Re: this is actually how the situation is - C / C++ / MFC Discussion Boards

how to copy binary data? How to get its length?

nss3-Aug-02 6:20

3-Aug-02 6:20

I have:

char* tempImage = (char *) (_bstr_t) pRecordset->Fields->GetItem ("pImage")->Value;

The stuff stored in Value is a pointer to data gotten out of a bmp (so its binary right? )

So should I be doing char*?

Not sure.

Also how to get the size of the image stored in Value? Strlen would count upto the first embedded Null, of which there are plenty in the binary data. So, what function to read the size?
Thanks,
ns

Re: how to copy binary data? How to get its length?

Daniel Turini3-Aug-02 11:46

Daniel Turini

3-Aug-02 11:46

Re: how to copy binary data? How to get its length?

Daniel Turini3-Aug-02 11:46

Daniel Turini

3-Aug-02 11:46

The safer way would be checking the Value.vt and verify the Variant type you are receiving. Prolly a SAFEARRAY of BYTE or a BSTR; in this case, I would not use char *, I would use LPCTSTR indeed. The _bstr_t or SAFEARRAY manipulation classes and APIs have methods for safely determining the length.

Concussus surgo.
When struck I rise.

Detect an open window and active it if not active

youssef3-Aug-02 5:47

youssef

3-Aug-02 5:47

Hi,

I would like detect when I execute an application (exe) if exist. Ok for that part I finding the code.
Now I would like if the EXE exist active the window.

Best Regards

youssef

how to use valarray

Anonymous3-Aug-02 4:57

Anonymous

3-Aug-02 4:57

how to use valarray.
i get many errors from #include<valarray>

Document/View trouble

carlos del piero3-Aug-02 4:32

carlos del piero

3-Aug-02 4:32

hi,
i have lots of drawing to be done with all tha data in the doc.after initialising the starting point and various other params,i draw it throught the view in ondraw like
pDocument->Draw(pDC)
because the drawing takes all params present in the doc itself.

Now,i need to draw the diagram right when a new scrollview is created and i follow all the regular steps like setting the map mode etc just like the scribble example.

The problem is,the view created on startup has the diagram but the new one created from Ctrl+N fails and takes me to scrollview source's line that checks if the mapping mode in MM_NONE.

Why.If the first one drew all the others should!I am stuck;help

Carlos

Re: Document/View trouble

Ernest Laurentin3-Aug-02 6:33

Ernest Laurentin

3-Aug-02 6:33

Is this a SDI or MDI application? If MDI (that's what I guess), your new doc is blank!
Do you need to share the same document between documents object? then why having separate docs objects. Do you know you may have many views attached to a single document? is it what you are trying to accomplish here?
You may call UpdateAllViews(...) to force redraw of your views, use lHint if you want to indicate which part (object) need to be invalidated.

As my daughter would say, "... Whatever!"

Re: this is actually how the situation is

carlos dp4-Aug-02 2:25

carlos dp

4-Aug-02 2:25

hi ernsest
my sw deals with with system designing so there has to be many diagrams which are finally connected to a main one.For this i have ot have different documents and with that different views.
As i said,the view created on startup is fine but not the new ones.
(i have now come to the gui part of my sw and am testing.Actually,no views should be on startup but created only when required with a project;when Ctrl+N dosent work i guess the views created on demand too will not work)

carlos

error 1189 in mfc app.

nss3-Aug-02 4:25

nss

3-Aug-02 4:25

In a non MFC app theres a try-catch thing like:

catch ( _com_error &e )
{
    _bstr_t bstrSource (e.Source());
    _bstr_t bstrDescription (e.Description());
    TRACE ( "Exception thrown for classes generated by #import" );
    TRACE ( "\tCode = %08lx\n", e.Error ());
    TRACE ( "\tCode meaning = %s\n", e.ErrorMessage ());
    TRACE ( "\tSource = %s\n", (LPCTSTR) bstrSource);
    TRACE ( "\tDescription = %s\n", (LPCTSTR) bstrDescription);

    AfxMessageBox ((LPCTSTR) bstrDescription);
}
catch (...)
{
    TRACE ( "*** Unhandled Exception ***" );
}

I am using this code in an MFC app, in a new class that I am making. When I compiled I got the error:

c:\program files\microsoft visual studio\vc98\mfc\include\afxv_w32.h(14) : fatal error C1189: #error :  WINDOWS.H already included.  MFC apps must not #include <windows.h>

When I looked this up in MSDN , I see

Fatal Error C1189
#error : user supplied error message

This error message is generated when there is an #error directive in the program. For example:

#undef _WIN32

#if !defined(_WIN32)
#error _WIN32 must be defined //error
#endif

int main() {
   return 0;
}

I only have #include "stdafx.h" in my new projects class .h file.

What can I do about this error?

