Re: MFC Worker Thread Problem - C / C++ / MFC Discussion Boards

Nick Z.11-Apr-05 18:12

11-Apr-05 18:12

Thank you for the excelent explanation.
I only need threading for a small portion of my program, and I didnt want to focus on the topic too much.
Your examples make my life so much easier. Thanks! Cool | :cool:

UNICODE COMPILATION ReplaceSel usage for char array.

kristna11-Apr-05 11:19

kristna

11-Apr-05 11:19

Hi !

I am compiling for UNICODE, a RichEditView in VC++ 6.0

A private variable prchars is defined in RichEditView Class.

In wordpad.h file

private:
char prchars[6];

********************************************************
In WordPadView.cpp in the constructor method I initialised the value

char prchars[0]='\0';

Now I am using

GetRichEditCtrl().ReplaceSel(prchars);

is giving an error

'ReplaceSel' : cannot convert parameter 1 from 'char [6]' to 'const unsigned short *'

even if i use
GetRichEditCtrl().ReplaceSel(_T(prchars)); it is not working. But it is working for constants in _T() ie.,

GetRichEditCtrl().ReplaceSel(_T("D"));

How can I use a character array variable prchars in the place of "D" ?

Thanks in advance.

Jai Srimannarayana

Re: UNICODE COMPILATION ReplaceSel usage for char array.

Graham Bradshaw11-Apr-05 12:05

Graham Bradshaw

11-Apr-05 12:05

You have to replace the char declarations with TCHAR, like:

TCHAR prchars[0]='\0';

Re: UNICODE COMPILATION ReplaceSel usage for char array.

kristna11-Apr-05 22:55

kristna

11-Apr-05 22:55

Thanks a lot. It worked fine.

" To distribute True knowledge to the right seeker is the best charity one can ever do is one's life. Blessed are those, for, they are specially loved by God "

Jai Srimannarayana

MFC Worker Thread Problem

CNewbie11-Apr-05 11:00

CNewbie

11-Apr-05 11:00

I Keep getting the following error when I try to compile my multithread code:

error C2665: 'AfxBeginThread' : none of the 2 overloads can convert parameter 1 from type 'UINT (LPVOID)'

Here is what I did:

I Declared my worker thread in my header file as such:

UINT Read(LPVOID Param);

This is the actual function as I have it in my code:

UINT CMyClass::Read(LPVOID Param)
{
CMyClass* pAppView= (CMyClass*)Param;
/*
*
*Code Here
*
*/
return 0;
}

And here is how I am calling the new Worker Thread from within my OnInitDialog() Function;

AfxBeginThread(Read,this);

I gathered all of this code from various articles on MFC Multithreading, but regardless I keep getting the error above. Can someone please tell me why The 'AfxBeginThread' statement is wrong? I have seen it done this way in the other articles.

Thanks

Re: MFC Worker Thread Problem

Orkun GEDiK11-Apr-05 11:50

Orkun GEDiK

11-Apr-05 11:50

Hello,

You need to declare your worker thread function like at below;

UINT Read(LPVOID Param)
{
/*
*
*Code Here
*
*/
return 0;
}

Regards

Orkun GEDiK
SAP R/3 Software & System Support Specialist
ASTRON

Re: MFC Worker Thread Problem

CNewbie11-Apr-05 11:56

CNewbie

11-Apr-05 11:56

Do you mean Declaring it in my header file like that?

If so, why? Wouldn't a simply deaclaration like such be enough:

UINT Read(LPVOID Param);

And if it does need to be a full function declaration like you said please explain to me why.

Thank you.

Re: MFC Worker Thread Problem

Blake Miller11-Apr-05 12:33

Blake Miller

11-Apr-05 12:33

You can not call or pass the non-static member function of a class to AfxBeginThread.

You defined this:

UINT CMyClass::Read(LPVOID Param)

You need to make Read a stand-alone function.

Otherwise, in your header file, within the class, you need to declare it like this:

static UINT Read(LPVOID Param)

If it is declared as static, then
UINT CMyClass::Read(LPVOID Param)
is valid code.

Re: MFC Worker Thread Problem

toxcct11-Apr-05 20:55

toxcct

11-Apr-05 20:55

did you ever heard of this pointer ?

when you write

UINT CMyClass::Read(LPVOID Param);

the compiler understands

UINT CMyClass::Read(CMyClass* this, LPVOID Param);

so, the function header is not what you were expecting...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: MFC Worker Thread Problem

CNewbie11-Apr-05 20:58

CNewbie

11-Apr-05 20:58

thank you all for the replies. The "static" keyword worked Smile | :)

Re: MFC Worker Thread Problem

Iain Clarke, Warrior Programmer11-Apr-05 12:37

Iain Clarke, Warrior Programmer

11-Apr-05 12:37

If you convert your function in the header to be static, eg:

class CMyClass
{
    ....
    static UINT Read (LPVOID Param);

    ....

    BOOL StartMyThread ();
}

You can then do:

BOOL CMyClass:StartMyThread ()
{
    AfxBeginThread (Read, this);
}

The trick is the static keyword.

