C / C++ / MFC Discussion Boards

Re: how to call c++ .dll with object file library in vb 6

Naveen13-May-09 19:04

Naveen

13-May-09 19:04

zhiyuan16 wrote:
so how to invoke the c++ member function in one .dll

I guess only c functions exported from the dll can be called from VB.

nave

[OpenedFileFinder] [My Blog]

Re: how to call c++ .dll with object file library in vb 6

zhiyuan1613-May-09 19:54

zhiyuan16

13-May-09 19:54

thanks for your reply. i knew i need to export the c++ dll function first, and then i can call it. but i don't know how to export step by step? i got the dll already. how to export? please help me. thanks a lot

rgds

Re: how to call c++ .dll with object file library in vb 6

Naveen13-May-09 20:15

Naveen

13-May-09 20:15

You can call a c function exported in a c/c++ dll from a VB application. And to export a c function all you have to do is put the following keywords in front of the function to export as shown below

extern "C" __declspec( dllexport ) void AnotherCFunc();

extern "C" - is used to avoid the name mangling

nave

[OpenedFileFinder] [My Blog]

Re: how to call c++ .dll with object file library in vb 6

zhiyuan1613-May-09 20:27

zhiyuan16

13-May-09 20:27

thanks a lot for your help. my one .dll has several classes, so how i can use these funtion properly in vb. thanks a lot

Re: how to call c++ .dll with object file library in vb 6

Naveen13-May-09 20:46

Naveen

13-May-09 20:46

As I said before you cannot call a c++ class's member function from a vb app.

nave

[OpenedFileFinder] [My Blog]

Re: how to call c++ .dll with object file library in vb 6

zhiyuan1613-May-09 20:57

zhiyuan16

13-May-09 20:57

thanks, how i can export the functions of dll step by step? thanks a lot

Re: how to call c++ .dll with object file library in vb 6

CPallini13-May-09 21:20

CPallini

13-May-09 21:20

If you haven't DLL source code then you can't. However, you may develop (with C/C++) a new DLL that will act as wrapper of the original one (i.e. an adapter [^]). For details on building a VB6 callable DLL, see this great article series [^].
Smile | :)

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How to increase size of tool tip in my application.

birajendu13-May-09 9:55

birajendu

13-May-09 9:55

Hi ,
In my application I am using NOTIFYICONDATA structure to show tool tip. here the szTip can only contain 128 charecter. Is there any other way to use more charecters in tool tip?

Thanks in advance.

birajendu
CyberG India
Delhi
India

Re: How to increase size of tool tip in my application.

Randor 13-May-09 10:40

Randor

13-May-09 10:40

birajendu wrote:
Is there any other way to use more charecters in tool tip?

Not using the standard shell32 tooltip. I'm afraid that you will have to use a custom tooltip if you require additional features. There are a few articles here on codeproject which could be used.

CPPToolTip v2.1[^]

Custom ToolTips for MFC Projects[^]

Best Wishes,
-David Delaune

Re: How to increase size of tool tip in my application.

Chandrasekharan P13-May-09 17:26

Chandrasekharan P

13-May-09 17:26

This may help you

http://www.codeproject.com/KB/toolbars/tooltipsindialog.aspx

Re: How to increase size of tool tip in my application.

«_Superman_»13-May-09 19:03

«_Superman_»

13-May-09 19:03

By the way szTip can only contain 64 characters and not 128.

«_Superman_»
I love work. It gives me something to do between weekends.

Can't find a solution for showing more dialog windows.

hrddd13-May-09 8:13

hrddd

13-May-09 8:13

I've got an MFC application writed in c++, it is a dialog-based project. I can't find anywere in the internet a solution for my problem. I've got a dialog window were i created a buttons. Also I've got two others dialog windows. I don't now how to make to open second dialog window when the button in window one will by clicked. I tried everything what i found in the internet and nothing ...
Please if any one can help me. I will be very thankfully if someone can send my or show how to do this.

HrDDD

Re: Can't find a solution for showing more dialog windows.

Maximilien13-May-09 8:53

Maximilien

13-May-09 8:53

in the handler of your button in dialog A (the first dialog), just create the second dialog.

for modal dialog:

void MyDialogA::OnButton()
{
  MyDialogB dlg;
  dlg.DoModal();
  // ...
}

for modeless dialog:

class MyDialogA
{
// ... 
  MyDialogB* m_pDialogB;
}

void MyDialogA::OnButton()
{
  if ( m_pDialogB)
    delete m_pDialogB;
  m_pDialogB = new MyDialogB;
  m_pDialogB->Create(IDD_DIALOG_B/*...*/);
  m_pDialog->ShowWindow(SW_SHOW);
  // ...
}

This signature was proudly tested on animals.

How to calculate the time between LBUTTONDOWN and LBUTTONUP?

wb_program13-May-09 8:04

wb_program

13-May-09 8:04

I can't find any function for calculate the time between LBUTTONDOWN and LBUTTONUP,help me ~ Cool | :cool:

Re: How to calculate the time between LBUTTONDOWN and LBUTTONUP?

