GTK+ Forums

thearunkumar · Familiar Face Joined: 09 Dec 2007 Posts: 6

In many functions, a variable of type gchar** is passed as a parameter and an array of strings get stored in it.. How do I access those strings?

Thank you..[/i]

thearunkumar · Familiar Face Joined: 09 Dec 2007 Posts: 6

I tried using g_strv_length() function, which I read in glib manual, to get the number of strings and used a 'for' loop to access each string. But the program crashes..

Code: (Plaintext)

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GtkWidget *prompt;
gchar **output;
gchar **error;
gint *return_v;
GError **m = NULL;
gboolean return_t;
gchar string_command;
gchar temp[200];
gint count = 0;
gint output_str = 0;

GtkWidget *text_view;
GtkTextBuffer *text_buffer;

return_t = g_spawn_command_line_sync(script_path,output,error,return_v,m);

text_view = lookup_widget(GTK_WIDGET(button),"tv");
text_buffer = gtk_text_view_get_buffer(GTK_WIDGET(text_view));
if(return_t)
{
output_str = g_strv_length(output);
for(count = 0; count < output_str; count++)
g_printf("\n%s",output[count]);
}
}

Micah Carrick · Posted: Wed Feb 13, 2008 1:57 pm Post subject:

Not tested but...

Code: (C)
1 2 3 4 5 6	gchar *fields; fields = g_strsplit ("one:two", ":", 0); if (fields == NULL \|\| fields[0] == NULL) return 0; g_debug("0=%s, 1=%s", fields[0], fields[1]); g_strfreev (fields); / free memory */

thearunkumar · Familiar Face Joined: 09 Dec 2007 Posts: 6

Thank you.. It works. I didn't use g_debug though.. it said undefined symbol. may be i have to include some headers. I used g_print instead. I am able to execute commands with g_spawn_command_line_sync it works. I wanted to change the directory from which the child process is spawned. So I used chdir(). It didn't work. So swithced to g_spawn_sync(), in which the first argument is "working directory of the child process". When I printed the output I get neither an error nor correct output..

This is the code that I used..

Code: (Plaintext)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24	gchar *argv; gchar output; gchar _stderr; gboolean t; GError error; argv = (gchar *)g_malloc(sizeof(gchar)*2); argv[0] = "/bin/ls"; argv[1] = NULL; t = g_spawn_sync(NULL,argv,NULL,G_SPAWN_FILE_AND_ARGV_ZERO\|G_SPAWN_SEARCH_PATH,NULL,NULL,&output,&_stderr,NULL,&error); if(t) { g_print("\n%s",_stderr); g_print("\n%s",output); } if(!t) { g_print("\n%s",error->message); }

I am getting just new lines printed.. What might be the bug? Thank you..

Micah Carrick · Posted: Thu Feb 14, 2008 3:43 pm Post subject:

The following works fine for me...

Code: (C)

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#include <glib-2.0/glib.h>

int main() {

gchar **argv;
gchar *output;
gchar *_stderr;
gboolean t;
GError *error;

argv = (gchar **)g_malloc(sizeof(gchar*)*2);
argv[0] = "/bin/ls";
argv[1] = NULL;
t = g_spawn_sync(NULL,argv,NULL,G_SPAWN_FILE_AND_ARGV_ZERO|G_SPAWN_SEARCH_PATH,NULL,NULL,&output,&_stderr,NULL,&error);
if(t)
{
g_print("\n%s",_stderr);
g_print("\n%s",output);

}
if(!t)
{
g_print("\n%s",error->message);
}
return 0 ;
}

However, there is not code in there to free memory (those strings, string array, and GError should all be freed when done).

What I get is two new lines and then the output of the ls command... which makes sense.

thearunkumar · Familiar Face Joined: 09 Dec 2007 Posts: 6

It didn't work for me.. Is it because I wrote it in one of the event handler functions in the file callbacks.c. I created a dialog box and had a command button in it. This was the callbacks.c I wrote for it. The handler for click event for the button "record" is

void
on_cb_record_clicked (GtkButton *button,
gpointer user_data)

It's is not displaying the ls becuase I have used it here?? I am confused.

Code: (Plaintext)

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# include <config.h>
#endif

#include <gtk/gtk.h>

#include "callbacks.h"
#include "interface.h"
#include "support.h"

void
on_cb_record_clicked (GtkButton *button,
gpointer user_data)
{
gchar **argv;
gchar *output;
gchar *_stderr;
gboolean t;
GError *error;

argv = (gchar **)g_malloc(sizeof(gchar*)*2);
argv[0] = "/bin/ls";
argv[1] = NULL;
t =
g_spawn_sync(NULL,argv,NULL,G_SPAWN_FILE_AND_ARGV_ZERO|G_SPAWN_SEARCH_PATH,NULL,NULL,&output,&_stderr,NULL,&error);
if(t)
{
g_print("\n%s",_stderr);
g_print("\n%s",output);

}
if(!t)
{
g_print("\n%s",error->message);
}
}

It's is not displaying the ls becuase I have used it here?? I am confused.