C / C++ / MFC Discussion Boards

includeh101-Dec-04 3:50

1-Dec-04 3:50

Q1-does function CreateMapFile() create the file in MEMORY?
Q2-do we need to call DeleteFile() to clean the file from memory or somewhere before app exits?

includeh10

Re: CreateMapFile

Blake Miller1-Dec-04 5:15

Blake Miller

1-Dec-04 5:15

is CreateMapFile?

You have CreateFileMapping and OpenFileMapping which return a handle. Then use CloseHandle before your program exits.

No, you have to also follow the CreateFileMapping and OpenFileMapping with MapViewOfFileEx and then use UnmapViewOfFile

Sequence:
CreateFileMapping or OpenFileMapping
MapViewOfFileEx
Use the mapped memory
UnmapViewOfFile
CloseHandle

Re: CreateMapFile

includeh101-Dec-04 6:34

includeh10

1-Dec-04 6:34

not really.

if doing
CreateFileMapping
......
CloseHandle

the file is still there because another app can open it.

i need to delete the file because i have to create thousands of maping files, i need to delete some files if they are useless.

CloseHandle does not delete mapping files - similar to normal files.

includeh10

Re: CreateMapFile

Blake Miller1-Dec-04 6:43

Blake Miller

1-Dec-04 6:43

MSDN To fully close a file mapping object, an application must unmap all mapped views of the file mapping object by calling UnmapViewOfFile, and close the file mapping object handle by calling CloseHandle. The order in which these functions are called does not matter. The call to UnmapViewOfFile is necessary because mapped views of a file mapping object maintain internal open handles to the object, and a file mapping object will not close until all open handles to it are closed.

So, if you unmap all the views and then close the handle, the memory map file will be gone.
If you want to delete the 'regular' file, then use DeleteFile().

Otherwise, you are getting something mixed up or I don't understand what you want to do.

There is no need to 'delete' a memory mapped file. It will happen on its own if the above guidelines are followed.

how to pass data to another application?

includeh101-Dec-04 3:36

includeh10

1-Dec-04 3:36

i need to pass a string from app A to app B.
app B is dialog based, app A knows HWND handle of app B.

i test by SendMessage or PostMessage from A to B, but the string can not be passed.

any idea?
thx

includeh10

Re: how to pass data to another application?

David Crow1-Dec-04 3:43

David Crow

1-Dec-04 3:43

includeh10 wrote:
i test by SendMessage or PostMessage...

I presume you used the WM_COPYDATA message. Yes? Otherwise, a code snippet would be especially helpful.

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

Re: how to pass data to another application?

includeh101-Dec-04 4:03

includeh10

1-Dec-04 4:03

no, i use in this way:
(in app A)
::SendMessage(hwndB,WM_USER+1,(int)(LPCSTR)csA,0);
//csA is object of CString

(in app B)
WindowProc(UINT msg,WPAREM w,LPARAM l)
{
switch(msg)
{
case WM_USER+1:
{
CString csB=(char*)w;
}
break;
............

but csB gets nothing - the reason i guess is that a string can not be passed to another app (app adress) in this way.

is WM_COPYDATA better?
any suggestion?

includeh10

Re: how to pass data to another application?

David Crow1-Dec-04 4:13

David Crow

1-Dec-04 4:13

includeh10 wrote:
is WM_COPYDATA better?

I'll let you be the judge of that:

http://tinyurl.com/62khl

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

Re: how to pass data to another application?

includeh101-Dec-04 4:21

includeh10

1-Dec-04 4:21

it looks great.
i will test it.

thanks

includeh10

Re: how to pass data to another application?

includeh101-Dec-04 6:54

includeh10

1-Dec-04 6:54

i tested it.
it is perfect!!!!
cheers

includeh10

Re: how to pass data to another application?

Peter Weyzen1-Dec-04 8:02

Peter Weyzen

1-Dec-04 8:02

additionally, there's another simple way to do it...

Convert the string to a global atom: GlobalAddAtom
ATOM GlobalAddAtom( LPCTSTR lpString );

this converts the string to a handle -- which you can transmit via Post/Send Message to any other process. Use GlobalGetAtomName() on the other end to convert it back.

It's a simple way to send small strings (255 chars or less).

