C / C++ / MFC

21-Jan-05 0:10

Hi all,

I'm trying my first unicode application. Now I have the problem how to convert from CString (the unicode variant) to std::string.

Anyone has a hint?

Thanks,

Patrik

Mircea Puiu21-Jan-05 0:32

Mircea Puiu

21-Jan-05 0:32

Have a look here:
http://weblogs.asp.net/slippman/archive/2004/06/02/147090.aspx[^]

SkyWalker

Patrik Mueller21-Jan-05 0:53

21-Jan-05 0:53

Hi,

thanks for the link - but I'm still a VC6 user ;-(
Do you have a better idea??

Thanks,

Patrik

Mircea Puiu21-Jan-05 1:09

Mircea Puiu

21-Jan-05 1:09

First of all:
1) CString --> this is a string wrapper class, which is part of the Microsoft Foundation Classes(MFC).
2) std::string --> this is a Standard C++ Class wrapping a char string. It is part of the Standard Template Library, or STL.

The conversions between them are:

<br />
CString cs("Your text");<br />
std::string s((LPCTSTR)cs);<br />
<br />
std::string s("Your text");<br />
CString cs(s.c_str());<br />

SkyWalker

Patrik Mueller21-Jan-05 1:24

21-Jan-05 1:24

Thats clear - but try that within an unicode environment!

my last idea was that:

std::string result;
int i;
char *pmb = (char *)malloc( sizeof( char ) );

for (int j = 0; j < theString.GetLength()+1; j++)
{

i = wctomb( pmb, theString.GetAt(j) );
if (i != 1 && i != -1)
result.append(pmb);
}

But no success ;-(

Mircea Puiu21-Jan-05 1:38

Mircea Puiu

21-Jan-05 1:38

Try to use ANSI-To-UNICODE and UNICODE-TO-ANSI string conversions:

   <br />
char *ansistr = "Your text";<br />
int a = lstrlenA(ansistr) + 1;<br />
BSTR unicodestr = SysAllocStringLen(NULL, 2*a);<br />
MultiByteToWideChar(CP_ACP, 0, ansistr, a, unicodestr, a);<br />
// Do something with your string, for example<br />
AfxMessageBox(CString(unicodestr), MB_OK, 0); :-)<br />
// Free the BSTR<br />
SysFreeString(unicodestr);<br />

and

<br />
BSTR unicodestr;<br />
// Get you string somehow<br />
SomeFunction(unicodestr);<br />
int a = SysStringLen(unicodestr) + 1;<br />
char *ansistr = new char[a];<br />
WideCharToMultiByte(CP_ACP, 0, unicodestr, -1, ansistr, a, NULL, NULL);<br />
// Do something with your string, for example<br />
AfxMessageBox(ansistr, MB_OK, 0); <br />
// Free the memory after using the strin<br />
delete[] ansistr;<br />
SysFreeString(unicodestr);<br />

SkyWalker

Maximilien21-Jan-05 2:50

Maximilien

21-Jan-05 2:50

The unicode version of std::string is std::wstring; conversion should be straightforward.

or if you really need to use std::string, I think someone answered that already.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Emilio Garavaglia21-Jan-05 3:33

Emilio Garavaglia

21-Jan-05 3:33

CString is based on TCHAR that is #define-ed as char or wchar_t depending if ANSI or unicode.

std::string is ANSI, std::wstring is unicode.
They are typedef-s for std::basic_string<char> and std::basic_string<wchar_t> respectively.

It can be probably intresting -to reproduce TCHAR adaption- to use something like

namespace std {
   typedef basic_string<TCHAR> tstring;
}

and then, use

std::tstring<code><br />
 <br />
<br />
<small><br />
2 bugs found.<br />
> recompile ...<br />
65534 bugs found.<br />
:doh:<br />
</small>

Patrik Mueller21-Jan-05 20:07

Re: Creating a HDROP object

21-Jan-05 20:07

Hi all,

Now I've got a working solution...

Thanks for all your help!!!!!

Patrik

Creating a HDROP object

peluquero8020-Jan-05 23:55

peluquero80

20-Jan-05 23:55

Anyone knows how to create, having an array of files, a HDROP object in C?
All the documentation points to COM paradigm but no documentation available under MSDN for implementing this in C.

Thank you all
Marco

Blake Miller21-Jan-05 8:45

Blake Miller

21-Jan-05 8:45

First call DragAcceptFiles to activate D&D messages to your window.

Then respond to WM_DROPFILES - wParam has the HDROP

Call DragQueryFile and/or DragQueryPoint to obtain file names.

Then call DragFinish when you are done with the memory that the HDROP references.

Re: Creating a HDROP object

peluquero8023-Jan-05 23:23

peluquero80

23-Jan-05 23:23

Ok, thank you. Now my application accepts dragged files, but can't still create my own objects to drop to the shell and/or to other applications.
The only remaining question is now <<ho to="" creating="" a="" sinthetic="" hdrop="" object="" by="" choosing="" your="" own="" files="" append="" into="" clipboard?="">>
I mean, if my app had to create its own file, by "FileWriting" a stream, at the end of the ops, how it would set a synthesized object into Global Memory such to be accessed by other apps?
Is it just the same as copying a DIB or a WAVE, allocating global memory, locking and writing first some structure signature like BITMAPINFO and then the whole buffer containing zero terminated strings?

Thank you,

Marco

Re: Creating a HDROP object

Blake Miller25-Jan-05 4:47

Blake Miller

25-Jan-05 4:47

The ClipBoard is different from HDROP.

Data in the clipboard is in one (or more) of several standard formats or else in a proprietary format of your own choosing. I do believe you need to allocate memory specially for object data placed into the clipboard.

For Drag and Drop support of your own objects, you need to use COM - read about the IDropSource and IDropTarget interfaces.

The IDropSource interface is one of the interfaces you implement to provide drag-and-drop operations in your application. It contains methods used in any application used as a data source in a drag-and-drop operation. The IDropTarget interface is one of the interfaces you implement to provide drag-and-drop operations in your application. It contains methods used in any application that can be a target for data during a drag-and-drop operation.

Hot to get the handle of the main window?

Vaibhav Sanghavi20-Jan-05 23:54

Vaibhav Sanghavi

20-Jan-05 23:54

Hi All,

I am launching an exe using CreatProcess. I have handle and ID of launched process and its main thread. I want the handle to its main window. How do I?

One way is through EnumThreadWindows(), which will get me all window handles for the main thread. But how do I know which one is the main window handle?

Any other aproach?

--------------
Vaibhav...

vikramlinux21-Jan-05 0:56

vikramlinux

21-Jan-05 0:56

Hie,
The term "Main Window" is a bit confusing.I think u should think in terms of main parent window or the window whose parent is either NULL or desktop.I think there is no way to detect it thr enumwindows. Better u should check for caption of window or might be windwos style...or desktop as parent or NULL parent...

vvs

Abhi Lahare21-Jan-05 0:59

Abhi Lahare

21-Jan-05 0:59

Use EnumWindows first to iterate through all top level windows and then use GetWindowThreadProcessId() to find the windows that belongs to process.

Regards
Abhi Lahare

Blake Miller21-Jan-05 8:49

Blake Miller

21-Jan-05 8:49

Generally, the top level window of the app is the one without any parent, or its parent is the desktop.

Or has has been mentioned, call EnumDesktopWindows and use GetWindowThreadProcessId until you find one (or more) windows matching the process and thread id you already have.