Hi Aitor,
As you can see, popen runs the command opening a pipe to trap its
textual output. shell_reader is a pointer to the actual output reader.
fgets reads the shell_reader line by line until it returns false. It
places lines in buffer using 1024 as a size limit in the quoted code
snippet. The read string in buffer is null terminated.
This should set you going.
Edward
On 06/12/2015, Edward Bartolo <edbarx@???> 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…
