C / C++ / MFC

Re: File enumeration performance (GetFirstFile)

23-Sep-06 8:18

FindFirstFileEx allows you to use these options:

typedef enum _FINDEX_SEARCH_OPS
{
  FindExSearchNameMatch,
  FindExSearchLimitToDirectories,
  FindExSearchLimitToDevices
} FINDEX_SEARCH_OPS;

MSDN docs also state that these options are advisory only, meaning that the function could ignore it. Your mileage may vary. Smile | :)

Requirements
Client: Requires Windows XP, Windows 2000 Professional, or Windows NT Workstation 4.0.
Server: Requires Windows Server 2003, Windows 2000 Server, or Windows NT Server 4.0.
Header: Declared in Winbase.h; include Windows.h.

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Mohammad A Gdeisat23-Sep-06 8:25

Mohammad A Gdeisat

23-Sep-06 8:25

Unfortunately, I am targeting windows mobile devices... so, it wont work

Thanks alot

And ever has it been that love knows not its own depth until the hour of separation

Re: File enumeration performance (GetFirstFile)

Jörgen Sigvardsson23-Sep-06 8:26

23-Sep-06 8:26

Bummer.

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Problem with getchar();

EzraYap23-Sep-06 5:27

EzraYap

23-Sep-06 5:27

	<br />
while ((ch = getchar()) !=EOF && isdigit(ch)){<br />
	result = result *10 + ch - '0';<br />
}<br />
printf("number is %d\n", result);<br />

i wonder what is '0' means. Is it is null character? Confused | :confused:

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ThatsAlok23-Sep-06 5:53

ThatsAlok

23-Sep-06 5:53

EzraYap wrote:
result = result *10 + ch - '0';

actually it's not null.. actually it is ascii based calculation.. i.e. '0' ascii value is 41 , '1' will 42 and so on.. so it way of extracting number from char character ... thats logic here

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EzraYap23-Sep-06 6:04

EzraYap

23-Sep-06 6:04

Thanks.

i undestand now.

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Jörgen Sigvardsson23-Sep-06 8:14

23-Sep-06 8:14

ThatsAlok wrote:
thats logic here

The only logical thing to say would be arithmetic Wink | ;)

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What wrong with this Code ?? ( multiThread in win32 )

ThatsAlok23-Sep-06 8:40

ThatsAlok

23-Sep-06 8:40

Jörgen Sigvardsson wrote:

The only logical thing to say would be arithmetic

he he he

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Yanshof23-Sep-06 5:11

Re: What wrong with this Code ?? ( multiThread in win32 )

23-Sep-06 5:11

Hi All.

I start to learn multiThread and i wrote some simple program.
I dont know why i crash - i try to look into by using debug and i dont see nothing wrong.

IF someone can tell me what i doing in wrong way .... ? Confused | :confused:

Thanks for any help.

Here the code :

<br />
...<br />
...<br />
 <br />
using namespace std;<br />
<br />
CRITICAL_SECTION sc;<br />
<br />
void __stdcall func(LPVOID param)<br />
{<br />
	char szBuffer[256];<br />
	{<br />
		EnterCriticalSection(&sc);<br />
		long lVal = *((long*)param);<br />
		<br />
		<br />
		while(lVal > 0)<br />
		{<br />
			sprintf(szBuffer, "lVal is : %ld \n", lVal--);<br />
			printf(szBuffer);<br />
		}<br />
		LeaveCriticalSection(&sc);<br />
	}<br />
}<br />
<br />
<br />
void main(void)<br />
{<br />
	HANDLE thread1,thread2;<br />
<br />
	long lVal = 10;<br />
<br />
	thread1 = CreateThread(NULL,<br />
						   5,<br />
						   (LPTHREAD_START_ROUTINE)func,<br />
						   &lVal,<br />
						   CREATE_SUSPENDED,<br />
						   NULL);<br />
<br />
	SetThreadPriority(thread1, THREAD_PRIORITY_HIGHEST);<br />
<br />
	lVal = 1000;<br />
	<br />
	thread2 = CreateThread(NULL,<br />
						   5,<br />
						  (LPTHREAD_START_ROUTINE)func,<br />
						  &lVal,<br />
						  CREATE_SUSPENDED,<br />
						  NULL);<br />
<br />
	SetThreadPriority(thread2, THREAD_PRIORITY_HIGHEST);<br />
<br />
	ResumeThread(thread2);<br />
	ResumeThread(thread1);<br />
	<br />
	WaitForSingleObject(thread2, INFINITE);<br />
	WaitForSingleObject(thread1, INFINITE);<br />
}<br />

Mohammad A Gdeisat23-Sep-06 6:04

Mohammad A Gdeisat

23-Sep-06 6:04

maybe you have a deadlock, plz check ur algorithm before u check ur code..

And ever has it been that love knows not its own depth until the hour of separation

Re: What wrong with this Code ?? ( multiThread in win32 )

Yanshof23-Sep-06 6:08

Re: What wrong with this Code ?? ( multiThread in win32 )

23-Sep-06 6:08

I don't have deadlock. and the algorithm is fine.

