Visual C++ Problem?

I am trying to use the _beginthreadex function instead of CreateThread (because I am more comfortable using older C functions), but even when I include <process.h> I get "...cpp(764) : error C2065: '_beginthreadex' : undeclared identifier"

So, I added the prototype myself:
unsigned long __cdecl _beginthreadex(void *, unsigned, unsigned (__stdcall *) (void *), void *, unsigned, unsigned *);

but then I started receiving...
...obj : error LNK2001: unresolved external symbol "unsigned long __cdecl _beginthreadex(void *,unsigned int,unsigned int (__stdcall*)(void *),void *,unsigned int,unsigned int *)" (?_beginthreadex@@YAKPAXIP6GI0@Z0IPAI@Z)

So, of course, I linked LIBCMT.LIB and also tried MSVCRT.LIB, but i still received the same "unresolved external symbol" error.

Is there something else I need to do?? (I am using Visual C++ 6.0 -- this is a non-MFC app I am working on)

Thanks

MSVC v6 help says _beginthreadex() is not supported / compatible for WIN98 or WIN2000 (only WIN95 and NT).

Thanks Novacain!

I don't have the MSDN help files since I just borrowed the Visual C++ CD from a friend...

I will have to use CreateThread() then...I was trying to avoid that since it leaks memory when used with old C functions

One problem though, I don't know an API that can work like the C function int tolower(int); Any suggestions??????

Thank you

write your own?! :)

something like

Code:

---

int MyToLower(char* string)
{
    int len = ::lstrlen(string);
    for(int i = 0; i < len; i++)
    {
        if(string[i] >= 'A' && string[i] <= 'Z')
        {
            string[i] -= 32;
        }
    }

  return(1);
}

---

note: I didn't compile this code, I just wanted to give you the idea.

good luck!
U.

Uraldor Wrote:
<<<write your own?!
something like
code:
int MyToLower(char* string)
{
int len = ::lstrlen(string);
for(int i = 0; i < len; i++)
{
if(string[i] >= 'A' && string[i] <= 'Z')
{
string[i] -= 32;
}
}

return(1);
}>>>

Well, I could of done that myself (better yet, I could have used CharToLower), but that is not what the function tolower does. I included the prototype in my last post: int tolower(int);
An int, not a char* is passed to the function. Quite frankly, I don't know how it works. And since I am looking for a replacement...

tolower is able to handle this type of conditional statement:

char *Read;
int ArrayElement;
.
.
.
if(tolower(Read[ArrayElement]) == 'i')
{
// Do this
}

I was wondering if there is an API that does the same thing.

See what I mean?

Thanks

>>>
MSVC v6 help says _beginthreadex() is not supported / compatible for WIN98 or WIN2000 (only WIN95 and NT).
<<<

I'd never noticed that, so intrigued, I tried a little test...

Code:

---

#include <windows.h>
#include <stdio.h>
#include <process.h>

unsigned Counter;

unsigned __stdcall SecondThreadFunc( void* pArguments )
{
    printf( "i tråd...\n" );
    while ( Counter < 1000000 )
        Counter++;

    _endthreadex( 0 );
    return 0;
}

void main()
{
    HANDLE hThread;
    unsigned threadID;

    printf( "lave tråd...\n" );
    hThread = (HANDLE)_beginthreadex( NULL, 0, &SecondThreadFunc, NULL, 0,
        &threadID );
    WaitForSingleObject( hThread, INFINITE );
    printf( "tælle skulle være 1000000; er -> %d\n", Counter );
    CloseHandle( hThread );
}

---

... works fine with Win 2000, VC 6.0 Pro.

I bet you haven't changed your project settings to multithreaded...

>I don't know an API that can work like
>the C function int tolower(int);

>Any suggestions??????

Use the C function ? Who said you may not use it ?

nvoigt...wrote, "Use the C function ? Who said you may not use it ?"

"A thread that uses functions from the C run-time libraries should use the beginthread and endthread C run-time functions for thread management rather than CreateThread and ExitThread. Failure to do so results in small memory leaks when ExitThread is called. "

http://students.cs.byu.edu/~cs345ta/...helpfiles.html

Is this still the case???? I assume it is

adrianxw wrote, "... works fine with Win 2000, VC 6.0 Pro.
I bet you haven't changed your project settings to multithreaded..."

Under Projects - Settings (or Alt F7) - Link - Object/library modules: I added the MSVCRT.LIB (and also tried LIBCMT.LIB) but I don't think that is what you meant ...So I will search the MSDN home page...

Thanks for the help

By the way, I meant CharLower not CharToLower :-p

Later on...

Ahhh...I found it...
"To find these options in the development environment, click Settings on the Project menu. Then click the C/C++ tab, and click Code Generation in the Category box. See the Use Run-Time Library drop-down box. "

http://msdn.microsoft.com/library/de...t.2c_2f.ld.asp

http://msdn.microsoft.com/library/de...d_programs.asp

Thanks Adrianxw, I had no idea

>>> Is this still the case???? I assume it is

I had a little discussion with Sunlight about this, and whilst he decided in theory it should no longer be necessary, we agreed that we would both continue using beginthreadex().

>>> Ahhh...I found it...

Sorry, I assumed you knew and had simply forgotten to do it. I should have given the sequence with my message.

Glad your okay now.