If you don't put in the static, then your function is equivalent to:
UINT CMyClass_Read (CMyClass *this, LPVOID Param)
which is why the compiler is complaining.

Iain.

Image resize in GDI+

smicikli11-Apr-05 10:18

smicikli

11-Apr-05 10:18

Hi!

I would like resize my Image. But I have a little problem, when I would like a bigger image:

My code:
//Bitmap* bitmap;-->in the Doc
//szel=original width, mag=original height
Bitmap* clone = pDoc->bitmap->Clone(0, 0, szel, mag, PixelFormat32bppRGB);

delete pDoc->bitmap;
pDoc->bitmap = clone->Clone(0, 0, Dialog.m_szelesseg, Dialog.m_magassag, PixelFormat32bppRGB);

Graphics graphics(pDoc->bitmap);
float a1=(float)Dialog.m_szelesseg/(float)szel;
float a2=(float)Dialog.m_magassag/(float)mag;

graphics.ScaleTransform(arany1, arany2, MatrixOrderAppend);
graphics.DrawImage(clone, 0, 0);

delete clone;

I have an error message when after this resize (bigger) I would like Save the bitmap, or redraw. What's the matter?

Please help!

The error message don't say nothing!

ATL configuration

act_x11-Apr-05 9:47

act_x

11-Apr-05 9:47

I have been working with my debug version of an ATL based COM server.

Unfortunately I cannot find a
Win32 Release configuration

In the the other configurations , file operations(fopen , fclose etc ) are invalid .

Is there a way I can specify a configuration similar to debug , but without the opimizations ?

Engineering is the effort !

Coming out of StandBy application crashes

casid11-Apr-05 9:32

casid

11-Apr-05 9:32

My MSVC 6.0 MFC application crashes for a few people when they come out of StandBy mode when its running. I've never been able to reproduce this myself but I'm wondering what areas to look at that could cause a crash at this time. Here's the Dr. Watson log from the thread that crashes below. It looks at though the code just didn't get loaded again. Any ideas or suggestions on how to debug something like this?

*----> State Dump for Thread Id 0xec4 <----*<br />
<br />
eax=00000001 ebx=00ca2d00 ecx=0000000a edx=7c90eb94 esi=0669daa0 edi=00000000<br />
eip=0124b3c7 esp=0189ff60 ebp=0189ff80 iopl=0         nv up ei pl zr na po nc<br />
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000246<br />
<br />
function: <nosymbols><br />
No prior disassembly possible<br />
        0124b3c7 ??               ???<br />
        0124b3c9 ??               ???<br />
        0124b3cb ??               ???<br />
        0124b3cd ??               ???<br />
        0124b3cf ??               ???<br />
        0124b3d1 ??               ???<br />
        0124b3d3 ??               ???<br />
        0124b3d5 ??               ???<br />
        0124b3d7 ??               ???<br />
FAULT ->0124b3c7 ??               ???<br />
Error 0x00000001<br />
        0124b3c9 ??               ???<br />
        0124b3cb ??               ???<br />
        0124b3cd ??               ???<br />
        0124b3cf ??               ???<br />
        0124b3d1 ??               ???<br />
        0124b3d3 ??               ???<br />
        0124b3d5 ??               ???<br />
        0124b3d7 ??               ???<br />
        0124b3d9 ??               ???<br />
        0124b3db ??               ???<br />
<br />
*----> Stack Back Trace <----*<br />
WARNING: Stack unwind information not available. Following frames may be wrong.<br />
ChildEBP RetAddr  Args to Child              <br />
0189ff5c 000d0670 00000218 0000000a 00000000 0x124b3c7<br />
0189ff80 77c3a3b0 00bda558 00000000 7c9105c8 0xd0670<br />
0189ffb4 7c80b50b 00ca2d00 00000000 7c9105c8 msvcrt!endthreadex+0xa9<br />
0189ffec 00000000 77c3a341 00ca2d00 00000000 kernel32!GetModuleFileNameA+0x1b4<br />
<br />
*----> Raw Stack Dump <----*<br />
000000000189ff60  70 06 0d 00 18 02 00 00 - 0a 00 00 00 00 00 00 00  p...............<br />
000000000189ff70  69 79 6d 0d 79 04 00 00 - 8b 01 00 00 58 a5 bd 00  iym.y.......X...<br />
000000000189ff80  b4 ff 89 01 b0 a3 c3 77 - 58 a5 bd 00 00 00 00 00  .......wX.......<br />
000000000189ff90  c8 05 91 7c 00 2d ca 00 - 05 00 00 c0 8c ff 89 01  ...|.-..........<br />
000000000189ffa0  84 fb 89 01 dc ff 89 01 - 94 5c c3 77 d8 40 c1 77  .........\.w.@.w<br />
000000000189ffb0  00 00 00 00 ec ff 89 01 - 0b b5 80 7c 00 2d ca 00  ...........|.-..<br />
000000000189ffc0  00 00 00 00 c8 05 91 7c - 00 2d ca 00 00 a0 fd 7f  .......|.-......<br />
000000000189ffd0  05 00 00 c0 c0 ff 89 01 - 84 fb 89 01 ff ff ff ff  ................<br />
000000000189ffe0  f3 99 83 7c 18 b5 80 7c - 00 00 00 00 00 00 00 00  ...|...|........<br />
000000000189fff0  00 00 00 00 41 a3 c3 77 - 00 2d ca 00 00 00 00 00  ....A..w.-......<br />
00000000018a0000  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................<br />
00000000018a0010  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................<br />
00000000018a0020  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................<br />
00000000018a0030  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................<br />
00000000018a0040  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................<br />
00000000018a0050  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................<br />
00000000018a0060  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................<br />
00000000018a0070  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................<br />
00000000018a0080  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................<br />
00000000018a0090  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................

