Writing to files.

Not so much a bug as a caveat.

This demo uncovered a glitch:
runbasic.wikispaces.com/UploadAndMove

My first attempt at writing this code used a file opened for "output" to write filedata to a new file in a created folder. It worked okay for text files, but an attempt to write the data from a bmp file and from a wav file gave me an error:


unsupported character

The error went away when I attempted to write the data to a file opened for "binary." If files opened for output only work for text data, perhaps this should be documented.

Thank you Alyce.

I started working on the same thing last night, ran into the same problem then the power went out.

Power comes back on and the code is finished. Wish it always happened that way.

Thank you!

I have a jpg file which loads OK into a graphic using loadgraphic statement.
Copying the file, either opening for input/ouput or for binary results in a file which can not be loaded by loadgraphic, effectively leaving RB with no file copying facility.
The error message is 'Incompatible image. Marker C2 cannot be handled (possible unsupported progressive scan)'

Code used to copy:
file$="C:\rbp\webcamOFF.jpg"
open file$ for input as #f 'or binary
filedata$ = input$(#f, LOF(#f))
close #f
open "C:\rbp\webcam\webcamOFF.jpg" for output as #g 'or binary
print #g, filedata$ 'with or without semicolon
close #g



Mike

Mike,

Try this

open file$ for binary as #f


instead of

open file$ for input as #f 'or binary

maybe?

Dave,


Thanks, but I have tried both input/output and binary.

Mike

Mike,

I just used this and it worked here.

file$="C:\rbp\hi.jpg"
open file$ for binary as #f
filedata$ = input$(#f, LOF(#f))
close #f
open "C:\rbp\webcam\hi.jpg" for binary as #g 'or binary
print #g, filedata$ 'with or without semicolon
close #g

'Load the image
loadimage "banner", "hi.jpg"

'create a graphic object.
graphic #g, 420, 300

'draw the image in the graphic object.
#g drawimage("banner",0,0)

'display it on the web page
render #g


You are displaying the original image.
If you use relative, existing paths, anyone can run your snip, without modification.
The following uses PRINT with and without semicolon, an image included in the RBP installation and the temporary image folder, so it can be run on any RBP installation.
file$="mandelbrot.jpg"
open file$ for binary as #f
filedata$ = input$(#f, LOF(#f))
close #f
open "public\images\copy_test_0.jpg" for binary as #g 'or binary
print #g, filedata$ 'without semicolon
close #g
open "public\images\copy_test_1.jpg" for binary as #g 'or binary
print #g, filedata$; 'with semicolon
close #g

'Load the image
loadimage "banner", "public\images\copy_test_0.jpg"
loadimage "banner1", "public\images\copy_test_1.jpg"

'create a graphic object.
graphic #g, 400, 600

'draw the image in the graphic object.
#g drawimage("banner",0,0)
#g drawimage("banner1",0,300)

'display it on the web page
render #g
This example gives no errors and the images are displayed correctly.

OOPPS, I was opening the original file.

Made a change
Killed the original
opened the correct image
Now it works!

file$="C:\rbp\hi.jpg"
open file$ for binary as #f
filedata$ = input$(#f, LOF(#f))
close #f
open "C:\rbp\webcam\hi.jpg" for binary as #g
print #g, filedata$ 'with or without semicolon
close #g

kill file$

'Load the image
loadimage "banner", "C:\rbp\webcam\hi.jpg"

'create a graphic object.
graphic #g, 420, 300

'draw the image in the graphic object.
#g drawimage("banner",0,0)

'display it on the web page
render #g

Thanks everybody, but did you notice I was using loadgraphic not loadimage? ;)

After a fresh start today I realised the file I was copying was not the one intended. It was a progressive scan jpg - hence the error message was correct.

All's well now ... for now. ;D

Mike.