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  1.  Home
  2. RPG400-L
  3. November 2005

Using printf in RPG and keeping the console open - again

Hi Simon,

On 20th October 2005 Simon Coulter wrote:

Long Answer:
Search the archives. Barbara Morris provided an explanation of why C and RPG behave differently in this respect. 

Short Answer:
Force the console to redisplay and wait by issuing a getchar() after you do the final printf(). 


Many apologies for not getting back to this sooner. However...
I used getchar() to force the redisplay and it all looks great and gorgeous. This is what I assumed would be needed, but just needed to check for better ways.
I couldn't find the explanation from Barbara on how things are different for RPG and C with respect to printf and the console. It's interesting though, because I get a very similar problem when running a C executable on my PC from two different environments. That is, if I open a DOS prompt and run the exe I can still see the output after the exe has completed. If I run the exe from within an IDE like DEV++ The DOS prompt window is opened, the exe is run and the window is closed - just like when I run a RPG program which uses printf. I can see that this happens is because the prompt window was opened for specifically running the exe in the latter case, and I can see that something similar must occur for running a RPG program on the iSeries which uses printf. What I can't see is why running a C program on the iSeries should behave differently in the respect of keeping the console open. I could understand it if the C program was run from within the console, like running it from an already open DOS prompt, but I can't understand why it would be different for two programs called from QCMD.
Or am I getting this completely wrong? Just curious, and thanks for your help. 

Cheers

Larry Ducie

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