COM Object Released But DLL Still In Memory - C / C++ / MFC Discussion Boards

shpid3r15-Jul-09 2:01

15-Jul-09 2:01

Hello!

I am using a C51 compiler for a microcontroller (so not visual studio)

I am trying to convert a long int variable to a char*, using C-specific functions (no atoi and the rest)

long Value="1234";
char String[15];
sprintf(String,"%d",Value);

This puts in "String" the value "0".

If I make Value of type integer, it works. What seems to be the problem ?
Are there any (other) functions to help me do this ?

Where can I find the source code for ltoa and the family, to declare it ?

Thanks,
Shpid3r

Re: Converto long to char []

C^hris L^osinger15-Jul-09 2:03

C^hris L^osinger

15-Jul-09 2:03

try:

sprintf(String,"%ld",Value);

(that's a lowercase "L" - for "long")

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Re: Converto long to char []

«_Superman_»15-Jul-09 2:10

«_Superman_»

15-Jul-09 2:10

shpid3r wrote:
using C-specific functions (no atoi and the rest)

atoi and the rest are all ANSI C functions.

«_Superman_»
I love work. It gives me something to do between weekends.

Re: Converto long to char []

Cedric Moonen15-Jul-09 2:11

Cedric Moonen

15-Jul-09 2:11

shpid3r wrote:
long Value="1234";

How does this even compile ? You are trying to assign a string (yes, "1234" is actually a string) to a long. You should at least get a warning here...
Try without the double quotes:

long Value = 1234;

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: Converto long to char []

shpid3r15-Jul-09 2:20

shpid3r

15-Jul-09 2:20

:ashamed of myself: $Shucks | :-\$
I didn`t paste the code, just reproduced it here, and in the hurry I put the quotes...
Of course it won`t compile with them Smile | :)

Great, %ld" works!
Thanks! I spent the last 3h trying to figure this out ... I should have asked sooner!

Regards!
Shpid3r

Re: Converto long to char []

Stuart Dootson15-Jul-09 4:16

Stuart Dootson

15-Jul-09 4:16

Just FYI - I'm guessing that (unlike VC++), the C51 compiler has 16-bit ints, which are smaller than longs? And that the C51 is a big-endian chip? WHich would explain the zero result.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Toolbar problem

Rakesh515-Jul-09 1:34

Rakesh5

15-Jul-09 1:34

Hi,

in my application was having double space after the toolbar..

i.e., after file menu, there is more gap to the main window.. where do we usually adjust this??

thanks,
rakesh

COM Object Released But DLL Still In Memory

Crazy Joe Devola15-Jul-09 0:41

Crazy Joe Devola

15-Jul-09 0:41

Hi,

I have a program that uses a COM object. At somepoint I try to release the object. After I do the release process, I can see using Process Explorer that the ActiveX DLL is still in memory.

My code is below. Am I doing something wrong? Why is the DLL still in memory?
ComReleaseTest.DLL is a test VB ActiveX DLL I wrote to debug this problem. It does nothing - all it has is one test sub which I am not even calling.

<br />
#include "stdafx.h"<br />
<br />
#import "..\ProductTree\winpos\drv32\ComReleaseTest.dll" no_namespace<br />
<br />
_CComReleaseTestPtr m_Srv;<br />
<br />
int Close();<br />
void ReleaseObject();<br />
<br />
int main(int argc, char* argv[])<br />
{<br />
	HRESULT hResult;<br />
<br />
	try<br />
	{	<br />
		if ( TRUE )<br />
		{<br />
			hResult = CoInitialize( NULL );<br />
<br />
			if ( hResult != S_OK )<br />
			{<br />
				return 1;<br />
			}<br />
		}<br />
<br />
		HRESULT hr = m_Srv.CreateInstance(__uuidof( CComReleaseTest ), NULL, CLSCTX_ALL);<br />
		if (FAILED(hr))<br />
			_com_issue_error(hr);<br />
    }<br />
	catch(_com_error& e)<br />
	{<br />
		return (1);<br />
    }<br />
<br />
	Close();<br />
<br />
	return (0);<br />
<br />
}<br />
<br />
int Close()<br />
{<br />
	long Result = 0;<br />
<br />
	if ( m_Srv != NULL )<br />
    {<br />
		TRY<br />
		{<br />
			ReleaseObject();<br />
		}<br />
		CATCH_ALL(e)<br />
		{<br />
			TCHAR sError[255];<br />
			e->GetErrorMessage(sError,255);<br />
		}<br />
		END_CATCH_ALL<br />
	}<br />
<br />
	return ( (short)Result );<br />
}<br />
<br />
<br />
<br />
void ReleaseObject()<br />
{<br />
<br />
	// Disconnect from VB ActiveX<br />
	try<br />
	{<br />
		m_Srv.Release();<br />
	}<br />
	catch(_com_error& e)<br />
	{<br />
	   //<br />
	}<br />
<br />
	free(m_Srv);<br />
	m_Srv.Detach();<br />
	<br />
<br />
	m_Srv = NULL;<br />
<br />
}<br />
<br />
<br />

