C / C++ / MFC Discussion Boards

Viorel.9-Jun-06 3:00

9-Jun-06 3:00

I think the WM_USER message sent by your thread can interfere with another messages used by Windows. There are many reserved messages defined as WM_USER + num in Windows header files. So it is possible that your message is interpreted in an unexpected way.

In order to avoid collisions, you can use "registered messages" instead, defined with RegisterWindowMessage function. The corresponding handler can be defined using ON_REGISTERED_MESSAGE macro.

Or you can post the WM_COMMAND message with a unique command ID which is not used by any menu item.

Alternatively, you can found another ways for detecting thread completion. For instance, in your main application you can use something like this: WaitForSingleObject(*myThread, INFINITE), where myThread is a pointer to CWinThread object, returned by AfxBeginThread.

Re: Menu and threads

Russell^'9-Jun-06 3:16

Russell^'

9-Jun-06 3:16

Thanks :-Dfor your resp.

the message collision could be athe problem.
I'm also thinking that some function used to draw the menu can get my message and it doesn't like it and so delete the message.

Do you know if the "registered messages" can solve this problem too? (I haven't used they before)

And, finally, WaitForSingleObject looks like a function that will lock Frown | :(

the application in a loop waiting that the thread ends, Am I right?

Thanks

Cheers,
Russell

Re: Menu and threads

Viorel.9-Jun-06 3:44

Viorel.

9-Jun-06 3:44

The RegisterWindowMessage function defines a new window message that is guaranteed to be unique throughout the system [MSDN]. Therefore no collision will occur.

The usage of RegisterWindowMessage in context of MFC is simple. In your frame class (*.h file), define a handler like this:

afx_msg LRESULT OnMyMessage( WPARAM, LPARAM);

Then in *.cpp file declare a static variable:

static const UINT myMessageID = 
    ::RegisterWindowMessage( "put here a long string");

And then in BEGIN_MESSAGE_MAP area add:

ON_REGISTERED_MESSAGE(myMessageID, OnMyMessage)

* * *

The WaitForSingleObject can be used in non-blocking form:

if(WaitForSingleObject(*myThread, 0) == WAIT_OBJECT_0)
{
    // thread is terminated
}
else
{
    // thread is running, or an error
}

You can specify a non-zero timeout interval in WaitForSingleObject.

Hope your problem does not have other subtle reasons.

Re: Menu and threads

Russell^'9-Jun-06 4:05

Russell^'

9-Jun-06 4:05

Viorel. wrote:
Hope your problem does not have other subtle reasons

Me too!!

Thanks

Cheers,
Russell

yogendra kaushik9-Jun-06 2:18

yogendra kaushik

9-Jun-06 2:18

i want to login in mfc and it cofirm username and password from mysql table

hi plz plz its urgent
tel me code ::::::::::::::::
plz tel me code for my problem which is as::::
my problem is related to login
i make a dialog box in mfc(vc++) which contain two edit boxes one for username and one for password
and it contain a ok button
to which when we click it give the second dialog box if username and password r right else not

but as username and password r stored in mysql table so it check in mysql table and then match wheather they r correct or not

note::: if possible then plz mysql table can store no of usename and passwords
if two username and password r stored in table and when i enter one username and password then it check that one and open one dialog box
and if i enter other username and password then it open another dialog box

Please mail me

-- modified at 8:31 Friday 9th June, 2006

Re: login in mfc(VC++)

Sarath C9-Jun-06 2:26

Sarath C

9-Jun-06 2:26

dont be hurry
can you be more specific??

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Understanding State Pattern in C++

Re: login in mfc(VC++)

yogendra kaushik9-Jun-06 3:07

yogendra kaushik

9-Jun-06 3:07

plz tel me code in vc++ (MFC) which is connected to mysql

plzzzzzzz.

