C / C++ / MFC Discussion Boards

18-Jun-02 4:36

I have a COM object that starts Microsoft Word and opens a word document. The user can make any modifications to the docunment. I added a special button that is going to be used to save the document and exit Microsoft Word. Unfortunately, I am not sure how to capture the event to know the button has been hit. I have looked through the posts and articles and there is a lot of information if you are an ATL server. But this is an MFC-based COM object and is not an ATL server. Does anyone know what do I need to do, in plain english, to determine when my button has been hit. Am I going to have to make it an ATL server to get the event and if so, how do I do that?

PLEASE HELP!!!!!

Confused | :confused:

VS.NET _bstr_t flawed?

mstephens18-Jun-02 3:47

mstephens

18-Jun-02 3:47

Is it me or is the latest implementation of the _bstr_t class flawed in Visual Studio .NET?

I have a class that has an internal member of type _bstr_t. During construction the _bstr_t classes default constructor runs and sets it's internal m_Data pointer to NULL.

Later i call a function with a BSTR parameter and use the _bstr_t::Assign method to copy the BSTR into my member variable. Under VS6 this code was fine but under VS.NET it crashes.

The reason for the crash is in an ASSERT where the expression is something like (m_Data->GetWString() != s) since m_Data is NULL it crashes! Since it's in an assertion i can compile to a release build and it works ok.

Has anyone else seen this and is there any kind of service pack for VS.NET that fixes the problem?

Release the memory associated with the element at the head position

Rsh18-Jun-02 3:35

Rsh

18-Jun-02 3:35

I wan to release the memory in CList associated with the element at the head position after reading it. will the RemoveHead() does that? If so, in my application, after reading from the CList, memory usage is not reduced. How to go about it.
Here is the code for reading the CList

void CPLayerApp::ReadFromList()
{
unsigned char data[10],mCnt,mMid;
CMessage* pMess;
CSingleLock singleLock(&m_SyncLock.m_mutex);

CString str="";
while(1)
{
if(m_messList.GetCount() != 0)
{
singleLock.Lock();
pMess = &m_messList.GetAt(m_messList.GetHeadPosition());

mCnt = pMess->m_cnt;
mMid = pMess->m_mid;
pMess->GetData(data);
POSITION pos = m_messList.GetHeadPosition();
m_messList.RemoveHead();
singleLock.Unlock();
if(data[0] == 0x10)
{
str.Format("%0x",data[0]);
AfxMessageBox(str);
break;
}
}
Sleep(200);

}

}

UINT WriteToListThread(LPVOID pParam)
{

CPLayerApp* pPLayerApp = (CPLayerApp*)pParam;

CMessage* pMsg = new CMessage();// = pPLayerApp->m_message;
CMsgList* m_messList = &pPLayerApp->m_messList;
CSyncLock* pSynLock = &pPLayerApp->m_SyncLock;
CSingleLock singleLock(&pSynLock->m_mutex);

unsigned char cnt=3;
unsigned char mid=2;
unsigned char data[14];
data[0]=0x04;
bool bWrite=TRUE;

while(1)
{
if(bWrite)
{
singleLock.Lock();
pMsg->SetValues(cnt,mid,data);
m_messList->AddTail(*pMsg);
singleLock.Unlock();
data[0] += 1;
if(data[0]==0x11)
{
AfxMessageBox("Test");
bWrite=FALSE;
}
}

Sleep(500);
}
return 0;

}

Rsh

Missing dialog icon in ALT-Tab list

18-Jun-02 2:38

Hi, I create a Win32 dialog (as usual with RegisterClass() + CreateWindowEx() etc).

The dialog itself shows an icon, but when I press ALT+Tab I see no icon. Anything I missed? Thx for help!

Re: Missing dialog icon in ALT-Tab list

Mike Nordell18-Jun-02 6:50

Mike Nordell

18-Jun-02 6:50

Anonymous wrote:
The dialog itself shows an icon, but when I press ALT+Tab I see no icon. Anything I missed?

Nope, this is "By Design". A firetruckin' stupid design if you ask me (and I've only heard similar negative statements re. this, never one nice word about it).

Re: Missing dialog icon in ALT-Tab list

18-Jun-02 8:22

Mike Nordell wrote:
Nope, this is "By Design".

there is nothing I can do against? Hmm, like handling a message...?

Re: Missing dialog icon in ALT-Tab list (solved)

18-Jun-02 10:04

I needed to set the icon for the parent window, a MFC frame window which creates all other (MFC or WIn32 dialogs). Once the icon for the parent is set all child dialogs are shown with this icon in the ALT-TAB list.

