Hello.

do someone have any sample showing how I can use SystemTags function to execute a cli program from my C application ?
Same for FileInfoBlock. I need to use it to get a file creation date & last changes date.

Can someone help please ?

Thank you.

Regards,

@AmiDARK

/*
**	RunCmd V1.0 
**		Launches Asyncronously a shell command, while retaining 
**		all the console output in a listbrowser.
**
**	Dependencies:
**		Exec,DOS,Utility,Intuition,ListBrowser,(Layout?)
**
**	Should be Fully Reentrant,(I HOPE) no global data is used.
**
**	Inputs:
**		Name:	Name of the command to launch
**		Out:		ListBrowser nodes list
**		Gad:		ListBrowser gadget pointer
**		Win:		ListBrowser Window pointer
**	Retuns:
**		Nothing.
**	TODO:
**		Maybe returning some error codes
**		Modify error output
*/

#include "includes.h"

void RunCmd(CONST_STRPTR Name,struct List *Out,struct Gadget *Gad,struct Window *Win)
{
	BOOL				done = FALSE;
	BPTR				InPipe,
						OutPipe;
	LONG				num;
	STRPTR				Buffer;
	struct Node			*node;
	struct FReadLineData	*frld;


	if((OutPipe = IDOS->Open("PIPE:CmdOut", MODE_NEWFILE)))
	{
		if (IDOS->SystemTags(Name,
					SYS_Input,	NULL,
					SYS_Output,	OutPipe,
					SYS_Error,	OutPipe,
					SYS_Asynch,	TRUE,
					TAG_END)!=-1)
		{
			if ((InPipe = IDOS->Open("PIPE:CmdOut", MODE_OLDFILE)))
			{

				while ((done == FALSE))
				{
					if((frld = IDOS->AllocDosObject(DOS_FREADLINEDATA,TAG_DONE)))
					{
						num = IDOS->FReadLine(InPipe,frld);
						if((num > 0))
						{
							if((Buffer = IExec->AllocVec(frld->frld_LineLength,MEMF_ANY)))
							{
								IUtility->Strlcpy(Buffer,frld->frld_Line,frld->frld_LineLength);
								node = IListBrowser->AllocListBrowserNode(1,
											LBNCA_CopyText, TRUE,
											LBNCA_Text,Buffer,
											TAG_DONE);
								if(node)
								{
									IIntuition->SetGadgetAttrs(Gad,Win,NULL,
												LISTBROWSER_Labels, ~0,
												TAG_DONE);
									IExec->AddTail(Out,node);
									IIntuition->SetGadgetAttrs(Gad,Win,NULL,
												LISTBROWSER_Labels, Out,
												LISTBROWSER_MakeVisible,node,
												TAG_DONE);
								}
								IExec->FreeVec(Buffer);
							}
						}
						IDOS->FreeDosObject(DOS_FREADLINEDATA,frld);
						if((num Close(InPipe);
			}
			else
				IDOS->Printf("RunCmd::Failed to open input\n");
		}
		else
			IDOS->Printf("RunCmd::Failed to load command\n");
	}
	else
		IDOS->Printf("RunCmd::Failed to open output\n");
}

Last edited by Ami603 on 16-Jul-2012 at 09:28 PM.

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@Ami603

use the "pri" tag to get source code to look nice

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@NutsAboutAmiga

Care to show the syntax? thank you.

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@Ami603

<pre>

    Source code goes here

Last edited by broadblues on 16-Jul-2012 at 09:08 PM.

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@broadblues

Thank you very much.

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Thank you for the answer(s) :)

I will check all this.

Regards,
AmiDARK

@AmiDARK

As for FileInfoBlock, have a look at IDOS->ExamineObjectTags()

i think it will be more future-proof than FIB stuff.

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@AmiDARK

It is easy:

struct FileInfoBlock fib;
BPTR lock = Lock(filename, ACCESS_READ);

if (lock)
{
   Examine(lock, &fib);
   UnLock(lock);
}

Last edited by itix on 17-Jul-2012 at 08:24 AM.

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@AmiDARK

In OS4Depot you might find a tutorial (from me) about some DOS functions, called DosTutorials.lha. Example 2 and 3 make use of the ExamineObjectTags() function. Maybe it is of interest to you.