Please mail me

Re: login in mfc(VC++) [modified]

David Crow9-Jun-06 3:10

David Crow

9-Jun-06 3:10

Which part of this problem are you having trouble with? If you are needing a parameterized query, see here.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Re: login in mfc(VC++) [modified]

yogendra kaushik9-Jun-06 3:15

yogendra kaushik

9-Jun-06 3:15

i dont use ODBC for connection i use mysql quires such as follows to connect

f ((myDB = mysql_init((MYSQL*) 0)) &&
mysql_real_connect( myDB, "localhost", "root", NULL, NULL, 3306, NULL, CLIENT_MULTI_STATEMENTS ) )

/*MYSQL *mysql_real_connect(MYSQL *mysql, const char *host, const char *user,
const char *passwd, const char *db, unsigned int port, const char *unix_socket,
igned long client_flag) */

/*mysql_real_connect( myDB, "sanjeeva",
"root", NULL, NULL, MYSQL_PORT, NULL, CLIENT_MULTI_STATEMENTS ) )*/

{
if ( mysql_select_db( myDB,"gourav") < 0 )
{
MessageBox("Can't select the database !\nTry later.");
goto exit_here;
}
}
else
{
MessageBox("Can't connect !\nPlease try later.") ;
goto exit_here;
}
and now plz send me code to login

Please mail me

Intelligent control resizing.

Suyash9-Jun-06 1:57

Suyash

9-Jun-06 1:57

Hello,
I have a application UI developed using MFC, however the contents of the controls i.e. strings that needs to be displyed on the various controls(static texts, buttons, lilst boxes etc.) on the dialog boxes are determined at run time. So I need a Intelligent control resizing and positioning utility so that asthetics of the dialog box is maintained when one or the other control is stretched from its statically designed area.
This utility is also required for other purpose : I wish to internationalize my application and I do not want to maintain seperate resource DLL for each language supported by my application.

Any pointers or clues in this direction will be helpfull.

Thanks
Suyash

Re: Intelligent control resizing.

Sarath C9-Jun-06 2:23

Sarath C

9-Jun-06 2:23

http://www.codeproject.com/dialog/easysize.asp[^]
http://www.codeproject.com/useritems/SizingDialog.asp[^]
http://www.codeproject.com/dialog/resizabledialog.asp[^]

These may help you

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Understanding State Pattern in C++

Re: Intelligent control resizing.

Suyash11-Jun-06 22:02

Suyash

11-Jun-06 22:02

Hi Sarath,

Thanks, its of great help, in particular http://www.codeproject.com/useritems/SizingDialog.asp,
Though it doesn't solve my problem completely, i can re-use it.
However I still feel there should be some utility developed particularly for my problem, as its very generic requirement for multilingual application if we do not wish to maintain seperate resource dlls.

Anyways, Thanks much.

Regards
Suyash

errors while executing vc++ code

angelshroff9-Jun-06 1:56

angelshroff

9-Jun-06 1:56

Hi

I have one opensource of vc++. While executing this code it is giving the following errors.

1)error C2433: 'HWND' : 'inline' not permitted on data declarations

2)error C2143: syntax error : missing ';' before '{'

3)error C2447: '{' : missing function header (old-style formal list?)

4)error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

5)error C2086: 'int CALLBACK' : redefinition

If any one got these errors and knew the solution please let me know.

Thank You
angle

ThankU
angel

Re: errors while executing vc++ code

Laxman Auti9-Jun-06 2:06

Laxman Auti

9-Jun-06 2:06

Can you provide more details of the code or code snap ?
How can we guess where the errors occures and why? Confused | :confused:

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

Re: errors while executing vc++ code

Sarath C9-Jun-06 2:14

Sarath C

9-Jun-06 2:14

check your inline functions.

could u pls post the code snippet?

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Understanding State Pattern in C++

Re: errors while executing vc++ code

Hamid_RT9-Jun-06 2:20

Hamid_RT

9-Jun-06 2:20

Can you be more specific its a little.

whitesky

C++ HDD Serial Number

anwar10269-Jun-06 1:42

anwar1026

9-Jun-06 1:42

I want to know how to find the HDD Serial Number from using C++ or C or any assembly code.

Thanks,
Anwar.

Re: C++ HDD Serial Number

Sarath C9-Jun-06 1:50

Sarath C

9-Jun-06 1:50

This one might help you[^]

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Understanding State Pattern in C++

Re: C++ HDD Serial Number [modified]

Laxman Auti9-Jun-06 1:57

Laxman Auti

9-Jun-06 1:57

anwar1026 wrote:
I want to know how to find the HDD Serial Number from using C++ or C or any assembly code.