Re: Coming out of StandBy application crashes

Blake Miller11-Apr-05 12:49

Blake Miller

11-Apr-05 12:49

Wow

Two ideas come to mind.

I see msvcrt!endthreadex in the call stack. If that is at all reasonably correct, then maybe you would want to catch the entrance to the standby mode within your application and prevent your own application from terminating or leaving any threads once standby is about to be 'entered' and then you can leave once you have resumed.

Also, device states might not be identical coming out of standby. Perhaps your worker thread is ineracting with a device which has different state coming out of standy?

Just some ideas, hope they help.

memory leaks vs. the OS

Maximilien11-Apr-05 9:30

Maximilien

11-Apr-05 9:30

I know memory leaks are bad ... and that every memory blocks allocted by my 10 fingers should be free by those same 10 fingers, and that's something I do but ...

maybe this is a really newbee question.

On Windows, if I allocate memory ( like MyClass* p = new MyClass ) and I quit the application without deleting it ( delete p ) what really happens to the memory ? Is it reclaimed by the OS ?

Any reference on MSDN on that topic ?

Thanks for the OS cluelessness.

Max.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: memory leaks vs. the OS

Rick York11-Apr-05 10:17

Rick York

11-Apr-05 10:17

In NT and its successors the OS does reclaim the memory and all other resources used by a process when it terminates. W95, W98, and ME are not as well behaved.

Different toolbars

act_x11-Apr-05 8:28

act_x

11-Apr-05 8:28

for an MDI project that has multiple Document templates how can i have different toolbars for each of the views

DOC template 1

Doc1
ChildFrame1
View1

DOC template 2

Doc1
ChildFrame1
View2

is there a way to load a toolbar based on the view ?

Re: Different toolbars

BambooMoon11-Apr-05 9:40

BambooMoon

11-Apr-05 9:40

An MDI application has multiple child frame windows. Associate the different tool bars with the child frame windows in OnCreate(), exactly the way CMainFrame::OnCreate() does.

Wincore.cpp Line 958 Assert When Using MFC Classes

erez_oh11-Apr-05 7:23

erez_oh

11-Apr-05 7:23

Hello everyone,

I have a big problem while i'm trying to show a popup bar which i run as a thread. The thread is being started by a DLL that i wrote.
i keep getting the message: "Debug Assertion Failed, File-Wincore.cpp , Line - 958 ". I tried to use the solution suggested in msdn regarding the definition of a manage macro : AFX_MANAGE_STATE(AfxGetStaticModuleState())...
but no LUCK.
if anyone know how to make it work out please send your solution.
Thanks,
Erez

Erez

Re: Wincore.cpp Line 958 Assert When Using MFC Classes

Blake Miller11-Apr-05 12:51

Blake Miller

11-Apr-05 12:51

Maybe you need to create a message queue for your thread prior to generating a window in the same thread. Try calling PeekMessage() right away, so a message queue is generated.

problem executing EXE file with shellexecute

Green Fuze11-Apr-05 7:00

Green Fuze

11-Apr-05 7:00

Hey Everybody!

I wrote this code:

HINSTANCE hInst = ShellExecute(0,                           <br />
    "open",                     <br />
    "C:\\Bonus.exe",  <br />
    NULL,<br />
    NULL,                           <br />
    SW_SHOW);<br />

for some reason the code does NOTHING! it does not execute the exe file.
by the way, it is a flash projector (the exe file).

does anyone has any idea what may cause this problem, and how to solve it?

Thanks!!!

Re: problem executing EXE file with shellexecute

Daniel132411-Apr-05 8:01

Daniel1324

11-Apr-05 8:01

Check the return value... if its less than or equal to 32, then an error has occured. Look up ShellExecute in MSDN for the error codes.

Re: problem executing EXE file with shellexecute

Green Fuze11-Apr-05 12:36

Green Fuze

11-Apr-05 12:36

thanks!

but I already fixed it.

it seems that I had a typo somewhere in my code, but for some reason the compiler ignored it... (?!)

thanks anyone Smile | :)

Re: problem executing EXE file with shellexecute

ddmcr11-Apr-05 8:31

ddmcr

11-Apr-05 8:31

Try this

WinExec("c:\\Bonus.exe",1);

m0n0

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.