On Mar 16, 4:10 pm, Benjamin Peterson <benja...@python.org> wrote:
> <wallenpb <at> gmail.com> writes:
>
>
>
> > self.out.write(b'BM') worked beautifully. Now I also have a similar
> > issue, for instance:
> > self.out.write("%c" % y) is also giving me the same error as the other
> > statement did.
> > I tried self.out.write(bytes("%c" %y),encoding=utf-8) in an attempt to
> > convert to bytes, which it did, but not binary. How do I affect
> > self.out.write("%c" % y) to write out as a binary byte steam? I also
> > tried self.out.write(b"%c" % y), but b was an illegal operator in when
> > used that way.
> > It is also supposed to be data being written to the .bmp file. --Bill
>
> Are you writing to sys.stdout? If so, use sys.stdout.buffer.write(b'some
> bytes'). If you're writing to a file, you have to open it in binary mode like
> this: open("someimage.bmp", "wb")
Yes, I am writing to a file. That portion is correct and goes like
this:
self.out=open(filename,"wb")
self.out.write(b"BM") # This line works thanks to advice
given in previous reply
However, here is some more code that is not working and the error it
gives:
def write_int(self,n):
str_out='%c%c%c%c' % ((n&255),(n>>8)&255,(n>>16)&255,(n>>24)&255)
self.out.write(str_out) #this is line 29, does not work - not
sure how to get this complex str converted over to binary bytes to
write to bmp file.
#tried to use self.out.write(bytes
("blah", encoding='utf-8')) type coding here. This way ran without
error, but
#did not write proper data to the .bmp
file.In hex editor it was obvious it was filling in wrong bits.
#Also tried self.out.write(b'%c%c%c%c' %
(blah)) but this gave errors for bad operands for % operator.
---------------------
Traceback (most recent call last):
File "C:\Python30\py_kohn_bmp.py", line 29, in write_int
self.out.write(str_out)
File "C:\Python30\lib\io.py", line 1038, in write
raise TypeError("can't write str to binary stream")
TypeError: can't write str to binary stream
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