Using "argv" to pass image files C++

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Hello to you all. I am currently testing a program of image segmentation and need to somehow pass a test image file in the main program as shown below. Been searching for a while. I would appreciate an example of how to use or replace the "argv" with the test image file and consequently produce an output file. Much appreciate your guidance!

http://cs.brown.edu/~pff/segment/[^]

C++

int main(int argc, char **argv) {
  if (argc != 6) {
    fprintf(stderr, "usage: %s sigma k min input(ppm) output(ppm)\n", argv[0]);
    return 1;
  }
  
  float sigma = atof(argv[1]);
  float k = atof(argv[2]);
  int min_size = atoi(argv[3]);
	
  printf("loading input image.\n");
  image<rgb> *input = loadPPM(argv[4]);
	
  printf("processing\n");
  int num_ccs; 
  image<rgb> *seg = segment_image(input, sigma, k, min_size, &num_ccs); 
  savePPM(seg, argv[5]);

  printf("got %d components\n", num_ccs);
  printf("done! uff...thats hard work.\n");

  return 0;
}

Posted 26-Oct-15 11:03am

binaryoffset

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barneyman 26-Oct-15 17:26pm

argv[4] would be the *path* to the input file (ie /usr/binaryoffset/wibble.bmp), similarly argv[5] is the output *path*

barneyman 27-Oct-15 18:34pm

arg0 is automatically supplied by the startup code - you don't need to specify it

binaryoffset 27-Oct-15 18:37pm

Thank you. It's solved now and working. :)

Sergey Alexandrovich Kryukov 26-Oct-15 18:06pm

It makes sense at all. There is nothing to "search" for. Programming is done by writing code, not "searching". You have all you need. Your argv is nothing but array of string. A string can be a file name, some option, anything. "To use or replace the "argv"" is nothing but absurd. You just read those strings and do with them whatever you want.
—SA

binaryoffset 27-Oct-15 15:37pm

As much as I appreciate the information regarding an argv, there is no need for the criticism about "searching" for an example. I wouldn't have posted this if there wasn't a need, and I'm not the only one. Thanks again for your input.

Sergey Alexandrovich Kryukov 27-Oct-15 16:13pm

Well, this is what you think, but I disagree. What you thing you need to find can itself be a confusion, exactly like something you want to know. I still think that "nothing to search" is an essential advice, if you take it right, more important than the knowledge is missing. Instead of searching, you need to apply the information you already have logically, and derive what you need from that. I think I explained you how.

And you are very welcome.

—SA

[no name] 26-Oct-15 20:00pm

This question is really wasting other people's time. Have you made any effort to understand what the code does? Think about it - how did the author get a result without passing a file. Initiative is required here.
http://www.site.uottawa.ca/~lucia/courses/2131-05/labs/Lab3/CommandLineArguments.html

binaryoffset 27-Oct-15 15:40pm

Thank you for your input and 'time', though it seems 'wasted' for you. Many people will in fact appreciate the link given.
And yes, effort has been placed to understand what the code does. It's figured now.

Richard MacCutchan 27-Oct-15 11:37am

Question makes no sense. You already have all the code to do what you want, so you just call the program with the required parameters.

binaryoffset 27-Oct-15 17:57pm

Perhaps the question wasn't presented in a way that was clear to some people but there is no need for the abrupt judgement. Eventually, I figured to pass required information in Command Arguments (Configuration Properties > Debugging)-that's what I wanted to know, really. As you said, " just call the program with the required parameters".

Richard MacCutchan 28-Oct-15 4:28am

As I said the question makes no sense. What you were asking was how to set the parameters in Visual Studio in order to test a desktop application. What you presented gave us no clue that that was your issue.

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KarstenK · Accepted Answer · 2015-10-27T03:51:00

you must replace your inner main code with a function, so it looks like this:

C++

int main(int argc, char **argv) {
  myTestableFunction( argc, argv);

return 0;
}

and the myTestableFunction function you can use in your testcode. It should work like this

C++

void theTest
{
  int n = 6;
  char args[][] = {"","","","","",""};//some useful values
  //run test
   myTestableFunction(n, args);
  //check results  ...
}