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
		return -1
	//  Set main frame icon (it's used for ALT-TAB list)
	SetIcon(AfxGetApp()->LoadIcon(IDR_ICON_DEFAULT), TRUE);
	// Add more stuff here (creating dialogs etc)
}

Re: Missing dialog icon in ALT-Tab list (solved)

18-Jun-02 10:06

PS: Needless to say WinAPI can drive you crazy sometimes Smile | :)

Changing Windows colors not handled in ownerdraw buttons

18-Jun-02 2:34

Hi, when I'm changing Windows colors, my ownerdraw buttons (CBtnST)do not handle this. Which message do I need to handle? Thx for help.

Re: Changing Windows colors not handled in ownerdraw buttons

James R. Twine18-Jun-02 3:10

James R. Twine

18-Jun-02 3:10

   Have you looked into the:
      WM_SYSCOLORCHANGE
      WM_SETTINGCHANGE
      WM_WININICHANGE
   Messages?  They should be a good starting point...

   Peace!

-=- James.
"Some People Know How To Drive, Others Just Know How To Operate A Car."
[Get Check Favorites 1.4 Now!]

Re: Changing Windows colors not handled in ownerdraw buttons

18-Jun-02 6:08

Anonymous wrote:
my ownerdraw buttons (CBtnST)do not handle this.

Here is the patch Smile | :)

void CButtonST::OnSysColorChange() 
{
	CButton::OnSysColorChange();
	SetDefaultColors(TRUE);  //<------NEW

	m_dcBk.DeleteDC();
	m_bmpBk.DeleteObject();	
} // End of OnSysColorChange

CMDIFrameWnd in CMDIChildWnd view

thkoch18-Jun-02 2:27

thkoch

18-Jun-02 2:27

Is there a way to create a CMDIFrameWnd in a CMDIChildWnd view.

My firts idea was to create a CFormView with a static control an then create a new CMDIFrameWnd on this (static) CWnd.
Second idea was to create the CMDIFrameWnd directly while creating the (CMDIChildWnd) view.

I can't find in the documentation if you can have more than one CMdiFrameWnd in an app without causing some kind of problem. But I also can't find that you can't do this anywhere.

Any help would be greatly appreciated.
Samplecode also.....

Thorsten Koch

BTW: I don't want splitter windows

_________________________________________

"If Microsoft ever does applications for
Linux, it means I've won."
- Torvalds, creator of Linux OS -

flexgrid woes

yeeeooowww18-Jun-02 2:23

yeeeooowww

18-Jun-02 2:23

I desperately need a grid control that I need to use to dsplay data..I have no use to bind it to a data contorl or the likes...I need to display content from the serial port in the grid...
the problms is that I need to resize the grid depending upon the incoming data. so I need to dynamically change no of rows and cols and I want to resize the size of the grid to the exact size of rows adn cols....
since, valued such as GetColWidth() and GetGridLineWidh() are in twips, I need some way to converte them to pixels in VC...
can some1 tell me how I get the current scale of Twips-Pixels (using either GetDeviceCaps() or GetSystemMetircs() )
in VC++?
thks
Eek! | :eek:

If you want a helping hand, you'll find one at the edof your arm.

Re: flexgrid woes

Michael P Butler19-Jun-02 1:15

Michael P Butler

19-Jun-02 1:15

yeeeooowww wrote:
I desperately need a grid control that I need to use to dsplay data
http://www.codeproject.com/library/gridprojects.asp

Michael Smile | :)

"Eureka" is Greek for "This bath is too hot"

On dialog box move....

newneo18-Jun-02 2:02

newneo

18-Jun-02 2:02

Hello Friends

Hi ! there,,,need some help,,i hope someone will comeforward,,,
This is stupid question i know but still i want to know where i am wrong.

I have a SDI application with map displaying on that having some symbols,,,and a dialog box where uneditable related information is displayed,,,

Whenever i move the Dialog box in the Background the Map is getting effected i.e i have few symbols which are disappearing randomly,,,

I tried to fix the bug ,initially by WM_MOVE method for that dialog.,,but the problem is that it is not at all displaying any changes,,i tried first for a mere message box,,but stil it is not working,

Can any one ple solve this,,

Thanks in advance

Bye

Thanks & Regards
Neonave

Re: On dialog box move....

perlmunger19-Jun-02 9:59

perlmunger

19-Jun-02 9:59

Your English is a little broken so it's a bit difficult to understand your problem. If it's a drawing problem that you're having, take a look a the OnDraw method. If you want to make your window update the drawing region after a dialog (or any other window for that matter) obstructs it, OnDraw is where you should place the drawing code. If you are doing some drawing outside of the OnDraw method, that is OK, you just have to ensure that OnDraw knows the last state of the drawing area.

I'm not sure I'm on the right track here, so let me know if this sounds helpful. The "symbols" you speak of may be disappearing because you're not re-drawing them. Not sure what's going on exactly, though. Can you clarify?

-Matt

------------------------------------------

The 3 great virtues of a programmer:
Laziness, Impatience, and Hubris.
--Larry Wall

Handling dynamically added toolbar button events...

