BSTR question? - C / C++ / MFC Discussion Boards

Jonas Larsson4-Sep-03 4:21

4-Sep-03 4:21

Assuming you have a function called Contains that takes an array of strings, you could write it like this: (note: I havent compiled or tested it)

typedef std::vector<std::string> string_row;
typedef std::vector<string_row> string_matrix;
bool Contains (const string_row& lookupTable, const std::string& value, bool ignoreCase); 

bool Contains (const string_matrix& lookupTable, const std::string& value, bool ignoreCase)
{
	int i = value.length();
	if ( i <= 0 || i-1 >= lookupTable.size() )
		return false;

	const string_row& strs = lookupTable[i-1];
        // not sure what you want here (do you have null ref's in c#???)
	if (strs.size() == 0) 
		return false;
	else
		return Contains(strs, value, ignoreCase);		

}

“Our solar system is Jupiter and a bunch of junk” - Charley Lineweaver 2002

Is this a homework assignment?

JWood5-Sep-03 3:43

JWood

5-Sep-03 3:43

This looks like a homework assignment for a CS course.

Help!!!

jimsleon3-Sep-03 18:54

jimsleon

3-Sep-03 18:54

How can I get the process's ID when I have got the process's HANDLE?
Thanks

Re: Help!!!

Magnus Westin3-Sep-03 21:20

Magnus Westin

3-Sep-03 21:20

in Windows XP sp1 and Windows server 2003 you can call GetProcessId.

But for the other, I dont think there is a documented way of doing that. You might be able to doing with some kernel call, but Im not sure. If there is a way, search Google under microsoft.public.win32.programmer.kernel

Magnus

Re: Help!!!

Dudi Avramov4-Sep-03 0:59

Dudi Avramov

4-Sep-03 0:59

Check this and in CodeGuru

Re: Help!!!

Dudi Avramov3-Sep-03 22:58

Dudi Avramov

3-Sep-03 22:58

Check this and in CodeGuru

dll and installation?

theCapt3-Sep-03 18:12

theCapt

3-Sep-03 18:12

ei how do u make an installation of an application.. I have coded a DLL using ATL COM Appwizard with MFC support..... Now, my dll is used in another VB Application.. now i want to make the VB application installable to other computers.. so how do i know which dlls will be added to my installation file aside from my own dll?... and since its using MFC support what MFC dlls will i include?

BSTR question?

theCapt3-Sep-03 18:06

theCapt

3-Sep-03 18:06

hi! i'm making a dll from ATL COM appwizard...
and then one of the properties there is of type BSTR....
now the BSTR type is stored internally by class with LPWSTR member...
now when i'm setting that BSTR i just equate it... i.e.

 STDMETHODIMP CBluetooth::put_ServiceName(BSTR newVal)<br />
{<br />
   // TODO: Add your implementation code here<br />
	m_sLPWSTRString = newVal;<br />
	<br />
	return S_OK;<br />
}<br />

assuming that newVal = "The String"...

when this function exits it seems m_sLPWString is now pointing to a garbage string.. (not the string "The String"..as seen in a debugger).... the address is the same but the contents of the address seems to be altered so whats the problem here...?

I can't use the CString functions since i'm avoiding the use of MFC....
actually when i used the COM from a program in Visual Basic it seems to work fine.. but when i used it from VB .NET thats were the problem comes in....

Re: BSTR question?

TrickyFishy3-Sep-03 18:48

TrickyFishy

3-Sep-03 18:48

It is because the BSTR that is being passed to you is not owned by you, that is the memory for it was not allocated by you. That's what I mean by you don't own it.

The caller is passing you a BSTR and then freeing it which is why your LPWSTR is now pointing at garbage.

To fix this, you need to allocate some memory that is pointed at by your LPWSTR then copy the contents of the BSTR to your new memory.

Since you appear to be using ATL, why not just use a CComBSTR instead of the LPWSTR? The overhead is minimal and it will take care of the memory allocation and freeing.

