How to convert a std::wstring to HWND
Carsten Unterberg
Hello,
I try to convert a given hwnd in a std::wstring into a real HWND.
At the moment, I try it like that:
std::wstring clienthwnd = L"87CAFD04"; //clienthwnd is OK
long longclienthwnd = (LONG)_wtol((TCHAR*)clienthwnd.c_str());
//longclienthwnd = '0x00000057'
HWND pclienthwnd = reinterpret_cast<HWND>(longclienthwnd); //pclienthwnd =
'0x00000057' => unused = ??? => HWND__**
How can I convert that?
Best regards,
Carsten Unterberg|Test-Framework
http://test-framework.blogspot.com/
r_z_...@pen_fact.com
<carsten....@googlemail.com> wrote:
>Hello,
>
>I try to convert a given hwnd in a std::wstring into a real HWND.
Are you sure you need/want to do this? If you tell us why, someone may
have a better solution.
>
>At the moment, I try it like that:
>
>std::wstring clienthwnd = L"87CAFD04"; //clienthwnd is OK
If your real code is going to hard code a string like this, then I
really wonder. If you're just doing this to provide a sample, then not
so strange.
>long longclienthwnd = (LONG)_wtol((TCHAR*)clienthwnd.c_str());
Casts are generally suspect. Casts involving character strings are
even worse. your use of (TCHAR *) here looks very suspicious. First
you set clienthwnd using a UNICODE constant string, then you extract
the string using a function that always returns a pointer to an ASCII
string. And then you cast to a TCHAR pointer, which can be UNICODE or
not depending on compiler settings; for Windows CE it is always
UNICODE. If you really this confused about UNICODE, I _strongly_
recommend taking time to understand it. Otherwise, you will waste a
lot of your time tracking down odd errors.
>//longclienthwnd = '0x00000057'
>HWND pclienthwnd = reinterpret_cast<HWND>(longclienthwnd); //pclienthwnd =
>'0x00000057' => unused = ??? => HWND__**
>
>How can I convert that?
>
>Best regards,
>
>Carsten Unterberg|Test-Framework
>http://test-framework.blogspot.com/
>
>
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Robert E. Zaret, eMVP
PenFact, Inc.
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Boston, MA 02116
www.penfact.com
Carsten Unterberg
thanks at first for that fast reply.
I think, I need it for my current project. I created a c++ application and a
.NetCF application. Both are communicated via Windows Messages.
I need the conversion from wstring to HWND in the c++ application to get
sure to have the correct .NetCF application on the backside, this, which
starts the c++ application. For sure, I could look with the FindWindow()
function for that .NetCF application, if there is more the application in
the processlist with "#NETCF_AGL_MSG_' as classname, I have got a problem.
S, I decided to walk the way with the parameter.
I hope, that make it better to understand.
Best regards,
Carsten
<r_z_aret@pen_fact.com> schrieb im Newsbeitrag
news:arcud55ubhc2oni9u...@4ax.com...
r_z_...@pen_fact.com
<carsten....@googlemail.com> wrote:
>hey,
>
>thanks at first for that fast reply.
>
>I think, I need it for my current project. I created a c++ application and a
>.NetCF application. Both are communicated via Windows Messages.
>
>I need the conversion from wstring to HWND in the c++ application to get
>sure to have the correct .NetCF application on the backside, this, which
>starts the c++ application.
How did you get the HWND that you stored in the string? Why not just
store the value as an HWND and compare it directly? I don't think you
can trust any HWND you store; I believe it changes every time a window
opens.
For sure, I could look with the FindWindow()
This is usually the right way to go. Particularly if the window has a
unique window class that you can use in the first argument to
FindWindow.
>function for that .NetCF application, if there is more the application in
>the processlist with "#NETCF_AGL_MSG_' as classname, I have got a problem.
If "#NETCF_AGL_MSG" is the windows class name (associated with a
window, not a C++ object), then FindWindow is pretty clearly the right
way to go.
GG
"Carsten Unterberg" <carsten....@googlemail.com> wrote in message
news:%23ocUnjl...@TK2MSFTNGP05.phx.gbl...
> Hello,
>
> I try to convert a given hwnd in a std::wstring into a real HWND.
>
> At the moment, I try it like that:
>
> std::wstring clienthwnd = L"87CAFD04"; //clienthwnd is OK
> long longclienthwnd = (LONG)_wtol((TCHAR*)clienthwnd.c_str());
> //longclienthwnd = '0x00000057'
> HWND pclienthwnd = reinterpret_cast<HWND>(longclienthwnd); //pclienthwnd =
> '0x00000057' => unused = ??? => HWND__**
>
HWND pclienthwnd = (HWND)_tcstoul(clienthwnd.c_str(), NULL, 16);
--
Giuseppe Govi
giuseppe.govi <> syncdata it