C / C++ / MFC Discussion Boards

ThatsAlok26-Jan-05 1:08

26-Jan-05 1:08

catch the Right Button Click on CListCtrl and using TrachPopupMenu api display the Menu on the CListCtrl.

just Check the documentation of TrackPopupMenu in local copy of MSDN it's contain the example for displaying the popupmenu

"I Think this Will Help"
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Re: Right click on CListCtrl item

ameii8330-Jan-05 17:09

ameii83

30-Jan-05 17:09

i have add this command from msdn library, but it have some errors...

void CMCSProjectDlg::OnRButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
CView::OnRButtonDown(nFlags, point);

CMenu* menu_bar = AfxGetMainWnd()->GetMenu();
CMenu* file_menu = menu_bar->GetSubMenu(0);
ASSERT(file_menu);

file_menu->TrackPopupMenu(TPM_LEFTALIGN |TPM_RIGHTBUTTON, point.x,
point.y, this);

}

ERROR:

error C2248: 'OnRButtonDown' : cannot access protected member declared in class 'CWnd'

: see declaration of 'OnRButtonDown'

: error C2352: 'CWnd::OnRButtonDown' : illegal call of non-static member function

: see declaration of 'OnRButtonDown'
Error executing cl.exe.

What d' problem Cry | :((

??

Nobody is Lonely

How to know when the dialog is activated?

freehawk25-Jan-05 14:45

freehawk

25-Jan-05 14:45

Hello everyone.

I have a dialog attached in a frame, the propery of dialog is "child", in the dialog there are some edit boxs, comboboxs and buttons. When these controls in dialog got focus, I want to catch the active event. I tried to add WM_ACTIVE to dialog, but it can not be called. How to know when the dialog is activated?

Thanks.

-Freehawk

Re: How to know when the dialog is activated?

pc_dev25-Jan-05 17:23

pc_dev

25-Jan-05 17:23

When these controls in dialog got focus, I want to catch the active event.

for that u can use EN_KILLFOCUS and EN_SETFOCUS events of edit box

connecting to a SQL/MSDE database

elephantstar25-Jan-05 13:17

elephantstar

25-Jan-05 13:17

How can I connect to a SQL/MSDE database. I figured I couldn't use CDaoDatabase since it's not an Access database that I want to connect to. Is this the connection I should use?

strConnect = _T("Provider=sqloledb;Data Source=MyServerName;"
"Initial Catalog=MyDatabaseName;"
"User ID=myUsername;Password=myPassword;");

Now how do I use this string to connect and query my database?

Thanks!

Re: connecting to a SQL/MSDE database

wilsonian26-Jan-05 10:59

wilsonian

26-Jan-05 10:59

Have you considered using ADO?

Re: connecting to a SQL/MSDE database

elephantstar27-Jan-05 11:05

elephantstar

27-Jan-05 11:05

Yes but isn't using ADO in C++ very complex? My program isn't COM-based so it may be a little difficult to implement. Are there other alternatives to using ADO?

Re: connecting to a SQL/MSDE database

wilsonian27-Jan-05 11:26

wilsonian

27-Jan-05 11:26

I'm using ADO in my app and to be honest I don't even know what COM is. I didn't find it very difficult, I'm not aware of easier alternatives (but I'm no expert). This article was very helpful to me:

http://www.codeproject.com/database/simpleado.asp[^]

If you have any more questions I'd be glad to help but we should probably move this over to the SQL/ADO/ADO.NET message board.

Re: connecting to a SQL/MSDE database

elephantstar27-Jan-05 14:05

elephantstar

27-Jan-05 14:05

Thanks Wilsonian! I'll try it out and if I'm still having problems I'll post it in the SQL/ADO/ADO.NET board. Thanks again!

