How to use the standard output by Flash Air? - actionscript-3

Question

I want to make a command line tool by Flash Air, but there is not any api of AS3 to output content to standard output.
Then, I try to use ANE to solve my problem(By making a windows ane and use C's printf function to output content), but it doesn't work.
Is there any methods to use the standard output by Flash air, or to make a command line tool by Flash Air?
The code of dll written by c++ is:
FREObject add(FREContext ctx, void* functionData, uint32_t argc, FREObject argv[])
{
int32_t x,y;
FREGetObjectAsInt32(argv[0], &x);
FREGetObjectAsInt32(argv[1], &y);
int32_t result = x + y;
FREObject resObj;
FRENewObjectFromInt32(result, &resObj);
//I want to use the "printf" to print content to the console
printf("print by dll: the result is %d\n", result);
return resObj;
}

Answer 1

but there is not any api of AS3 to output content to standard output.
Only a running OS process can give back Standard Output (also called stdio in C).
The best you can do is create an app that looks like commandline tool but in reality it just runs & passes data to the actual (native) OS commandline tool. Meaning in your tool you capture the user command to a string and then run a nativeProcess involving that (parsed) string as your process arguments.
Example in your app user types : calc. Your AIR runs: c:\Windows\System32\calc.exe
Anyways, on to your real question...
I try to use C's printf function to output content, but it doesn't
work.
If you mean you made some test.exe with C and when you get AIR to run it you want to capture the printf output then you can try:
process.addEventListener(ProgressEvent.STANDARD_OUTPUT_DATA, CTest_OutputData);
or
process.addEventListener(ProgressEvent.STANDARD_ERROR_DATA, CTest_ErrorData);
To catch the output (it will be sent as bytes) make sure you have some public byteArray and String created. Here's an example for STANDARD_ERROR_DATA (it's likely the output goes here too, since you claim that STANDARD_OUTPUT_DATA is not working).
The code shown below inside that function works same whichever type of progressEvent you choose. Just put in the "right" one. temp_BA is the byteArray variable you setup earlier.
public function CTest_ErrorData (event:ProgressEvent):void
{
process.standardOutput.readBytes( temp_BA, temp_BA.length, process.standardOutput.bytesAvailable );
if ( temp_BA.length > 0 )
{
temp_String = temp_BA.readUTFBytes(temp_BA.length);
trace( "temp_String is : " + temp_String ); //if you want to check it
}
}
Final TIP: You can get traces inside Flash IDE by disabling "desktop" and keeping "extended desktop" ticked. Both must be ticked later when you make installing app.