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Using unicode strings in Comboxboxex  with  Win32 API C  problem

Posted on 2002-05-08
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Last Modified: 2013-12-03
Hello again, Experts!

I have a problem with the comboboxex using C Win32 API.

The comboboxex contains unicode strings (Chinese, Thai,Japanese,etc.)
Whenever I send CB_SELECTSTRING or CB_FINDSTRING to the comboboxex window with a unicode
string I get the index found as zero, even though there is a matching first character in the listbox(of the comboboxex).

Using a WCHAR buffer as destination, the strings extracted from the listbox(of comboboxex) with CB_GETSTRING are non-unicode!! Though the comboboxex displays the strings in its listbox as unicode!
Sending a CBEM_SETUNICODEFORMAT does nothing.

/////////////////
Example:
comboboxex listbox: (xxx denotes non-English characters)
---
 Chinese xxx  
 Japanese xxx
 ...
----
unicode string to find: "C"
-----------------
CB_SELECTSTRING/CB_FINDSTRING returns 0!!!
with WCHAR destination buffer, CB_GETLBTEXT returns non-unicode strings! The non-English characters become ??? in memory.
/////////////////

Are there preliminary steps needed before CB_SELECTSTRING/CB_FINDSTRING so that the comboboxex will return the right index?
Are there preliminary steps needed before CB_GETLBTEXT so that the comboboxex will return Unicode strings?
If so, what are they?

Any help / tips/ code are appreciated!! Thanks in advance!

Roland
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Question by:RolandAZ
8 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 6997262
>>I get the index found as zero

Actually, that's the correct behaviour/result when the string to find is at the 1st position (resembling index 0) - if nothing was found, you'd get CB_ERR, which is -1.
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Expert Comment

by:GGRUNDY
ID: 6997651
If you are using NT,2000 or XP
try calling SendMessageW instead of SendMessage - see if that helps.
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Author Comment

by:RolandAZ
ID: 6998561
jkr, GGUNDY,
Thanks for tips!

jkr,
it never returned CB_ERR, even if there is no matching string. :)

GGUNDY,
I'm using SendMessageW, but the CB_SELECTSTRING/CB_FINDSTRING/CB_GETSTRING still sees the strings as non-unicode.

--------------
I made a workaround by not using CB_SELECTSTRING/CB_FINDSTRING, but used CB_GETSTRING and MultiByteToWideChar the returned strings, and compared each one from the string to be searched.

But wish I could use the CB_SELECTSTRING/CB_FINDSTRING/CB_GETSTRING to work returned automatic unicode strings, though.


Thanks again , guys.
Roland



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LVL 1

Expert Comment

by:Yechezkel
ID: 6998856
Have you had a look at CBEM_SETUNICODEFORMAT?
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Author Comment

by:RolandAZ
ID: 6998921
Yechezkel,
Yup! But CBEM_SETUNICODEFORMAT doesn't seem to affect it.

Roland
P.S. CB_GETSTRING (in above comment) is macro for  CB_GETLBTEXT

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