7 replies to this topic

[Mumble]

Hi,

I want to create a message queue which takes input from stdin and saves it in a file. I am able to read input from message queue. But, I am unable to store this message in a file.

Can anyone tell how to save message from message queue into a file?

Thanks,
Mumble.

[Ancient Dragon]

We have no clue what a message queue is, so you will just have to post the code.

[dargueta]

This is my best guess as to what you want:

#include <stdio.h>
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.
.
char message[256];
scanf("%255s", message);
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.
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FILE *output = fopen("output_file_name.txt", "w");
fprintf(output, "%s", message);
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.
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fclose(output);

[geseeker]

I'm guessing you don't know how to write a file in C. In that case, you will want to refer to "file operations in C". Google it.

[Mumble]

Hi,

Thanks Dargueta.

I know how to write to a text file. But I am using message queue os IPC mechanism. And I ahve to read data from stdin into a message queue and from that message queue I have to write to a text file.

Do you have any idea how to read from message queue and then write to a text file?

Thanks,
Mumble.

[Groogy]

Can you explain what a message queue is? Like how we interface to it? Is it an array of strings or do we have functions to query for the messages, etc. etc.?

[Ancient Dragon]

I asked that question 2 days ago and he has not answered it yet. Since me mentioned IPC (inter process communications) maybe he is talking about pipes??? But that's just a guess.

[dargueta]

Can you get the information from the message queue into a buffer, like char mybuf[1024] or something?