Force a thread to execute an APC? - C / C++ / MFC Discussion Boards

minkowski23-Jul-07 4:53

23-Jul-07 4:53

Hi

I am trying to convert a long to a CString so that I can concatanate it as shown below

<br />
	CString tmpMsg = "New CAMA Saved. CAMA ID = " +  static_cast<CString>(m_NumericCAID.GetValue());<br />
<br />

where

<br />
m_NumericCAID.GetValue()<br />

returns a long. However I get compile errors. Any ideas on how to convert? Thanks.

Re: convert long -> CString

Nibu babu thomas23-Jul-07 5:05

Nibu babu thomas

23-Jul-07 5:05

minkowski wrote:
I am trying to convert a long to a CString so that I can concatanate it as shown below

CString csLongAsString;
long lSomeLongValue = 100L;
csLongAsString.Format( _T( "Long as string: %ld" ), lSomeLongValue );
AfxMessageBox( csLongAsString )

Nibu thomas
A Developer

Code must be written to be read, not by the compiler, but by another human being.

http:\\nibuthomas.wordpress.com

Re: convert long -> CString

led mike23-Jul-07 5:07

led mike

23-Jul-07 5:07

look at CString::Format(...)

what is the meaning of the L in _bstr_t(L"ROOT\\CIMV2")?

teohs23-Jul-07 4:49

teohs

23-Jul-07 4:49

Hi all,

I would like to ask a superby newbie question...what is the meaning of the "L" in the _bstr_t(L"ROOT\\CIMV2")? I tried search for the answer but nothing seems to work out. And I would greatly appreciate if anyone would show me a path to find out how many methods I could input besides "ROOT\\CIMV2".

Thank you.

Regards,
Beginner
Hengshi

Re: what is the meaning of the L in _bstr_t(L"ROOT\\CIMV2")?

Rage23-Jul-07 4:54

Rage

23-Jul-07 4:54

It states that the string is in UNICODE format. Same as _T("ROOT\\CIMV2"), if this is more telling.

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Re: what is the meaning of the L in _bstr_t(L"ROOT\\CIMV2")?

teohs23-Jul-07 5:05

teohs

23-Jul-07 5:05

hey thanx for the fast response, but is there any webbies which I can refer to for the letters and wordings?

Re: what is the meaning of the L in _bstr_t(L"ROOT\\CIMV2")?

David Crow23-Jul-07 5:09

David Crow

23-Jul-07 5:09

teohs wrote:
I would like to ask a superby newbie question...what is the meaning of the "L" in the _bstr_t(L"ROOT\\CIMV2")?

See here.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Force a thread to execute an APC?

alex.lavoro.propio23-Jul-07 3:56

alex.lavoro.propio

23-Jul-07 3:56

Hello,

I want to queue a user APC to a thread in the other running process (code injection issue resolved), but it is never executed. I guess the problem is the thread never enter the alertable state. How can I force it to enter the alertable state and executed my queued APC?

However, if I create that foreign process with CREATE_SUSPEND, queue the APC to the primary thread, resume it, the APC will be executed as expected.

I know it's unusual because it's not the designed purpose of APC. The preempted thread may be in a unstable state when executing APC.

I know it can be done easily in the kernel mode, but I am looking for a userland solution. Maybe using some native APIs in NTDLL.DLL, but I've not got any luck.

(1)
SuspendThread(hThread);
QueueUserAPC(apcFunc, hThread, NULL);
NtAlertResumeThread(hThread, &suspendCount);

(2)
QueueUserAPC(apcFunc, hThread, NULL);
NtAlertThread(hThread);

Neither of the above two method works. Do I miss something?

API for UNICODE

sandeepkavade23-Jul-07 3:41

sandeepkavade

23-Jul-07 3:41

hi all,
is there any api to check whether the file contains unicode, utf-8 or ansi characters?

Re: API for UNICODE

Abhijeet Pathak23-Jul-07 3:52

Abhijeet Pathak

23-Jul-07 3:52

IsTextUnicode() function can be used to check if the text is unicode...

The following code might help you:

<br />
int IsUnicodeFile(char* szFileName)<br />
{<br />
    FILE *fpUnicode;<br />
    char l_szCharBuffer[80];<br />
<br />
    //Open the file<br />
    if((fpUnicode= fopen(szFileName,"r")) == NULL)<br />
    return 0; //Unable to open file<br />
<br />
    if(!feof(fpUnicode))<br />
    {<br />
        fread(l_szCharBuffer,80,1,fpUnicode);<br />
        fclose(fpUnicode);<br />
        if(IsTextUnicode(l_szCharBuffer,80,NULL))<br />
        {<br />
            return 2; //Text is Unicode<br />
        }<br />
        else<br />
        {<br />
            return 1; //Text is ASCII<br />
        }<br />
    }<br />
    return 0; // Some error happened<br />
}<br />

Re: API for UNICODE

Nibu babu thomas23-Jul-07 4:03

Nibu babu thomas

23-Jul-07 4:03

sandeepkavade wrote:
is there any api to check whether the file contains unicode, utf-8 or ansi characters?

First few bytes of a file determine the nature of a file...

