Is UNICODE required for my project - C / C++ / MFC Discussion Boards

Acces from CView to CChildFrame and/or CMyApp

tbrake10-May-06 10:32

10-May-06 10:32

Hi
How can I access public variables of CChildFrame and CMyApp from my CView?

Or:

How to access CChildFrame and CMyApp from any other class?

I tried:

<br />
CMyApp theApp;<br />
theApp.public_data = ...;<br />

but this is not working.

Please HELP me

CU Timen

Re: Acces from CView to CChildFrame and/or CMyApp

C^hris L^osinger10-May-06 11:41

C^hris L^osinger

10-May-06 11:41

you can get the app with AfxGetApp:

CMyApp *pApp = (CMyApp*)AfxGetApp();

this site[^] can show you how to get lists of docs, framewnds, views, etc..

Cleek | Image Toolkits | Thumbnail maker

limit app to one instance

big_denny_20010-May-06 9:39

big_denny_200

10-May-06 9:39

hi all

i have a mfc dialog application in Visual Studio 2005.

How to limit it to one instance ?

thank you.

Re: limit app to one instance

tbrake10-May-06 10:24

tbrake

10-May-06 10:24

Hi
A common way to handle one instance is using an identifier

<br />
BOOL CMyApp::InitInstance()<br />
{<br />
	HANDLE hMutex =  CreateMutex   (NULL, TRUE, "MY APP IDENTIFICATION");<br />
	if (GetLastError() == ERROR_ALREADY_EXISTS)<br />
	{<br />
		AfxMessageBox("Alreay running!");<br />
		return FALSE;<br />
	}<br />
	if(hMutex)		ReleaseMutex (hMutex);<br />
	...<br />
}<br />

CU Timen

Re: limit app to one instance

PJ Arends10-May-06 10:27

PJ Arends

10-May-06 10:27

There are lots of CP articles on the subject. Do a search.

http://www.codeproject.com/info/search.asp?target=single+instance&st=kw&qm=all[^]

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good - Use it!

Re: limit app to one instance

David Crow10-May-06 10:54

David Crow

10-May-06 10:54

See here.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

Re: limit app to one instance

ThatsAlok10-May-06 19:57

ThatsAlok

10-May-06 19:57

big_denny_200 wrote:
How to limit it to one instance ?

http://www.codeproject.com/cpp/csingleinst.asp[^]

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

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Is UNICODE required for my project

benm9999999910-May-06 9:23

benm99999999

10-May-06 9:23

Hi,

We have a C++ service that needs to scan the filesystem and report back an inventory. Some filenames are in Hebrew.

Our project is currently Multibyte, we use CString and CFileFind, and the Hebrew characters are shown as '???'.

Can someone explain if we MUST switch to UNICODE or is there some way to make it work in MBCS ? I was under the impression MBCS also supported other languages. I see I can use CStringW to hold Hebrew chars, but CFileFind still returns '?' characters... Is there a way to define UNICODE locally only for a certain class ? I tried, but CString still isn't UNICODE since afxwin.h is included in the precompiled header.

The problem is switching to UNICODE causes a ton of errors all over the place, and in some classes we downloaded from the web, which used CHAR in some places instead of TCHAR.

I'll appreciate any advice,
Ben

Re: Is UNICODE required for my project

Joe Woodbury10-May-06 10:20

Joe Woodbury

10-May-06 10:20

SBCS and MBCS only work if you know which code page you are working in. You should do this application in UNICODE.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Multi Window With OpenGl

F.Smadi10-May-06 8:33

F.Smadi

10-May-06 8:33

with win32 ...
any one have example ...

How to get Admin rights for the process...

nagamohan_p10-May-06 7:49

nagamohan_p

10-May-06 7:49

Hi
Is it possible to get Admin rights for the process...If not possible, is there any api call for executing "RunAs " command ie, run a command with different user credentials...

Please suggest me how to get admin rights for the non-admin user...

Best regards,
nag.

Re: How to get Admin rights for the process...

Maxwell Chen10-May-06 8:09

Maxwell Chen

10-May-06 8:09

Privileges[^] explained.

Sample code[^].

Maxwell Chen

Dll Debuging?

G Haranadh10-May-06 7:40

G Haranadh

10-May-06 7:40

Is it possiable to debug a dll?
How to do it. can any one help me with links.
Thanks.

Nice talking to you. Blush | :O

If you judge people, you have no time to love them. -- Mother Teresa

Re: Dll Debuging?

Maxwell Chen10-May-06 7:45

Maxwell Chen

10-May-06 7:45

G Haranadh wrote:
to debug a dll?

Not quite sure but
1) DLL has to be a debug-build one.
2) Debugger has to locate the .pdb file which came from building the DLL.
3) Source code (not sure)...

Maxwell Chen

Re: Dll Debuging?

Rick York10-May-06 8:05

Rick York

10-May-06 8:05

Yes - those three things are all needed. Another thing needed is an application to host the DLL and "exercise" its exported functions, classes, and resources.

What I usually do when I am debugging a DLL is make it a subproject of the app's solution. I find that it becomes easier to make changes and rebuild both the app and the library when I do this.