The reason I am trying to track this is that I have anotehr program that at somepoint calls an InstallShield 5.5 setup. This setup.exe hangs at 99% and I found that if my program does not call a certain ActiveX then there is no problem with the setup.exe. So I am trying to release that ActiveX before calling setup.exe, but the COM DLL just stays in memory!

Re: COM Object Released But DLL Still In Memory

Stuart Dootson15-Jul-09 0:49

Stuart Dootson

15-Jul-09 0:49

yaron klodovski wrote:
Am I doing something wrong? Why is the DLL still in memory?

The DLL won't get unloaded just because you've disposed of all the objects you got from it. The DLL stays loaded in case you want to create more objects.

You could try using CoFreeUnusedLibraries[^] to unload the DLL (but be aware that CoFreeUnusedLibraries will only work instantly in single-threaded apartments[^].

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: COM Object Released But DLL Still In Memory

Crazy Joe Devola15-Jul-09 0:55

Crazy Joe Devola

15-Jul-09 0:55

Thank you very much. You are a genius! Problem solved. Smile | :)

adding an item into control panel context menu

emmmatty114-Jul-09 22:56

emmmatty1

14-Jul-09 22:56

Hi Friends,

I need to add a new item into the context menu we see while we right click on a control panel item and show a message box when user clicks on my item.I just want to display the name of the item on which the user right - clicked in the message box.

Any ideas?

Thanks and regards,
J

Re: adding an item into control panel context menu

«_Superman_»15-Jul-09 2:04

«_Superman_»

15-Jul-09 2:04

All control panel items are actually DLL files that end with a .CPL extension.
To add a menu item to its context menu, you need to create a shell extension.
Look at this tutorial here - The Complete Idiot's Guide to Writing Shell Extensions - Part I[^]

«_Superman_»
I love work. It gives me something to do between weekends.

unicode equivalent of Readfile() function..

Rakesh514-Jul-09 22:42

Rakesh5

14-Jul-09 22:42

Hi,

I am making my application unicode supporting one. i face a problem like this now :

i have got some content in *.inf file..

i am unable to read the content of the file using Readfile(..) function.

code snippet:
-----start-------------
TCHAR * inifilecontents;
HANDLE hFile = CreateFile( iniFilePath,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);

if (hFile != INVALID_HANDLE_VALUE)
{
DWORD nfile_Size = GetFileSize(hFile, NULL);
if (nfile_size != INVALID_FILE_SIZE)
{
m_nBufferSize = nFileSize + 1;
iniFileContents = new TCHAR[m_nBufferSize];
ZeroMemory(m_pIniFileContents, m_nBufferSize);
DWORD bytestoread = nFileSize;
DWORD bytesread = 0;
-----> BOOL bReadSucceeded = ReadFile(hFile,inifileContents,bytestoread,bytesread,NULL);

----------End---------------------
after executing readfile funcion, inifilecontents are showing contents as "some small BOXES" and not the exact content of inf file....
please guide me on this...

Thanks,
Rakesh

Re: unicode equivalent of Readfile() function..

Naveen14-Jul-09 22:55

Naveen

14-Jul-09 22:55

May be because your inf file isn't in unicode format. If so you have to read the content as char* itself and then convert it to unicode string using MultiByteToWideChar() function.

nave

[OpenedFileFinder] [My Blog]

Re: unicode equivalent of Readfile() function..

Rajesh R Subramanian14-Jul-09 22:57

Rajesh R Subramanian

14-Jul-09 22:57

Are you sure that you're compiling for Unicode?

It is a crappy thing, but it's life -^ Carlo Pallini

Re: unicode equivalent of Readfile() function..

Rakesh514-Jul-09 23:36

Rakesh5

14-Jul-09 23:36

Actually i dont have unicode content in the file as of now. but still its not showing even the ASCII content of the file..

when i tried CPallini' suggestion, it showed message box with boxes...