CDaoDatabase error

Deian25-Jan-05 12:22

Deian

25-Jan-05 12:22

Hello,
I'm using the following code to create database programatically, and it works only on WinXP, it crashesh on win98/ME/2000:

CDaoDatabase db;<br />
db.Create(_T("tmp.udb"));<br />
CDaoTableDef TableDef(&db);<br />
TableDef.Create(_T("Addresses"));<br />
TableDef.CreateField(_T("AddressID"), dbLong, 4, dbAutoIncrField);<br />
TableDef.Append();<br />
db.Close();

with error from daocore.cpp -> line:453

What am I doing wrong?

How to get size of dynamic array

r3dqu33n25-Jan-05 10:23

r3dqu33n

25-Jan-05 10:23

Im looking for a method of get the effective size of a dinamic array created with the new statement, because the sizeof instruction only gives me the size of the pointer or the size of the first element of the array, maybe that i don't know how use that, but i really want to know the size of an array without having the number of elements of the array, (if it's posibble) the same as UBound property in VB6.

PS: excuse if this text is a little confuse, i'm from argentina and my english is basic.

Thanks

Re: How to get size of dynamic array

Budric B.25-Jan-05 10:45

Budric B.

25-Jan-05 10:45

Either the class that you use to create your dynamic array has member functions to check the size, or it doesn't. What class are you using to create your dynamic array?

Re: How to get size of dynamic array

r3dqu33n26-Jan-05 0:31

r3dqu33n

26-Jan-05 0:31

What i want to do is something as:

char c[255];
int size;

int * myArray=new c;
size=Ubound(myArray); // this is the function what i like

// I do it any times and i want to know it size
// I need to know the lenght of the array, then i know if i can add another
// to the array.

Re: How to get size of dynamic array

geo_m26-Jan-05 1:29

geo_m

26-Jan-05 1:29

The C++ inside me says:
Better to use some class for holding the array (what about ready-to-use stl::vector?) that could return you the size of the array by using something line myArray.size()? You will also get the automated memory management included and many more other stl usefull functions.

The C devil says:
on most compilers, the size of the array is stored at some negative offset of the array (but differs on compilers, also can differ on compiler versions etc - simply don't try it at home, it's ugly ugly ugly hack - just mentioned in case of emergency)

Re: How to get size of dynamic array

David Crow26-Jan-05 3:08

David Crow

26-Jan-05 3:08

What you are after is not possible. You could pull it off while in debug mode, but the same trick would not work in release mode.

When you dynamically allocate memory, the amount requested is usually stored in a variable or a #define directive.

char *buff = new char[255];

Now whenever buff is used by other functions, the value 255 must also be sent to those functions. Make sense?

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

Convert CString

RedDragon2k25-Jan-05 8:48

RedDragon2k

25-Jan-05 8:48

Hi Guys

I have to convert a IP-Address which is a CString to an UInt, but i have no clue how to do this. Also i must convert a Port CString to an UInt.

MFG
RedDragon2kx

Unix and C are the ultimate computer viruses.

Re: Convert CString

toxcct25-Jan-05 9:52

toxcct

25-Jan-05 9:52

don't you use a class that use ip addresses, and in which some function take a string (either char* or std::string or CString...) ?

else, you might write your own function that test first the validity of the address, and then, extract it to a UInt...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: Convert CString

Bob Ciora25-Jan-05 12:26

Bob Ciora

25-Jan-05 12:26

You can sscanf the string like so:

CString sIPAddr;
UINT nByte1, nByte2, nByte3, nByte4;
UINT nPort;
DWORD dwIPAddr;
int nArgs = sscanf( (LPCTSTR)sIPAddr, "%d.%d.%d.%d:%d",
                    &nByte1, &nByte2, &nByte3, &nByte4, &nPort );
if( nArgs != 5 )
{
  // Didn't extract 5 valid numeric arguments...take action!
}
else
{
  // Validate that the nByte<x> are valid 0-255.
  ...
  ...
  // Pack the IPAddress into the DWORD.
  dwIPAddr = (nByte1 << 24) + (nByte2 << 16) + (nByte3 << 8) + nByte4;
}

You may want to verify my byte ordering (nByte4 may be the high byte) when building the dwIPAddr, but this should do the trick.