Re: Dll Debuging?

Maxwell Chen10-May-06 8:12

Maxwell Chen

10-May-06 8:12

I manage my project this way:

[Folder hierarchy]

<br />
.\exe\<br />
.\dll_a\<br />
.\dll_b\<br />
.\dll_c\<br />
.\sys_a\<br />
.\sys_b\<br />

Maxwell Chen

Re: Dll Debuging?

NiceNaidu10-May-06 19:24

NiceNaidu

10-May-06 19:24

Here I am giving the step by step procedure to debug a DLL.

For simplicity ,assume the DLL name is test.dll and application that is using the Dll is testapp.exe.

In the vc6
1.open the dll source
2.Project->Settings and goto Debug tab,
3.Under executable for debug section, browse the testapp.exe.
4.under link tab,output file name path shoud be the same path as that of the exe path.
5.Now you can start debugging , by keeping breakpoints.

Hope this helps.

AppU..

query on Database support

swapna_signsin10-May-06 6:20

swapna_signsin

10-May-06 6:20

Hi,
How do I use the database connection in modal dialog boxes when I've created the connection in OnInitDialog() of main dlgbox.
Iam able to dynamically retrieve the records from a database in main dlgbox,but failed to do so when there are multiple dlgboxes with continuity.
I've included the header file of main dlgbox,it doesn't work.

Thanku..

swapna_signsin

Re: query on Database support

Maxwell Chen10-May-06 6:39

Maxwell Chen

10-May-06 6:39

How are you using the connection handle(s)?

Maxwell Chen

Re: query on Database support

swapna_signsin10-May-06 23:56

swapna_signsin

10-May-06 23:56

Hi,
I've just a generic class and used CreateConnection method.I've used CDatabase and CRecordset objects.

Re: query on Database support

voorugonda prashanth10-May-06 18:35

voorugonda prashanth

10-May-06 18:35

hi swapna,
can u post some code?

Regards,
Prashanth.v

Re: query on Database support

David Crow11-May-06 2:35

David Crow

11-May-06 2:35

I'm a bit confused as to what the problem is. You should have a class derived from CRecordset, and a member variable of that type in your dialog class.

swapna_signsin wrote:
...multiple dlgboxes with continuity.

What does this mean?

swapna_signsin wrote:
I've included the header file of main dlgbox,it doesn't work.

The presence/absence of a header file is going to affect the compiler. Are you having a compiler or a runtime error?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

Re: query on Database support

swapna_signsin11-May-06 3:41

swapna_signsin

11-May-06 3:41

Hi,
Nothing like multiple dlgboxes,Imeant modal dlgboxes.
Now,,my problem is,Iam not able to retrieve records into these modal dlgboxes,while I get them inti main dlgbox.
I didn't get any errors,its just showing empty boxes.

To be more precise say if there r 2 dlgboxes,dlg1 & dlg2,in which dlg1 is main dlgbox,with OnInitDialog(),I've made all connections using DSN,SFile,CDatabase object etc. in this.
Iam able to retrieve records ,offcourse using certain methods.
But,I can't retrieve the records into dlg2 dlgbox,while I use the same methods to retrieve ,say LoadProjects().

I hope U got it.

swapna_signsin

Re: query on Database support

David Crow11-May-06 3:49

David Crow

11-May-06 3:49

If the dialogs are modal, only one of them can be active at a time. Each control on the dialog will need a member variable (e.g., CEdit, CStatic) associated with it. Use the SetWindowText() method to update the control with data from the record set.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

Re: query on Database support

swapna_signsin11-May-06 4:21

swapna_signsin

11-May-06 4:21

Hi,
Here I send the code written.This works in main dlgbox(dlg1),but displys empty boxes in dlg2 dlgbox.

//This is used for connection//

void CClientsDlg::CreateConnection(CString czDBPath)
{
_glbDB.sDriver ="MICROSOFT ACCESS DRIVER (*.mdb)";
_glbDB.sFile = czDBPath;
_glbDB.sDsn.Format("ODBC;DRIVER={%s};DSN='';DBQ=%s",_glbDB.sDriver,_glbDB.sFile);
_glbDB.database.Open(NULL,false,false,_glbDB.sDsn);
}

//method to retrieve data dynamically from a database
void CClientsDlg::LoadProjects()
{
CString czProjName;
CString lProjID;
CString SqlString;

CRecordset recset( &_glbDB.database);
// Build the SQL statement

SqlString = "SELECT * from tbl_Project order by ProjectName";
recset.Open(CRecordset::forwardOnly,SqlString,CRecordset::readOnly);
m_cboProject.ResetContent();
while( !recset.IsEOF() )
{
// Copy each column into a variable
recset.GetFieldValue("ProjectID",lProjID);
recset.GetFieldValue("ProjectName",czProjName);

// Insert values into the list control
m_cboProject.SetItemData(m_cboProject.AddString(czProjName),atol(lProjID));
// goto next record
recset.MoveNext();
}
// Close the database
recset.Close();
}

swapna_signsin

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