Thanks,
ns

all I have in my .h file is two includes and 1 import:

nss3-Aug-02 4:30

nss

3-Aug-02 4:30

#import "C:\\Program Files\\Common Files\\SYSTEM\\ADO\\msado15.dll" \
		no_namespace \
		rename( "EOF", "adoEOF" )

#include "stdafx.h"  //only in h file, not cpp file
#include <ole2.h>

This error started happening when I included #include "stdafx.h", but without it it didnt know what CString was.

These are two standalone .cpp and .h files and I havent instantaited them anywhere in the main MFC project, so theres no #include "myClass.h" except in myClass.cpp.

Does this clarify matters?

Please answer. I am very puzzled!

I have "automatic use of precompiled headers"

nss3-Aug-02 4:35

nss

3-Aug-02 4:35

In project settings I had to set:"automatic use of precompiled headers", because without that I got the error "unexpected end of file found while loooking for precompiled header directive".
Is this relevant?

Thank you,
ns

CRichEditCtrl MFC

Anonymous3-Aug-02 1:58

Anonymous

3-Aug-02 1:58

There is a function setautourldetect suporrted by CRichEditCtrl as per MSDN but when actually called there is no such function in the header file . there is a compiltion error can anybody help me ?????

Re: CRichEditCtrl MFC

Pavel Klocek3-Aug-02 2:08

Pavel Klocek

3-Aug-02 2:08

In January 2001 MSDN is no such function by CRichEditCtrl. Maybe it's something added in the latest Platform SDK?

Sonork 100.15206;PavelK

Re: CRichEditCtrl MFC

Nish Nishant3-Aug-02 3:28

Nish Nishant

3-Aug-02 3:28

BOOL SetAutoURLDetect(
   BOOL bEnable = TRUE 
);

I found that in the MSDN that comes with VS.NET

What's your VC++ version?

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: CRichEditCtrl MFC

Ernest Laurentin3-Aug-02 6:20

Ernest Laurentin

3-Aug-02 6:20

I think there is a macro for this in ATL but you may want to send the message
SendMessage(
(HWND) hWnd, // handle to destination window
EM_AUTOURLDETECT, // message to send
(WPARAM) wParam, // URL detection state
(LPARAM) lParam // not used; must be zero
);
Parameters
wParam
Specify TRUE to enable automatic URL detection or FALSE to disable it.
lParam
This parameter is not used; it must be zero.

As my daughter would say, "... Whatever!"

CRichEditCtrl MFC

Anonymous3-Aug-02 1:58

Anonymous

3-Aug-02 1:58

CSplitterWnd Question

Anonymous3-Aug-02 1:18

Anonymous

3-Aug-02 1:18

Hello;

I have trouble with CSplitterWnd and views. I have working on multiple view with CSplitterWnd sample. But i couldn't found a way to communicating views with each other. How can i set a property of an object on the other view from active view?

Thanks...

Re: CSplitterWnd Question

Pavel Klocek3-Aug-02 2:18

Pavel Klocek

3-Aug-02 2:18

The member function CWnd* GetPane( int row, int col ) which returns window pointer to the window/view in specified pane can be of use.

Sonork 100.15206;PavelK

Problem In using tree control

Prateeti2-Aug-02 23:23

Prateeti

2-Aug-02 23:23

I have developed a chat server. In that I am displaying online/offline user list using tree control, I can see the list in all other systems except my DELL laptop which has XP Pro. Sometimes its showing 2 or 3 users including me...and sometimes its not showing a single user...I dont know whats happening. May be there will be some settings for DELL with XP Pro which I dont know. If somebody knows abt it please tell me.
Thanks
Prateeti

Modify the context menu string at runtime.

Neha2-Aug-02 23:19

Neha

2-Aug-02 23:19

Hi,
I would like to modify the context menu string at runtime.
So i had written settext(..) in OnUpdateCommandUI ().
But it is not updating the text.Could anyone help me..
Thanks

Re: Modify the context menu string at runtime.

Nish Nishant2-Aug-02 23:27

Nish Nishant

2-Aug-02 23:27

CMenu::ModifyMenu

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: Modify the context menu string at runtime.

Neha2-Aug-02 23:57

Neha

2-Aug-02 23:57

I had tried this.
pSubMenu->ModifyMenu(ID__DELETETHEFRAME, MF_BYCOMMAND|MF_STRING, ID__DELETETHEFRAME, "&Save Selection");
But text didn't change.

Re: Modify the context menu string at runtime.

Nish Nishant3-Aug-02 0:36

Nish Nishant

3-Aug-02 0:36

Puzzling! I managed to modify both the main menu items as well as the sub-menu items using similar looking code.

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: Modify the context menu string at runtime.

JohnnyG3-Aug-02 5:23

JohnnyG

3-Aug-02 5:23

I did it by position on the main menu but I had to call DrawMenuBar() maybe there is an update command for submenus.

Re: Modify the context menu string at runtime.

Neha3-Aug-02 0:27

Neha

3-Aug-02 0:27

Is it possible to modify the sdi window menu (File,edit...) at run time??

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