhong wrote:
But the question is how can you control this object is destructed behind the any other one?
You can control it is constructed before
mainexecution (and destructed aftermainexecution) making it global, e.g.#include <iostream>
using namespace std;class A
{
public:
A(){cout << "A ctor" << endl;}
~A(){cout << "A dtor" << endl;}
};A a;
int main()
{
cout << "main" << endl;
}Veni, vidi, vici.
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Heng Xiangzhong wrote:
But the question is how can you control this object is destructed behind the any other one?
You can control it is constructed before
mainexecution (and destructed aftermainexecution) making it global, e.g.#include <iostream>
using namespace std;class A
{
public:
A(){cout << "A ctor" << endl;}
~A(){cout << "A dtor" << endl;}
};A a;
int main()
{
cout << "main" << endl;
}Veni, vidi, vici.
Yeah, you are right. It is all they can do. But it is too simple to complete the most situations. for example, i want execute a piece of code behind the all of objects' destruct function is invoked. if this, dll is a good way.
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Yeah, you are right. It is all they can do. But it is too simple to complete the most situations. for example, i want execute a piece of code behind the all of objects' destruct function is invoked. if this, dll is a good way.
Thanks for all replies. Anyway, the solution requires quite tricky programming.
Heng Xiangzhong wrote:
for example, i want execute a piece of code behind the all of objects' destruct function is invoked.
...and is right. I would say it looks much more difficult than using simple
atexit()function and I wonder why. Probably it belonged to early C standard libraries and no one invented anything better at C++ times. I'm not sure whether dll is a solution because the same question remains: if I'd like to execute some code after all static objects in dll are disposed, I'd come to the same point of interest. -
Thanks for all replies. Anyway, the solution requires quite tricky programming.
Heng Xiangzhong wrote:
for example, i want execute a piece of code behind the all of objects' destruct function is invoked.
...and is right. I would say it looks much more difficult than using simple
atexit()function and I wonder why. Probably it belonged to early C standard libraries and no one invented anything better at C++ times. I'm not sure whether dll is a solution because the same question remains: if I'd like to execute some code after all static objects in dll are disposed, I'd come to the same point of interest.Let met think. If you don't think it is complex, hook is a good solution for this. You can hook the ExitProcess API in win32 by inline, IAT or something you can do. Because a process exits in windows through invoke the ExitProcess by itself, so after CRT lib destructs all the objects, it will invoke ExitProcess, at that time, the control flow will give you a chance to execute your code. If you don't know how to complete it, I can give a piece of code that i wrote before. Nice to make friends with you ! My email, Henzox.7@gmail.com