In case deadlock the application will not crash -
If i init the critical section ( in first line of the main i do InitializeCriticalSection(&sc); ) then i avoid the crash but i still see that the second thread get into the critical area even that the first thread is in it.

What wrong in the code ?

Yanshof23-Sep-06 8:16

Re: What wrong with this Code ?? ( multiThread in win32 )

23-Sep-06 8:16

I realy need some help here.

Hamid_RT23-Sep-06 8:33

Hamid_RT

23-Sep-06 8:33

It seems your problem is EnterCriticalSection

WhiteSky

Re: What wrong with this Code ?? ( multiThread in win32 )

Eytukan23-Sep-06 8:40

Eytukan

23-Sep-06 8:40

You missed this one buddy :
InitializeCriticalSection(&cs);
Dont you need to initialize it before you could enter into it?

Add it here:

<br />
char szBuffer[256];<br />
{<br />
InitializeCriticalSection(&cs)------->Here<br />
EnterCriticalSection(&sc);<br />
long lVal = *((long*)param);<br />

Good Luck

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Re: What wrong with this Code ?? ( multiThread in win32 )

Yanshof23-Sep-06 8:58

Re: What wrong with this Code ?? ( multiThread in win32 )

23-Sep-06 8:58

First of all ... the init of he critical section is need to be in the main and not in the function ( i dont want each of the thread the init it each time it start to run).

Second ... even if i call init in the main i have problem to run the second thread ( its just dont run ).

Eytukan23-Sep-06 9:35

Eytukan

23-Sep-06 9:35

Oops didn't read the program fully.CS should be initialized once. Try this.

<br />
#include <conio.h><br />
<br />
using namespace std;<br />
<br />
CRITICAL_SECTION sc;<br />
<br />
void __stdcall func(LPVOID param)<br />
{<br />
	AfxMessageBox("in thread");<br />
	char szBuffer[256];<br />
	long lVal = (*(long*)param);<br />
	EnterCriticalSection(&sc);<br />
<br />
	CString cs;<br />
	cs.Format("%d",lVal);<br />
	AfxMessageBox(cs);<br />
	<br />
	int testVal=lVal;<br />
	while(lVal > 0)<br />
	{<br />
	sprintf(szBuffer, "I'm %d lVal is : %ld \n",testVal,lVal--);<br />
	printf(szBuffer);<br />
	}<br />
	<br />
	LeaveCriticalSection(&sc);<br />
AfxMessageBox("done");	<br />
}<br />
<br />
<br />
void main(void)<br />
{<br />
HANDLE thread1,thread2;<br />
<br />
long lVal = 5000;// changed to test<br />
	InitializeCriticalSection(&sc);<br />
thread1 = CreateThread(NULL,5,(LPTHREAD_START_ROUTINE)func,&lVal,CREATE_SUSPENDED,NULL);<br />
<br />
<br />
SetThreadPriority(thread1, THREAD_PRIORITY_HIGHEST);<br />
<br />
long lVal2 = 1000; // changed to test<br />
<br />
thread2 = CreateThread(NULL,5,(LPTHREAD_START_ROUTINE)func,&lVal2,CREATE_SUSPENDED,NULL);<br />
<br />
SetThreadPriority(thread2, THREAD_PRIORITY_HIGHEST);<br />
<br />
ResumeThread(thread1); Sleep(3000); // changed to test<br />
ResumeThread(thread2);<br />
<br />
WaitForSingleObject(thread2, 500); // changed to test<br />
WaitForSingleObject(thread1, 500); // changed to test<br />
while(getch()!=27); // changed to test<br />
}<br />

Just did this one for test. Try it and tell me if it's useful or not. It's too late here .. see u tomorrow.. goodnight Wink | ;)

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Link2006 wrote:Let's take it outside of CP
Jeremy : Please don't.I would love to see this.I'm making the popcorn already.

How to Unload CListCtrl

georgekjolly23-Sep-06 4:12

georgekjolly

23-Sep-06 4:12

Hi all,

I have a CListCtrl object in my programme. I want to unload or destroy it programmatically. How it is possible.

Please Help me,
Thanks in advance

George

ThatsAlok23-Sep-06 6:02

ThatsAlok

23-Sep-06 6:02

georgekjolly wrote:
have a CListCtrl object in my programme. I want to unload or destroy it programmatically. How it is possible.

have you created that programmatically?

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VC Forum Q&A :- I/ IV
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Jörgen Sigvardsson23-Sep-06 8:20

23-Sep-06 8:20

CListCtrl* pCtrl;
pCtrl->DestroyWindow();
delete pCtrl;

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ThatsAlok23-Sep-06 9:09

ThatsAlok

23-Sep-06 9:09

Jörgen Sigvardsson wrote:
CListCtrl* pCtrl;
pCtrl->DestroyWindow();
delete pCtrl;

problem if it created statically!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief And you

Jörgen Sigvardsson23-Sep-06 9:11