Bob Ciora

Re: Convert CString

RedDragon2k26-Jan-05 5:29

RedDragon2k

26-Jan-05 5:29

Thx. That fixed my problem. D'Oh! | :doh:

Unix and C are the ultimate computer viruses.

Re: Convert CString

digwizfox13-Apr-05 7:08

digwizfox

13-Apr-05 7:08

For future reference, take a look at the inet_addr function in the MSDN library. I can't believe there isn't built in global c runtime functions for parsing an IP address in this day and age. But if you are programming with MFC or windows, you can use this windows function.

I hate the sscanf method myself. It seems wonderful on paper but there seem to be all kinds of weird issues when I try to use it. It never worked well for me as a validation tool for any kind of number. I always use the cruntime methods such as strtod for taking strings and validating them as actual numbers and converting them into an int value (for instance). Unfortunately, I don't see a c-run time method for IP addresses that would be more portable. Since I am a windows programmer, I have to settle for the windows libraries to provide this capability.

Shawn

Outputting to MFC Dialog Box

CNewbie25-Jan-05 8:35

CNewbie

25-Jan-05 8:35

Question. I have been doing c++ code for sometime now but only in console code. I am starting now to use MFC and I wanted to convert my old Console code into GUI MFC code. My Code relies heavily on Stream I/O with strings and character arrays, but I am having a problem getting my character arrays to output to my GUI correctly. I keep getting assertion errors when when running the program (NOTE: the program compiles error free).

Here is an example of what works:

void CParserDlg::OnParse()
{
char key[16]; //Make Array "Key"
strcpy(key, "Text Here"); //Copy "Text Here" into array
UpdateData(TRUE); //
m_strkey.Format(key); //Send String to Dialog Box
UpdateData(FALSE); //
}

This works fine and outputs the string "Text Here" to the dialog box. Now if I try and output 1 character and not the whole thing I get an assertion error:

void CParserDlg::OnParse()
{
char key[16]; //Make Array "Key"
strcpy(key, "Text Here"); //Copy "Text Here" into array
UpdateData(TRUE); //
m_strkey.Format(key[2]); //<------- Send String to Dialog Box
UpdateData(FALSE); //
}

Notice key[2] instead of just key. Not sure why it will not let me just output 1 character.

Thanks

Re: Outputting to MFC Dialog Box

Wes Aday25-Jan-05 9:34

Wes Aday

25-Jan-05 9:34

I am going to go out on a limb here. Someone please correct me if I am wrong.

The first example works because a CString can be assigned the value of a character array:

m_strkey = key;

BUT a CString does not know what to do with a single character from an array. If you want to use the second example try:

m_strkey.Format("%s", key[2]);

Artificial intelligence is no match for natural
stupidity.

Re: Outputting to MFC Dialog Box

Bob Ciora25-Jan-05 11:02

Bob Ciora

25-Jan-05 11:02

Actually, the assignment operator works for both strings and characters, as per the MSDN documentation.

So you can simply do a:

m_strKey = key;
...
...
m_strKey = key[2];

As mentioned in the other reply, CString::Format is CString's version of sprintf(). You can use it to assign a string (as you did), since it didn't have any formatting characters in it. But CString is flexible enough that you can simply assign directly via =.

Bob Ciora

Re: Outputting to MFC Dialog Box

toxcct25-Jan-05 9:57

toxcct

25-Jan-05 9:57

you are using CString::Format() the wrong way.

if you know about printf(), use Format() exactly the same...

so, if you want to print a single character, use Format("%c", key[2]);...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: Outputting to MFC Dialog Box

CNewbie25-Jan-05 13:06

CNewbie

25-Jan-05 13:06

Thank you gentlemen. I never familiarized myself with printf() as I always used cout and cin for my Stream I/O before.

Again thank you.

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