Hello all:
I need to use ASCII character 0 as a spacer in a file becuase of the program that uses the file. I tried to use this code:
public subroutine f_writeFixedNumericField (integer outputfilehandle, String text, integer length);
int i,z
if Len( text ) > length then
FileWrite( outputfilehandle, Left( text, length ) )
else
FileWrite( outputfilehandle, text )
z = length - Len( text )
for i = 1 to z step 1
FileWrite( outputfilehandle, ToANSI( String( Char(0) ) ) )
next
end if
end subroutine
but to no avail. It seems to treat the Char(0) as undecipherable text and ignore it. Unfortunately, the program that will use the file insist on seeing the char(0) since it expects and ISAM format. I worte a program in java that will do it but I want to use power builder if possible becuase of the better GUI.
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I need to use the NULL character aka ASCII character 0. In notepad, the char shows up as a black square. Also, I wrote a utility that parses a file by the ACSII interger values of each character. After testing the output file from powerbuilder, I can see the NULL chars are not being writen. However, I think there is a way to get PowerBuilder to write these char 0 as spaces in this output file. ISAM format requires I use char 0 as the spacer and not ASCII 32.
Hi,
I don't think it is possible using the powerscript.. as filewrite help says : If any argument's value is NULL, FileWrite returns NULL. So it is not going to write any char(0).
Also I don't find any ways to initialize a blob with having embedded char(0)'s in it.
You may need to use some external API for file access. You can also use VB sript in PB. Check http://www.rgagnon.com/pbd
regards,
Vikas Dixit
Here is sample code that writes a single null character to a file. You can easily adapt this by just keeping the code that declares, sets and edits the bl_null_char. Note that I tried bl_null_char = Blob (Char (0)) but this created a zero length blob. I think blobedit is the only way to set a zero in a blob.
blob {1} bl_null_char
string ls_file_name
int li_file, li_ret
ls_file_name = sle_1.text
li_file = FileOpen (ls_file_name, StreamMode!, Write!, LockWrite!, Replace!)
if li_file = -1 then
MessageBox ('Open Error', 'Could not open file ' + ls_file_name)
return
end if
bl_null_char = Blob (String (1))
BlobEdit (bl_null_char, 1, Char (0))
li_ret = FileWrite (li_file, bl_null_char)
FileClose (li_file)
// li_ret should be 1
MessageBox ('Debug:', 'li_ret = ' + String (li_ret))
I know that you can place a char (0) at the end of a blob. I use the following code to change two arrays into name=value pairs that can be saved in the registry as a REG_MULTI_SZ: (Note that in this case, I rely on a "feature" of blobEdit that automatically adds the null char in for you.)
// build a blob containg the key value pairs, separated by a \x00.
blob{10240} lb
long ll_next, l, ll_max
string ls_pair
ll_next = 1
ll_max = upperBound (aas_keys)
for l = 1 to ll_max
ls_pair = Trim (aas_keys[l]) + '=' + Trim (aas_values[l])
ll_next = BlobEdit (lb, ll_next, ls_pair)
next
ll_next = BlobEdit (lb, ll_next, '') // ensure that there are two \x00 at the end
ll_next = BlobEdit (lb, ll_next, '')
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by: Vikas_DixitPosted on 2003-08-25 at 06:05:28ID: 9215838
Hi,
Please clarify, do you want to use '0' or char(0) ?
Char(0) will be Null and will not be displayed in the file if you open it in an editor.
Regards,
Vikas Dixit