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<A HREF="http://www.santacruznetworks.com">Santa Cruz Networks</A>

Minimum pane size in a CSplitterWnd

Jitendra gangwar1-Dec-04 3:22

Jitendra gangwar

1-Dec-04 3:22

Hello all,

I am using a CSplitterWnd. I would like to prevent the user from dragging
the splitter any closer than a certain distance from the edge of the window.
I found that CSplitterWnd::SetRowInfo() and CSplitterWnd::SetColInfo() allow
you to set a "minimum" size. However, it's not the case that the user can't
drag the splitter past this minimum. It's just that if he does so drag the
splitter, the window size will become 0.

Is there a way to do what I wish and pysically disallow the splitter to move
past a certain point?

Thanks,
Jitendra

Problem with CDialog::InitModalIndirect()

Eugene Pustovoyt1-Dec-04 1:38

Eugene Pustovoyt

1-Dec-04 1:38

I'm wrote a simple code to creates a empty Dialog. But I've an exception with him. Why?

    DLGTEMPLATE dlg;
dlg.x = 0;
dlg.y = 0;
dlg.cx = 200;
dlg.cy = 200;
dlg.style = WS_BORDER|WS_CHILD|WS_VISIBLE;
dlg.dwExtendedStyle = 0;
dlg.cdit = 0;
CDialog Dialog;
Dialog.InitModalIndirect(&dlg);
DoModal();

Best regards,
Eugene Pustovoyt

ICQ UIN: 161325180

Re: Problem with CDialog::InitModalIndirect()

John R. Shaw1-Dec-04 5:15

John R. Shaw

1-Dec-04 5:15

From MSDN: "To create a modal dialog box indirectly, first allocate a global block of memory and fill it with the dialog box template. Then call the empty CDialog constructor to construct the dialog-box object. Next, call InitModalIndirect to store your handle to the in-memory dialog-box template."

Here is the most IMPORTANT part:
"first allocate a global block of memory"

It does not matter which version of InitModalIndirect you call, the DLGTEMPLATE must be in a globaly allocated memory block. That means using GlobalAlloc(...).

If this is not the cause of exception, then the MSDN remarks section may be wrong.

The only question that remains is: who is responsible for freeing the memeory?

Search the MSDN for the sample code:
"DLGTEMPL: Creating Dialog Templates Dynamically"

Good Luck!

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

OMNIS Database

si_691-Dec-04 1:32

si_69

1-Dec-04 1:32

Hi all

can anyone recommend the best way of accessing an omnis database ?

at the moment im using an mfc odbc consumer class connection using crecordset to access it

but it sooo slow when querying

or maybe anyone knows how to export the tables from omnis to say access in c++

any ideas Confused | :confused:

thanks

si

How to have bitmaps in lib

Jesper Knudsen1-Dec-04 0:35

Jesper Knudsen

1-Dec-04 0:35

I'm creating a library with som custom controls. How can I have a bitmap drawn on a custom button?

When the button control is in a .lib - where to put the image?

What about resource conflicts?

Thanks for any comment

Re: How to have bitmaps in lib

John R. Shaw1-Dec-04 4:34

John R. Shaw

1-Dec-04 4:34

Put them in a DLL or ActiveX library, both types of libraries have there own resources. Their resources can not conflict with your resources, unless the DLL treats externaly supplied resource IDs the same as internaly supplied IDs.

For buttons:
http://www.codeproject.com/buttonctrl/[^]

For libraries visit the COM or Libraries section of codeproject.

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Re: How to have bitmaps in lib

Jesper Knudsen1-Dec-04 20:12

Jesper Knudsen

1-Dec-04 20:12

To make it simple, I made this small utility that converts a binary file into an array of unsigned chars for the compiler to read. This enables me to #include the binary chunk directly into the source.

Wooh, does this smell like good old times..

