QString and BSTR

kitten

hi to everyone
i have a c# dll that i use it via dumpcpp and active qt
it works correctly except when i call a function that uses BSTR that dumpcpp converted to QString
how can i solve this problem?
how can i convert qString to bstr?

cincirin

something like this ...
@
BSTR test = SysAllocString(QString::utf16());
// to do what you need with "test"
SysFreeString(test)
@

kitten

i want to set a Qstring variable to my Bstr and
i want to set a Bstr variable to my QString
can you give me example?

cincirin

[quote author="kitten" date="1316004185"]i want to set a Qstring variable to my Bstr[/quote]
previous example not work ? ... or some minimal compilable example would be ...
@
QString string("whatever string");
BSTR bstr = SysAllocString(string.utf16());
// to do what you need with "bstr"
SysFreeString(bstr);

@
[quote author="kitten" date="1316004185"]i want to set a Bstr variable to my QString [/quote]
QString string = QString::fromUtf16(yourBSTR);

kitten

thanks alot for your answer
but i use this code and it get me error
@ bool qax_result;
QString st("mil");
BSTR test = SysAllocString(st.utf16());
void _a[] = {(void)&qax_result, (void*)&Row, (void*)&Col, (void*)&test};
qt_metacall(QMetaObject::InvokeMetaMethod, 244, _a);
SysFreeString(test);
return qax_result;@
it is compiled successfully but when i run it, it get me error

giesbert

Hi kitten,

where do you get which error?
Did you try to debug it?

The conversion from QString to BSTR looks generally correct.

giesbert

By the way, do you need a BSTR*?
in the parameters, you write:

@
(void*)&test...
@

a BSTR is already a pointer....

kitten

i use this but it get me error again
@void _a[] = {(void)&qax_result, (void*)&Row, (void*)&Col, (void*)test};@
it get me error on this file
qatomic_windows.h
on function
@inline bool QBasicAtomicInt::ref()@

cincirin

I did a little test, and it works perfectly:
@
QString string("test");
BSTR bstr = SysAllocString(reinterpret_cast<const OLECHAR*>(string.utf16()));
char testing[] = {bstr[0], bstr[1], bstr[2], bstr[3], '\0'};
qDebug(testing);
SysFreeString(bstr);
@

debug window show "test"

cincirin

Just out of curiosity, if you delete last parameter(test) from _a array, the problem still exists ?

giesbert

[quote author="kitten" date="1316007780"]i use this but it get me error again
@void _a[] = {(void)&qax_result, (void*)&Row, (void*)&Col, (void*)test};@
it get me error on this file
qatomic_windows.h
on function

@
inline bool QBasicAtomicInt::ref()
@
[/quote]

Which error message do you get???

this is just a parameter assignement, nothing else

kitten

it work correctly
do you what i want to do?
i have a .net dll now i want to write a program for it
i use dumpcpp to use it , it works correctly and this functions work correctly too
but when i send a text of other languages like persian to this dll it show me ???? in replace of my text

kitten

!http://www.pic.iran-forum.ir/images/81rzhse7v2t3wujmtb1.jpg(error)!
[quote author="Gerolf" date="1316008510"][quote author="kitten" date="1316007780"]i use this but it get me error again
@void _a[] = {(void)&qax_result, (void*)&Row, (void*)&Col, (void*)test};@
it get me error on this file
qatomic_windows.h
on function
@inline bool QBasicAtomicInt::ref()@[/quote]

Which error message do you get???

this is just a parameter assignement, nothing else[/quote]

giesbert

which is the call stack?

kitten

what do you mean by call stack?

cincirin

In Visual Studio is: Debug -> Windows -> Call Stack

kitten

this is my call stack when i got error
!http://www.pic.iran-forum.ir/images/vpo7zgu8y0gdpbw6id4l.jpg(call stack)!

cincirin

[quote author="kitten" date="1316008652"]it work correctly
i use dumpcpp to use it , it works correctly and this functions work correctly too
but when i send a text of other languages like persian to this dll it show me ???? in replace of my text
[/quote]

What work correctly ? When your program crashes ?
Also for persian and arabic conversion, maybe "PAText wiki":http://developer.qt.nokia.com/wiki/QPlugs_PAText_Add_Persian_and_Arabic_support_to_WindowsCE_Mobile_applications will help you

kitten

it is generated with dumpcpp
if i use the default it work corrctly on english language
but in persian language it doesn't work correctly

giesbert

How do you enter persian text?
The shown call stack is too short, please copy it out of the call stack window and post it as text.