Here are both examples:

// don't forget to free this mem in FinalRelease or something
DWORD ccb = ::SysStringByteLen(newVal);
m_sLPWSTRString = (LPWSTR)HeapAlloc(GetProcessHeap(), 0, ccb);
CopyMemory(m_sLPWSTRString, newVal, ccb);

OR

// in you .h file
CComBSTR m_bsServiceName;

// in your .cpp file
STDMETHODIMP CBluetooth::put_ServiceName(BSTR newVal)
{
// CComBSTR takes care of both allocation and
// memory copy and will also free itself on destruction
m_bsServiceName = newVal;

return S_OK;
}

Re: BSTR question?

Braulio Dez3-Sep-03 23:56

Braulio Dez

3-Sep-03 23:56

Hi,

BSTR's are a real nightmare, I think what could work is:

<br />
   m_sLPWSTRString = newVal.Copy();<br />
   // OOps ! Sorry, I think you should call a special function<br />
   // that makes the copy for the BSTR..<br />

( or something ilke that), just forget about handling BSTR, just use "_bstr_t" or "CComBSTR", but take care with that as well..., personally I preffer _bstr_t since it allows you to convert from char * to BSTR, a good working code couldbe

<br />
  _bstr_t m_sLPWSTRString;<br />
  m_sLPWSTRString = newVal;  // It makes a copy for you<br />

Good luck
Braulio

CFormView + CDialogBar ??????

kumaru_san3-Sep-03 18:00

kumaru_san

3-Sep-03 18:00

Hello

I have one dilaog bar in my CFormView.

I have embbeded some buttons on my dilog bar.

I have to change the views based on the button selection
from the user.

For example if the user presses button1 from the dialog bar..
I want to diaply another formview with different dialog bar,

for button1...
CFormView1+CDialogBar1

for button 2 ..

CFormView2 + CDialogBar2 ..

for button3...

CFormView3+CDialogBar3

etc...

how to do this?
any idea or code snippets please!!!

"They can because they think they can" - Voltaire

TTFTODXF

wow99993-Sep-03 17:14

wow9999

3-Sep-03 17:14

HI THERE

Where can I find a Program, which include source code, or any information for converting TTF to DXF?

Thanks

Re: TTFTODXF

Iain Clarke, Warrior Programmer3-Sep-03 22:41

Iain Clarke, Warrior Programmer

3-Sep-03 22:41

There is information on this site (and elsewhere) about the DXF format.

You can use ::GetGlyphOutline to retrieve the line segments of a particular character.

Putting the two bits of information and some hard work, you'll have your answer.
You never know, there might just be an article in it somewhere!

Iain.

How do i pass data to a view from an independent class?

Member 4048133-Sep-03 15:13

Member 404813

3-Sep-03 15:13

Hi,

does anyone know the proper way to pass data from one independent class to a view within SDI?

thanks...
OMG | :OMG:

Where to put the menu handler in multi-view SDI application?

Binayak3-Sep-03 13:48

Binayak

3-Sep-03 13:48

Hi,

In my SDI application I have two Formviews separated by a splitter window. I want users to use the MainMenu (File->Save As etc) to display data etc which depends on both the Views.
For the two views do I need to write the same menu handlers in both the view classes, or, there is better place to put the menu handlers? I can't put it in the document class, as I'll show some popup dialog etc, which are not supported by document class.

Please advise

Re: Where to put the menu handler in multi-view SDI application?

John M. Drescher3-Sep-03 14:15

John M. Drescher

3-Sep-03 14:15

Binayak wrote:
I can't put it in the document class, as I'll show some popup dialog etc, which are not supported by document class.

Confused | :confused:

You can popup a dialog class from the document with no problem...

John

Re: Where to put the menu handler in multi-view SDI application?