Check GetVolumeInformation() API where you get the information of the volume serial number in lpVolumeSerialNumber parameter.

Here you get more information[^]

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

-- modified at 8:01 Friday 9th June, 2006

Re: C++ HDD Serial Number

Viorel.9-Jun-06 2:30

Viorel.

9-Jun-06 2:30

If you need volume's serial number (for logical disks C:, D:, etc.), you can use GetVolumeInformation function.

If you need serial numbers of your hard disks as physical devices, you can follow the famous Windows Management Instrumentation (WMI) way, which does not look so simple:

#define _WIN32_WINNT 0x0400
#include <objbase.h>
#include <comdef.h>
#include <Wbemidl.h>

# pragma comment(lib, "wbemuuid.lib")

_COM_SMARTPTR_TYPEDEF(IWbemLocator, __uuidof(IWbemLocator));
_COM_SMARTPTR_TYPEDEF(IWbemServices, __uuidof(IWbemServices));
_COM_SMARTPTR_TYPEDEF(IEnumWbemClassObject, __uuidof(IEnumWbemClassObject));
_COM_SMARTPTR_TYPEDEF(IWbemClassObject, __uuidof(IWbemClassObject));


int main()
{

    CoInitializeEx(NULL, COINIT_MULTITHREADED);
    CoInitializeSecurity(
        NULL,
        -1,
        NULL,
        NULL,
        RPC_C_AUTHN_LEVEL_DEFAULT,
        RPC_C_IMP_LEVEL_IMPERSONATE,
        NULL,
        EOAC_NONE,
        NULL);

    IWbemLocatorPtr locator;

    CoCreateInstance(
        CLSID_WbemLocator,             
        0, 
        CLSCTX_INPROC_SERVER, 
        IID_IWbemLocator, 
        (LPVOID *)&locator
        );

    IWbemServicesPtr services;

    locator->ConnectServer(
        _bstr_t(L"ROOT\\CIMV2"),
        NULL,
        NULL,
        0,
        NULL,
        0,
        0,
        &services
        );


    IEnumWbemClassObjectPtr enumerator;
    services->ExecQuery(
        bstr_t("WQL"), 
        bstr_t("SELECT * FROM Win32_DiskDrive"),
        WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
        NULL,
        &enumerator);

    IWbemClassObjectPtr object = 000;

    for( ; ; )
    {
        ULONG ret;
        enumerator->Next(WBEM_INFINITE, 1, &object, &ret);

        if( ret == 0) break;

        _variant_t variant;

        object->Get(L"Caption", 0, &variant, 0, 0);

        MessageBox(0, _bstr_t(variant), "The serial number is:", MB_OK);
    }

    return 0;
    //
    // TODO: check any call for errors
    //
}

Hope it helps.

Re: C++ HDD Serial Number

anwar10269-Jun-06 2:52

anwar1026

9-Jun-06 2:52

I cannot find this file

Wbemidl.h

Anwar.

Re: C++ HDD Serial Number

Viorel.9-Jun-06 3:15

Viorel.

9-Jun-06 3:15

The "WbemIdl.h" file is located in "Vc*\PlatformSDK\Include\WbemIdl.h" subdirectory of Visual Studio 2003 or 2005. Are you using another compiler? Or may be you have a reduced variant of Visual Studio.

WMI includes more header files, libraries and DLLs. In Windows 98, WMI has to be installed separately.

I think you would have to download WMI from Microsoft site.

Re: C++ HDD Serial Number

anwar10269-Jun-06 4:06

anwar1026

9-Jun-06 4:06

Well... I am using Visual Studio 6.0
And it would not be possible for me to move to Visual Studio .NET 2003 or higher.

Anwar.

Re: C++ HDD Serial Number

David Crow9-Jun-06 3:25

David Crow

9-Jun-06 3:25

It's part of the Platform SDK.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

kalk

J51219829-Jun-06 1:24

J5121982

9-Jun-06 1:24

fsadf

JAYARAJ

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