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Java Forum / General / January 2006Java String to LPCWSTR Question
How do you convert a jbyte* that i get from GetStringUTFChars in JNI to an LPCWSTR? >How do you convert a jbyte* that i get from GetStringUTFChars in JNI to >an LPCWSTR? look in the headers to find out what a jbyte* really is. Then it becomes a C problem.  SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > > How do you convert a jbyte* that i get from GetStringUTFChars in > > JNI to an LPCWSTR? > > look in the headers to find out what a jbyte* really is. Then it > becomes a C problem. Roedy, if you don't know the answer then don't just /guess/., The above is bad advice in several different ways. -- chris On 15 Jan 2006 10:06:51 GMT, "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> wrote, quoted or indirectly quoted someone who said : >Roedy, if you don't know the answer then don't just /guess/., The >above is bad advice in several different ways. If you think my answer is wrong. please give the right one, or at least explain how it was wrong. SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. What about TCHAR? Can i use that? > What about TCHAR? Can i use that? Please quote appropriately from the message to which you are replying. If your newsreader is so broken that it is difficult to do that (e.g. if you have been so mislead by Google as to suppose that Usenet is part of Google) then do it by hand or -- a far better idea -- get a proper newsreader. I do not normally reply to authors who cannot be bothered to learn, or are so clueless not to have noticed the existence of, basic Usenet etiquette. On this occasion, however, having got that off my chest, I may as well carry on and try to answer what I guess is your question. TCHAR is part of the MS infrastructure for hiding the difference between 8-bit characters and 16-bit characters. It's a bit of a hack (actually, it's a hack from bottom to top), but it does work moderately well. In this case you don't /want/ to hide the difference, since you are definitely working with 16-bit unsigned quantities so I suggest that using TCHAR is actively wrong since TCHAR can expand to char or wchar_t depending on the compilation environment. -- chris > How do you convert a jbyte* that i get from GetStringUTFChars in JNI to > an LPCWSTR? Two ways. One is to use the data from GetStringUTFChars(), which -- despite the name -- is /NOT/ in UTF-8 format, to build a new wide-string. To do that you'll have to look at the definition of the non-UTF-8 format in the JNI documentation. Tedious and easy to make mistakes, but not actually difficult. The other is to use the other API, GetStringChars() (if I remember the name correctly), instead. That will give you a sequence of 16-bit values in UTF-16 format, which is the same as that used by Windows, and (presumably) what you want your LPCWSTR to contain. Note that GetStringChars() does /not/ return null-terminated data. I /think/ that most uses of LPCWSTR expect the data to be null-terminated, but I'm not sure. -- chris Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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