Binayak3-Sep-03 14:18

Binayak

3-Sep-03 14:18

I tried to use the following and got error!! which says can't convert CDoc* to CWnd*

CFileDialog fileDlg(FALSE,"xml", NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, "XML Files(*.xml)|*.xml||", this );
fileDlg.m_ofn.lpstrTitle = "Save As";

Re: Where to put the menu handler in multi-view SDI application?

John M. Drescher3-Sep-03 15:53

John M. Drescher

3-Sep-03 15:53

Instead of this use either NULL or AfxGetMainWnd()

John

where will I find dbgheap.c etc

Member 5314143-Sep-03 13:45

Member 531414

3-Sep-03 13:45

We have some runtime errors and DevSudio
trys to find dbgheap.c. It isn't on my
machine, or anybody elses here either.
Where can we get dbgheap.c and the
other runtime debug files?

Re: where will I find dbgheap.c etc

Brad Sokol3-Sep-03 14:42

Brad Sokol

3-Sep-03 14:42

It's part of the C run-time library source.

This is not installed by default with Visual C++ 6. If installed, it is in \Program Files\Microsoft Visual Studio\VC98\CRT\SRC. If not installed, just re-run the installer and install the C run-time source as an additional component.

For Visual C++ 7.x, it's in \Program Files\Microsoft Visual Studio .NET\Vc7\crt\src or \Program Files\Microsoft Visual Studio .NET 2003\Vc7\crt\src, depending which version you have installed. I can't remember if it's installed as part of the default setup or if you have to drill into the install options to select it.

Brad

output file in VC++

mr20033-Sep-03 11:05

mr2003

3-Sep-03 11:05

Hi, I am trying to get a few parameters in an output file.
i have included fsteam.h, and iostream.h

my code is:

ofstream out("output.txt");
CMyDoc* pDoc = GetDocument();

out<<"12454 ";
out<<pdoc->X_Position<<"\n";
out<<"y: ";
out<<pdoc->Y_Position<<"\n";
out<<"z: ";
out<<pdoc->Z_Position<<"\n";

the code makes the output file, but its always empty,,
any siggestions?

Ehsan Behboudi

Re: output file in VC++

Hosam Aly Mahmoud3-Sep-03 11:37

Hosam Aly Mahmoud

3-Sep-03 11:37

1) When is the file empty? Do you check while your program is running or afterwards?
2) Make sure you have out.close(); after you finish. This is to make sure everything is output on the file.

Hosam Aly Mahmoud

Re: output file in VC++

Abin3-Sep-03 22:53

Abin

3-Sep-03 22:53

First, the contents may be output to some file else if you use relative path like that, you better use absolute path to make sure the destination file is exactly which you expected. So type this instead:
ofstream out("C:\\output.txt");.

Second, you need to exam the stream first to make sure the destination file is ready to be written, so add this line right after you open it:
ASSERT(out != NULL);

Third, always close a opened file as soon as you are done with it, add this line at the end:
out.close();

I have a strong feeling that your problem was caused by the first issue, you probably will find "output.txt" in your "My Document" folder, lol.

Hyperlink

Turtle Hand3-Sep-03 10:44

Turtle Hand

3-Sep-03 10:44

trying to pass a Hyperlink, part of msword9.h

function prototype:
BOOL WriteHyperlinkToExcel(CString sFileName, Hyperlink hyp);

error:
error C2061: syntax error : identifier 'Hyperlink'

i can create and use a Hyperlink inside a function without errors:
BOOL CHyperlinkApp::WriteHyperlinkToExcel(CString sFileName)
{
Hyperlink hyp;
CString strTemp = hyp.GetAddress();

return TRUE;
}

any thoughts?

<signature>
Josef Wainz
Software Developer

Re: Hyperlink

Jason Henderson3-Sep-03 19:04

Jason Henderson

3-Sep-03 19:04

Is msword9.h included in your .cpp file rather than the .h file?

Jason Henderson

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