SQLBulkOperations returns SQL_NEED_DATA with Oracle

Anonymous1-Dec-04 0:10

Anonymous

1-Dec-04 0:10

Hi,

I'm using SQLBulkOperations(m_hstmt,SQL_ADD) in one of my methods when trying to bulk copy a table from one db to another.
It was tested and worked fine for copying from Oracle to mdb, but when trying to copy from mdb to oracle or oracle to oracle I get SQL_NEED_DATA.
I checked over and over and the code seems fine to me (buffers were created and assigned). The SQLBulkOperation call looks like these:

ODBC_CALL(::SQLSetStmtAttr(m_hstmt, SQL_ATTR_ROW_ARRAY_SIZE, (void*)wRow, 0));
if(!Check(nRetCode)){
}
ODBC_CALL(::SQLBulkOperations(m_hstmt,SQL_ADD));

Can anyone help ?
Thanks

Color for the Tree Control Item

Neelesh K J Jain30-Nov-04 23:44

Neelesh K J Jain

30-Nov-04 23:44

Hello Friends,
I am using CFormView on which I have a combo box and a Tree Control. When any item is being inserted depending upon some boolean variable the color for the item should be either red or black.

For example;

bool valid = false;

if(valid)
treecontrol item text color = red;
else
treecontrol item text color = black;

I am not using CTreeView, but I have CFormView on which they are two controls.
I am not able to set the color for the individual items.
Please help regarding the above matter.
Thanks in Advance.

Neelesh K J Jain.

Re: Color for the Tree Control Item

RChin1-Dec-04 1:32

RChin

1-Dec-04 1:32

Neelesh K J Jain wrote:
I am not able to set the color for the individual items

Thats because there are no options to set individual display properties, both for the Tree Control and the List Control.
If you need such control, have a look at using Custom Drawing. Take a look at this[^] and this[^] to start.

I Dream of Absolute Zero

Problem with IHTMLDocument2

laurentmuratet30-Nov-04 23:40

laurentmuratet

30-Nov-04 23:40

I am trying to implement a web page filter. I define the invoke method and pass the IE events to my application thanks to the Advise method. It works well but I can only obtain the content of the current page when the DOCUMENTCOMPLETE event is triggered. I would like to have it when the BEFORENAVIGATE2 event is triggered to prevent some pages from displaying. It would also fit to tell IE to wait until a page is completely download before displaying it. I am trying to get the HTML content of a web page before IE starts displaying it. I don't know how to do it.

Thanks for your help.

Re: Problem with IHTMLDocument2

Neville Franks1-Dec-04 10:42

Neville Franks

1-Dec-04 10:42

I don't have a specific answer for you but suggest you have a look at Ehsan's articles http://www.beginthread.com/Ehsan/ViewAllArticles[^] which may be of help.

Also consider posting on: microsoft.public.inetsdk.programming.mshtml_hosting

Neville Franks, Author of ED for Windows www.getsoft.com and Surfulater www.surfulater.com "Save what you Surf"

EDIT CONTROL looses the connection

elo471130-Nov-04 22:00

elo4711

30-Nov-04 22:00

EDIT CONTROL looses the connection
Hi,

I am currently working on a program in VISUAL C ++ 6.0 (MFC) in which I would like to include an ADO DATA CONTROL 6.0 and a MS MASKED EDIT CONTROL.
The EDIT CONTROL is connected with the DATA CONTROL after program start-up.
All desired fields are indicated with the EDIT CONTROL.
Should the RECORDS SOURCE of the DATA Controls be changed or be limited during the runtime , the EDIT CONTROL looses the connection to the DATA CONTROL.
I have already tried everything REFRESH ()..., BindDefaultProperty or BindProperty, unfortunately, without success.
I could not find a Solution to this problem or topic even in the Internet.
I would be thankful for a hint or for your assistance.

thanks
elo4711

dynamic C programming on Speech Recognition using RCM3400

Member 155701630-Nov-04 21:57

Member 1557016

30-Nov-04 21:57

hi all the experts,

i'm glad that at last i found a place where i can look for helps.i'm
now doin my final year project using the 8bit Rabbit microprocessor
(RCM3400). i'm developing a wireless tracking system using the GPS
and the rabbit microprocessor.what i'm planning to do is i wish to
add in the speech recognition function to help turn on the system.i wish some feedback or guideline on how to programm the speech
recignition into my rabbit microprocessor.is it hard?what i am worry
about is whether the microprocessor that i'm using suitable for this
function or not.all i wish to do is just a very simple or maybe low
end speech recognition.

Regards,
Joneo

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