If the first three bytes of a file are EF, BB and BF, the file is a UTF-8 file.
If the first two bytes are FE and FF, the file is a Unicode file.

Nibu thomas
A Developer

Code must be written to be read, not by the compiler, but by another human being.

http:\\nibuthomas.wordpress.com

Re: API for UNICODE

sandeepkavade23-Jul-07 4:36

sandeepkavade

23-Jul-07 4:36

hi thomas
i am very new to VC++. it would be really thankful if you could tell me what is this EF, BB and BF. and how to determine them?
Thanx in advance.

Re: API for UNICODE

Rage23-Jul-07 4:56

Rage

23-Jul-07 4:56

These are hex numbers : 0xEF = 239, 0xBB= 187, ... Simply read these bytes from the file header and compare them to these numbers.

http://www.readytogiveup.com/[^] - Do something special today.
http://www.totalcoaching.ca/[^] - Give me some feedback about this site !

Re: API for UNICODE

Nemanja Trifunovic23-Jul-07 4:48

Nemanja Trifunovic

23-Jul-07 4:48

Nibu babu thomas wrote:
First few bytes of a file determine the nature of a file...

If the first three bytes of a file are EF, BB and BF, the file is a UTF-8 file.
If the first two bytes are FE and FF, the file is a Unicode file.

That's not a reliable way to determine whether a file contains Unicode.

UTF-8 is not required to start with a byte-order mark, and files with UTF-16LE and UTF-16BE encodings are actually forbiden to start with it.

Programming Blog
utf8-cpp

Re: API for UNICODE

Ralf Lohmueller15-Aug-07 17:18

Ralf Lohmueller

15-Aug-07 17:18

Nemanja Trifunovic wrote:
UTF-8 is not required to start with a byte-order mark, and files with UTF-16LE and UTF-16BE encodings are actually forbiden to start with it.

Sorry, why UTF-16(little/big endian) are actually forbidden?

Real time directory listing

KirkNarine23-Jul-07 3:21

KirkNarine

23-Jul-07 3:21

I'm trying to generate a directory listing of all the files in a specific directory as files are sent to it. Files are sent to this directory on a regular basis and each file needs to be listed with it's date created attribute. I can't just check by name to see if the file already exist in the list because I'm also checking for duplicates. Can anyone help me at least with how a real-time search coding in C++ will look like?
Thanks

Re: Real time directory listing

Anurag Gandhi23-Jul-07 3:29

Anurag Gandhi

23-Jul-07 3:29

Can you please clear out what exactly u want.

Anurag Gandhi.
http://www.softgandhi.co.nr

Re: Real time directory listing

KirkNarine23-Jul-07 4:11

KirkNarine

23-Jul-07 4:11

I need to know how you will list the files in a directory as the files are added in C++

Re: Real time directory listing

David Crow23-Jul-07 3:32

David Crow

23-Jul-07 3:32

Monitor the folder using either ReadDirectoryChangesW() or FindFirstChangeNotification().

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Real time directory listing

KirkNarine23-Jul-07 4:13

KirkNarine

23-Jul-07 4:13

What is the best way to list a directory in C++. I've heard of using boost libraries. Any suggestions or comments?

Re: Real time directory listing

David Crow23-Jul-07 4:20

David Crow

23-Jul-07 4:20

KirkNarine wrote:
What is the best way...

I guess that all depends on your viewpoint (i.e., what's best for you may not be for others, and vice versa).

KirkNarine wrote:
I've heard of using boost libraries. Any suggestions or comments?

Technically, C++ has no knowledge of folders and other file-system related things. I'm not familar with Boost so any comments would be unjust. In any case, check out _findfirst() and _findnext().

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Real time directory listing

Abhijeet Pathak23-Jul-07 3:36

Abhijeet Pathak

23-Jul-07 3:36

SHChangeNotifyRegister() function can be used if you want to receive notifications when something in shell namespace is changed... (e.g. file/folder creation, deletion, rename etc..)

take a look at http://www.codeproject.com/atl/shellfoldertree.asp, it may help you...

http://vbnet.mvps.org/index.html?code/shell/shchangenotify.htm : this is a Visual Basic sample... it might help you...
Smile | :)

Re: Real time directory listing

KirkNarine23-Jul-07 4:14

KirkNarine

23-Jul-07 4:14

Any suggestion on listing a directory in C++. I've heard of boost libraries, any comments on it?

Re: Real time directory listing

Abhijeet Pathak23-Jul-07 4:19

Abhijeet Pathak

23-Jul-07 4:19

Yes, the following article on CP shows how to use Boost libraries for directory listing:
http://www.codeproject.com/useritems/find_file.asp

and the following one shows how to do the same without using Boost libraries i.e. by using Win32 API functions like FindFirstFile() etc.
http://www.codeproject.com/cpp/recursedir.asp

And, I guess, the second method would be best, because it will eliminate dependencies on Boost libraries as it uses core API functions.

Smile | :)

Re: Real time directory listing

KirkNarine23-Jul-07 4:25

KirkNarine

23-Jul-07 4:25

Thanks, you've been a huge help. This is just what I needed

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