Hi Aitor,
I think, the fgets outside the loop is not required. I think it can be
done this way:
#include <stdio.h>
main()
{
FILE * fp;
char str[1024];
fp = popen ("/usr/lib/netman/bin/backend 6", "r");
if (fp == NULL) return -1;
while (!feof (fp))
{
fgets (str, 1024, fp);
printf ("%s", str);
}
pclose (fp);
return 0;
}
The reasoning behind my version:
If file fp is 0 in length feof(fp) should return true (non zero) which
means the loop does not start. if fp is not zero in length the loop
starts, fgets reads the first line and printf print it to the screen.
This continues until feof(fp) returns non zero (true).
Edward
On 09/12/2015, aitor_czr <aitor_czr@???> wrote:
> Hi Edward,
>
> The following code reads line by line the textual output of 'backend 6':
>
> #include <stdio.h>
>
> main()
> {
> FILE * fp;
> char str[1024];
>
> fp = popen ("/usr/lib/netman/bin/backend 6", "r");
>
> if (fp == NULL) return -1;
>
> fgets (str, 1024, fp);
> while (!feof (fp))
> {
> printf ("%s", str);
> fgets (str, 1024, fp);
> }
> pclose (fp);
> return 0;
> }
>
> I will have a look at your code.
>
> Thanks,
>
> Aitor.
>
> On 06/12/15 08:40, Edward Bartolo wrote:
>> Hi Aitor,
>>
>> The best way for you is to use the backend's code for reference. What
>> you want is already implemented there. TProcesss was used to trap the
>> background cli commands output although there are instances where that
>> output is discarded.
>>
>> What you need is this from the CLI backend's code (core_functions.c):
>> [ code snippet from getDefaultDevices() ]
>>
>> FILE * shell_reader;
>> char scan_buffer[1024];
>>
>> [...]
>>
>> shell_reader = popen(command, "r");
>> if(!shell_reader) {
>> fprintf(
>> stderr,
>> "ERROR: getDefaultDevices(): "
>> "popen() failed (Error: %s)\n",
>> strerror(errno)
>> );
>>
>> return -1;
>> }
>>
>> char* ptr;
>> while((fgets(scan_buffer, 1024, shell_reader))) {
>> ptr = (char*) scan_buffer;
>> if (strstr((char *) scan_buffer, "lo") == ptr)
>> continue;
>> else if (strstr((char *) scan_buffer, "wl") == ptr) {
>> snprintf(
>> _wl,
>> 1024,
>> "%s",
>> (char*) scan_buffer
>> );
>> } else if (
>> strstr((char *) scan_buffer, "eth") == ptr ||
>> strstr((char *) scan_buffer, "en") == ptr
>> ) {
>> snprintf(
>> _eth,
>> 1024,
>> "%s",
>> (char*) scan_buffer
>> );
>> }
>> }
>>
>> pclose(shell_reader);
>>
>>
>> Ask again if you in the event you may need more help.
>>
>>
>> Edward
>>
>>
>> On 05/12/2015, aitor_czr<aitor_czr@???> wrote:
>>> >Hi Edward,
>>> >
>>> >I'm trying to scan the existing connections. As i can see in the
>>> >TForm1.btnLoadExistingClick(Sender: TObject) method, you used
>>> > 'TProcess'
>>> >for running external applications. In C this must be replaced by the
>>> >'system' command.
>>> >
>>> >Now i'm looking at the TProcess options. For example:
>>> >
>>> > Proc.Executable := 'cat';
>>> > Proc.Parameters.Add('/etc/network/interfaces');
>>> > Proc.Options := [poUsePipes, poWaitOnExit];
>>> > Proc.Execute;
>>> >
>>> >Here are the definitions:
>>> >
>>> >http://olympiad.cs.uct.ac.za/docs/fpc-2.4.4/fcl/process/tprocess.options.html
>>> >
>>> >Cheers,
>>> >
>>> > Aitor.
>>> >
>>> >On 12/04/2015 01:00 PM, Edward Bartolo<edbarx@???> wrote:
>>>> >>Hi Aitor,
>>>> >>
>>>> >>I succeeded to run my trial gtk3 application with events without
>>>> >>errors. I always wanted to learn coding GUI applications for Linux in
>>>> >>C/C++. This can be a good exercise.
>>>> >>
>>>> >>Edward
>>>> >>
>>>> >>
>>>> >>On 02/12/2015, aitor_czr<aitor_czr@???> wrote:
>>>>>> >>> >Woow !!
>>>>>> >>> >
>>>>>> >>> >On 02/12/15 12:08, Edward Bartolo wrote:
>>>>>>>> >>>> >>priv = (Private*) g_malloc (sizeof (struct _Private));
>
>
::
Re: [DNG]
gcc error: "error: unknow…