Mohit Khanna18-Jun-02 1:49

Mohit Khanna

18-Jun-02 1:49

Hi All,

The prob is as under:

I have a main app... lets name it "MainApp"... and a DLL named "PlugIn1"..

When I clck on one of the menu optins in the main app's window, DLL's InitPlugIn Function is called, where a new toolbar button is created... that is , a new button is appened, to the default toolbar of the main app...

I have mentioned the button state as TBSTATE_ENABLED, but still it is not enabled.... It appears as disabled...

I am using doc/view arch...

and VS7

also, one more prob, where to handle it's event... whether in the DLL or main app???

I have tried handling it in main app's Mainframe --->> OnCommand () handler... but no event is generated, when i click on this button... may be because it is disabled....

So my main prob is how to enable that button...
Please do help me... it's kinda urgent...

Thanks in advance,
Mohit Khanna Confused | :confused:

Re: Handling dynamically added toolbar button events...

dazinith18-Jun-02 4:02

dazinith

18-Jun-02 4:02

toolbar buttons will normally appear dimmed out if they do not have a message handler associated with them, so it sounds like the real problem is where to handle it, as once the event is handled the button should not be dimmed out.

make sure that you have the right ID for the button that is created, since the button is added to a toolbar that is a member of CMainFrame i would assume that the command should be in the CMainFrame's message map..

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
ON_COMMAND(ID_OPTIONS, OnOptions)
END_MESSAGE_MAP()

wish i could help more.. but im a newbie..

-dz

Re: Handling dynamically added toolbar button events...

Mohit Khanna18-Jun-02 4:09

Mohit Khanna

18-Jun-02 4:09

Hi Dazinith,

Actually in your way you are right... Messages for the toolbar can be handled in CMainFrame class... but the actual prob is that... One or more buttons are added to the toolbar dynamically by the DLL... so the CMainframe class does not know before-hand about the buttons... also the resource ID for the button may be DLL dependent... so the ideal place to handle that button's functionality is in the DLL itself...

It may be that DLL be written by a third party who does not know about CMainFrame's code... so in that way..

the application can be very flexible... so how to do that???

till know the status is.. button is being displayed... on the toolbar...
but is disabled....
how to specify the message handler... i have tried it but it still isn't being enabled...
IS it regarding to the resources???

Please someone help me on this... it's really bugging me ...

Thanks in advance...
Mohit Confused | :confused:

How to set IP address on Windows NT/2000?

18-Jun-02 1:17

How do I set/change an IP address on Windows NT/2000 using the Windows API by C/C++ code?

Image Display

sikanderrafiq18-Jun-02 0:56

sikanderrafiq

18-Jun-02 0:56

How can i display .bmp file on 300 DPI rather than 72dpi ( as window by
default shows images on 72dpi). OMG | :OMG:

Sikander

Re: Image Display

Christian Graus18-Jun-02 1:14

Christian Graus

18-Jun-02 1:14

What the hell are you talking about ? The d in dpi is dots, i.e. the number of pixels in your image. If you want it smaller on the screen, use StretchBlt.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Half the reason people switch away from VB is to find out what actually goes on.. and then like me they find out that they weren't quite as good as they thought - they've been nannied. - Alex, 13 June 2002

Re: Image Display

Tommy Svensson24-Jun-02 6:24

Tommy Svensson

24-Jun-02 6:24

Christian Graus wrote:
What the hell are you talking about ?

Please, don't be rude when answering posts! What purpose does it serve other than that people get scared and intimidated...?

Be well,

/T

Re: Image Display

C^hris L^osinger18-Jun-02 1:46

C^hris L^osinger

18-Jun-02 1:46

you can use SetWindowExt/SetViewportExt to change the effective DPI of the display.

// draw at 300-dpi
pDC->SetMapMode(MM_ISOTROPIC); 
pDC->SetWindowExt(CSize(300,300)); 
pDC->SetViewportExt(pDC->GetDeviceCaps(LOGPIXELSX), pDC->GetDeviceCaps(LOGPIXELSY));
..
..
// draw at 72-dpi
pDC->SetMapMode(MM_ISOTROPIC); 
pDC->SetWindowExt(CSize(72,72)); 
pDC->SetViewportExt(pDC->GetDeviceCaps(LOGPIXELSX), pDC->GetDeviceCaps(LOGPIXELSY));

as long as you set the Window Extent to your image's DPI, the image will be drawn at the correct size.

-c

Cheap oil. It's worth it!

Image Processing - just like mom used to make.

Re: Image Display

Christian Graus18-Jun-02 1:59

Christian Graus

18-Jun-02 1:59

Say wha ? How can that have any meaning at all ?

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Half the reason people switch away from VB is to find out what actually goes on.. and then like me they find out that they weren't quite as good as they thought - they've been nannied. - Alex, 13 June 2002

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