OldFart

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@itix

In OS4 the use of Examine() is deprecated in favour of ExamineDosObject().
Quote:

Examine -- Examine a directory or file associated with a lock ( DEPRECATED - use ExamineObject() from V52+ )

OldFart

EDIT: Corrected sloppy spelling as 'deprecated' has an 'e' and not a 'i' in 5th position...

Last edited by OldFart on 17-Jul-2012 at 08:54 AM.

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@OldFart

In MorphOS Examine() is still valid and there is even Examine64() variant to get more information from a lock.

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@Ami603
Quote:

if((OutPipe = IDOS->Open("PIPE:CmdOut", MODE_NEWFILE)))

Maybe it's there but I don't see "OutPipe" being closed anywhere in your code before it exits.

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@AmiDARK
Ami603's IDOS->SystemTags() example looks O.K. except I would use something like:

SYS_Input, Open("nil:", MODE_NEWFILE),

for the Input filehandle. In async mode the i/o filehandles will be closed when the process ends and I don't know if defining SYS_Input as NULL will prevent AmigaDOS from closing the parent process input filehandle. I've never found any specific mention of supplying NULL as a filehandle in the documentation so I play it safe and supply a filehandle to NIL: for async processes.

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@itix

The stack may be aligned but using it for system structures is not the proper way of doing it. AllocDosObject() is. Which also avoids relying on the hardware for any such features.

@OldFart

They don't want us using using functions like CreateMsgPort() wither. But I don't see why, it is a clean function. After all, I've seen it approved to use input.device still when commodiies.library should do the job but somehow can't. Using input.device goes back to the real Amiga 1.3 days. So I see no problem using an "old" function that does the job and is future proof.

@Hypex

AmigaOS has no restrictions on using stack space to store data (like neither have MorphOS or AROS).

Consider following example:

   TEXT buf[500];
   struct FileInfoBlock *fib = (APTR)&buf;

   stccpy(buf, "PROGDIR:", sizeof(buf));
   AddPart(buf, "Image.png", sizeof(buf));  // Buf is passed to dos.library
   fh = Open(buf, MODE_OLDFILE);            // Again buf is passed to dos.library
   ExamineFH(fh, &fib);                                 // Yet again same buf is passed to dos.library
   Close(fh);

void CreateQPort(struct MsgPort *port)
{
	port->mp_Node.ln_Type = NT_MSGPORT;
	port->mp_Flags        = PA_SIGNAL;
	if ((BYTE) (port->mp_SigBit = AllocSignal(-1)) == -1)
	{
		port->mp_SigBit = SIGB_SINGLE;
		SetSignal(0, SIGF_SINGLE);
	}
	port->mp_SigTask      = FindTask(NULL);  // SysBase->ThisTask would be faster here
	NEWLIST(&port->mp_MsgList);
}

void DeleteQPort(struct MsgPort *port)
{
	if (port->mp_SigBit == SIGB_SINGLE)
	{
		SetSignal(0, SIGF_SINGLE);
	}
	else
	{
		FreeSignal(port->mp_SigBit);
	}
}

Last edited by itix on 17-Jul-2012 at 04:35 PM.
Last edited by itix on 17-Jul-2012 at 04:32 PM.
Last edited by itix on 17-Jul-2012 at 04:30 PM.

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@Ami603

This line is dangerous

     Buffer = Iexec->AllocVec(frld->frld_LineLength,MEMF_ANY)

    Buffer = Iexec->AllocVec(frld->frld_LineLength+1,MEMF_ANY)

Last edited by NutsAboutAmiga on 17-Jul-2012 at 04:32 PM.

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@itix

Quote:

itix wrote: @OldFart In MorphOS Examine() is still valid and there is even Examine64() variant to get more information from a lock.

Examine does not report correct file size if file is more then 2Gb or 4gb, don't remember the max size atm.

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@NutsAboutAmiga

Examine64() will report correct size. But he was not asking about file size but file date.

And really, this DOS64 support on Amiga is most of time unused. There are only few applications requiring large file support.

Last edited by itix on 17-Jul-2012 at 04:57 PM.

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