Please tell how to open a .exe file through fopen

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1.00/5 (3 votes)

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C++

fopen("temp.exe",r);

[Update]
i want to run exe within exe without system call

What I have tried:

exe file or executable file can be opened in c program when it is sure that its not the file that is in execution. i mean while a program named temp.exe is running n in that program another say text.exe file starts running

Posted 24-Mar-16 6:03am

Ravinder Singh

Updated 26-Mar-16 0:14am

Patrice T

v4

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Jochen Arndt 24-Mar-16 12:20pm

So what is your question?

Patrice T 26-Mar-16 4:20am

What do you mean by "open" ?
What do you want to do with it ?

Ravinder Singh 26-Mar-16 5:34am

i want to run exe within exe without system call

Alan N 26-Mar-16 6:19am

Just write your own operating system. Try it!

Ravinder Singh 26-Mar-16 7:50am

i will love to write but since i know for operaating system i must first have basic knowledge of asm (which i dont have) so i have to proceed with the tools i have

Jochen Arndt 26-Mar-16 6:25am

If you want to execute another program from your program, you have to call a function that does that. If you don't want to use system(), choose another call that provides similar behaviour. Examples are platform dependant functions like CreateProcess and ShellExecute for Windows.

If you need access to the output of the program use popen(). However, that will call system() internally.

Ravinder Singh 26-Mar-16 7:45am

my whole purpose is to execute a exe file without system call
even if i try to avoid system() in other cases also it will make a system call
plz provide me something that dont do system call

Jochen Arndt 26-Mar-16 8:21am

If you don't want to call any system function you have to write code similar to those used by the system (which finally might result in writing your own OS as alrewady mentioned).

To know how to do that you might take a look at the sources of FreeDOS at http://www.freedos.org/.

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Ravi Bhavnani · Answer 1 · 2016-03-24T06:31:00

Solution 1

I assume you mean "run" and not "open". If so, use CreateProcess[^].

/ravi

Posted 24-Mar-16 6:31am

Ravi Bhavnani

Comments

Ravinder Singh 26-Mar-16 2:34am

is there any other way. i mean without making any system call n without use of api

Ravi Bhavnani 26-Mar-16 10:51am

I assume you meant "without use of a Windows API". If so, you can use the system() function, but note it's not as efficient as using CreateProcess (on Windows). See https://msdn.microsoft.com/en-us/library/277bwbdz.aspx.

Ravinder Singh 27-Mar-16 3:54am

system() is a function of Dos.h header file and dos.h primarily check win32 API
and CreateProcess also does the same

Ravi Bhavnani 27-Mar-16 10:14am

Yes, I know. I was offering a syntactically simpler approach to starting an .exe from your app.

Patrice T · Answer 2 · 2016-03-26T00:14:00

Quote:
Please tell how to open a .exe file through fopen

fopen is used to read or write in a file, not to launch an executable.

Quote:
i want to run exe within exe without system call

There is no other way.
In fact there is another way: you just have to duplicate that system call.

[Update]

Quote:
there surely are some ways possible to do so because if there is no such way then our operating system will also not work its basic lie in this concept

The OS establish rules to prevent conflicts between programs running at same time. What you want to do simply break all those rules.
You can do it, but you have to find how.