Thread: How to pipe an image into another program's stdin?

So, there's this program called gocr that reads numbers and letters and it works great! But what I need it to do, is read a portion of an image, so I made my own program that extracts that portion and makes a new "image" (in the memory) out of it. Now, gocr can take an image from stdin instead of from a file (it says so in the man page), and I would like to use that option because it seems it would be a lot faster. But I don't know how to do this..

So what I need is to execute gocr from my program, pass a image from my struct to his stdin and set his argument to let him know to read it from the stdin (from terminal that argument would be gocr -i -), then read his stdout back into my program.

Oh, and... it's all running on Ubuntu, I dunno if that makes a difference..

How would I do that?

Originally Posted by tabstop

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Oh there's a function called pipe.. How appropriate Thank you.

And there is one more thing I have to do. How can I pass arguments to gocr from my program? As noted in my previous post, I need to send the -i argument (to let him know the image is coming up) and then a dash (because if the argument after -i was anything but a dash, it would be an image file name).

It's not really a function it's done by the | character at the command line, in your example I imagine you would do something like this:

Code:

./yourprogram ~/path/to/file | gocr -i -

Originally Posted by 3Nex

Oh there's a function called pipe.. How appropriate Thank you.

And there is one more thing I have to do. How can I pass arguments to gocr from my program? As noted in my previous post, I need to send the -i argument (to let him know the image is coming up) and then a dash (because if the argument after -i was anything but a dash, it would be an image file name).

So did you read "man exec" like you were supposed to?

Originally Posted by tabstop

So did you read "man exec" like you were supposed to?

Oh.. No, sorry.. Thx.. again.. I guess.. Reading up on stuff always gets me so confused that I forget other stuff I have to read.. Sometimes I google so much I forget what I was looking for..