JBAK_CP13-May-09 8:30

JBAK_CP

13-May-09 8:30

Here is a generic example on how to get elapsed time:

CTime startTime;
CTime endTime;
CTimeSpan elapsedTime;

On LBUTTONDOWN: startTime = CTime::GetCurrentTime();

On LBUTTONUP: endTime = CTime::GetCurrentTime();
elapsedTime = endTime - startTime;
int timeout = elapsedTime.GetSeconds();

Re: How to calculate the time between LBUTTONDOWN and LBUTTONUP?

Nibu babu thomas13-May-09 18:45

Nibu babu thomas

13-May-09 18:45

wb_program wrote:
I can't find any function for calculate the time between LBUTTONDOWN and LBUTTONUP,help me ~ Cool

Also probably you can use GetCurrentMessage which contains a DWORD value which gives the time the message was posted. Note that you should only call this from event handlers. So call this from mouse up and mouse down.

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Re: How to calculate the time between LBUTTONDOWN and LBUTTONUP?

Taran913-May-09 21:07

Taran9

13-May-09 21:07

You can use 'GetDoubleClickTime' to retreive double click time for your mouse.

Cannot Open Recordset

Astitva2313-May-09 8:00

Astitva23

13-May-09 8:00

char *sConn="C:\\Documents and Settings\\Nimesh Gurung\\Desktop\\VPassignment\\Employee.mdb";
m_ptrConnection.CreateInstance(__uuidof(Connection));
m_ptrConnection->Provider = "Microsoft.Jet.OLEDB.4.0";
m_ptrConnection->Open(sConn,"Admin","",NULL);

//Create Ado recordset
m_pRS=NULL;
m_pRS.CreateInstance(__uuidof(Recordset));
m_pRS->CursorLocation=adUseClient;

char *table="SELECT * FROM EmployeeDetails";

m_pRS->Open(table,sConn,adOpenKeyset,adLockReadOnly , adCmdTable);

/
m_datagrid.putref_DataSource(NULL);
m_datagrid.putref_DataSource((LPUNKNOWN) m_pRS );
//m_datagrid.Refresh();

I am using Visual Studio 2008 and somehow can't make my code to open the recordset. Any help is much appreciated.
Many thanks in Advance

Re: Cannot Open Recordset

Stuart Dootson13-May-09 9:17

Stuart Dootson

13-May-09 9:17

Given the complete and utter lack of error checking, the root cause could be any of the statements before the record set open call. Check the status values to see where the error actually occurs, and then ask your questions...

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Cannot Open Recordset

Astitva2313-May-09 12:10

Astitva23

13-May-09 12:10

my problem solved once I changed the char variable table to just EmployeeDetails but still want the ability to use select for more functionality.

Is it a little bit different in visual studio 2008.

Re: Cannot Open Recordset

Stuart Dootson13-May-09 12:54

Stuart Dootson

13-May-09 12:54

I think it's the adCmdTable parameter - that says the command you're opening is a table. This page[^] documents the other options, while this page[^] suggests you want adCmdText if you want to use a SELECT statement as the command text.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Need help about tab control!!!!!!!!

happy5217713-May-09 4:46

happy52177

13-May-09 4:46

I use a tab control in a dialog which is as a property setup window and put three dialogs into this tab control.Here is the problem,how can i destroy this three dialog and the mian dialog,return to the mian window.

Re: Need help about tab control!!!!!!!!

David Crow13-May-09 10:27

David Crow

13-May-09 10:27

If the dialog is modal, it will get destroyed when you click OK or Cancel.

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Application loses focus

Tommy Svensson13-May-09 4:35

Tommy Svensson

13-May-09 4:35

Hi!

I have an application which sits in the system tray globally listening for a combination key press event (CTRL+ALT+T). Instead of opening the app by right clicking the app icon in the tray bar (clicking Open), I would like to open the app window upon CTRL+ALT+T. When that happens, sometimes (more often than not) the window loses focus/gets inactivated and I manually need to click it to regain focus.

What else besides the following lines of code can be done to force the app foreground, topmost, focused and active?

((CMyAppDlg*) AfxGetApp()->GetMainWnd())->ShowWindow(SW_SHOW);

((CMyAppDlg*) AfxGetApp()->GetMainWnd())->SetFocus();

((CMyAppDlg*) AfxGetApp()->GetMainWnd())->SetForegroundWindow();

Thx!

/T

Re: Application loses focus

Randor 13-May-09 5:30

Randor

13-May-09 5:30

The behavior of the SetForegroundWindow Function[^] can be affected by SPI_GETFOREGROUNDLOCKTIMEOUT as described in the SystemParametersInfo Function[^]

See if this works for you:

HWND hWnd = GetForegroundWindow();
DWORD dwThread = GetCurrentThreadId();
DWORD dwProcessID = GetWindowThreadProcessId(hWnd,NULL);
if(hWnd > 0)
{
	AttachThreadInput(dwProcessID,dwThread,TRUE);
	(AfxGetApp()->GetMainWnd())->SetForegroundWindow();
	AttachThreadInput(dwProcessID,dwThread,FALSE);
}

Best Wishes,

-David Delaune

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