( that was the same thing as i tried earlier..)

Can u enlighten me what can i do for this?

Thanks,
Rakesh

Re: unicode equivalent of Readfile() function.. [modified]

Rajesh R Subramanian14-Jul-09 23:52

Rajesh R Subramanian

14-Jul-09 23:52

Well, what do you mean it's not "showing". Where are you trying to show it? An edit control? The debugger watch window? How exactly are you verifying the value of the buffer read?

BTW, this is pointless: m_nBufferSize = nFileSize + 1; Instead of 1, you must choose sizeof(TCHAR) if you want really neutral code.

[Added] Why are you reading a .inf file with ReadFile()?! WTF | :WTF:

Shouldn't be using the GetPrivateProfileString()[^] and other similar functions designed for this purpose?

It is a crappy thing, but it's life -^ Carlo Pallini

modified on Wednesday, July 15, 2009 5:58 AM

Re: unicode equivalent of Readfile() function..

CPallini14-Jul-09 23:09

CPallini

14-Jul-09 23:09

Rakesh5 wrote:
after executing readfile funcion, inifilecontents are showing contents as "some small BOXES" and not the exact content of inf file....

Actually that's the exact file content. Try to show it with, for instance

MessageBoxW(NULL, (LPCWSTR) inifilecontents, L"TEST", MB_OK);

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: unicode equivalent of Readfile() function..

Nishad S15-Jul-09 0:38

Nishad S

15-Jul-09 0:38

In short, using the ReadFile, will read the file content as bytes. Neither as unicode nor as MBCS, but simply as binary data. It is our concern whether it should be treated as unicode or not.

I am ignoring the inconsistency of the variables in your sample code. But still I found a mistake in your code.

That is you are allocating the buffer as 'new TCHAR[m_nBufferSize]'. It is wrong since the GetFileSize will return the exact size of the file in number of bytes. So when you are compiling with unicode enabled, the size of the TCHAR will be 2 (means sizeof unsigned short) and the buffer allocated will be twice of what we needed. Also it should be noted that the data read will not be directly converted to unicode (even if the buffer is of TCHAR).

And, from your question I understand that your file will be in unicode format. If this is true, then you can read it as follows. (modifications might be necessary)

int nSize = GetFileSize(...);
byte* pBytes = new byte[nSize];
ReadFile(..., pBytes, ...); // now the content of the file is in the buffer
MessageBox(.., LPCTSTR(pBytes), ... ); // you should make the buffer string null terminating if needed

This is the case when your file is in binary format.

When you save a file as unicode using notepad, you can see the first two bytes will be FF FE. So when you reading the file you can check that for ensuring the file is unicode and can ignore those bytes from using as data.

Suppose the content of a unicode file is 'abcd', then the binary equalent will be FF FE 61 00 62 00 63 00 64 00. You can see this when you open a file as binary in the VC editor itself.

I hope my explanation is clear for you.

(By the way, I am not sure about any APIs which will directly read a unicode file)

- ns ami -

what is IWshRuntimeLibrary?

V K 214-Jul-09 22:03

V K 2

14-Jul-09 22:03

what is IWshRuntimeLibrary? when can it be used.

Re: what is IWshRuntimeLibrary?

CPallini14-Jul-09 22:13

CPallini

14-Jul-09 22:13

May I politely google that for you [^]?
Big Grin | :-D

toolbar controls

Member 59031014-Jul-09 21:29

Member 590310

14-Jul-09 21:29

I have created an SDI application andi want to add two buttons to it for zoom in and zoom out.how can i do that?

Re: toolbar controls

_AnsHUMAN_ 14-Jul-09 21:38

_AnsHUMAN_

14-Jul-09 21:38

You want the buttons to be added to the toolbar. Right?

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

Re: toolbar controls

Stuart Dootson14-Jul-09 21:45

Stuart Dootson

14-Jul-09 21:45

Open the toolbar in the toolbar editor (double-click on the toolbar in the Resource View) and click on the blank button on the right side of the toolbar to create a new button. Type a suitable ID into the toolbar button's Properties view (something like ID_VIEW_ZOOMIN?). Now draw something on that to represent 'zoom-in' (a magnifying glass with a + usually works). Now repeat (but changing the details as appropriate) for the zoom-out button.

Now you can handle the zoom-in and zoom-out events, probably in your View class.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: toolbar controls

Member 59031014-Jul-09 23:58

Member 590310

14-Jul-09 23:58

thanks a lot

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