convert number to char - C / C++ / MFC Discussion Boards

HELP problem with CComboBox AddString recovery

cgb1436-Jul-05 14:06

6-Jul-05 14:06

I am trying to maintain someone elses code and do not fully understand it's nuances. However I am trying to recover a string stored in a CComboBox list.

I posted this at little earlier at 19:50 but some of the code was missing/corrupted

//---------------------------------
void Control::DoDataExchange(CDataExchange* pDX)
{
Sheet* pSheet = ((C_App*)AfxGetApp())->getSheet();

MyPropertyPage::DoDataExchange(pDX);
//{{AFX_DATA_MAP(Control)
DDX_Control(pDX, IDC_OTHER_COMBO, m_otherCombo); // IDC_OTHER_COMBO is the CComboBox ID:
//}}AFX_DATA_MAP
}
//---------------------------------

//Sheet::PopulateOtherCombo()
{
int i;
int entry=0;
int index=0;
CString name;
for (i=0;i<maxcount;i++)
{

="" some="" code="" that="" constructs="" the="" string="" 'name'
=""

="" write="" 'name'="" to="" ccombobox
index="getControl()-">m_otherCombo.AddString(name);
if (index != CB_ERR)
{
getControl()->m_otherCombo.SetItemData(index, entry++);
}
}
}

//---------------------------------------------------------------------------
//So far I have built a list of strings stored sequentially by 'index' but how do I recover a string ??
// When I click on the CComboBox, the list opens and I can select any of the entries.

int index = getControl()->m_otherCombo.GetCurSel();

// Gets the index # of the currently selected CComboBox entry.
// Now I want to copy the text of the currently selected entry somewhere else.
// I have the index but there is no GetString(index) function

// HELP!

Thanks for any help you can offer

Charles

Re: HELP problem with CComboBox AddString recovery

Christian Graus6-Jul-05 14:44

Christian Graus

6-Jul-05 14:44

The code gets 'corrupted' because you didn't check the box that says 'Do not treat <'s as HTML tags'. Edit this post so we can see the code, then you may get a reply Smile | :)

Christian Graus - Microsoft MVP - C++

Re: HELP problem with CComboBox AddString recovery

cgb1436-Jul-05 15:13

cgb143

6-Jul-05 15:13

new to the forum. I'll look for it next time. meanwhile Brad Bruce suggested GetLBText. thanks anyway

Re: HELP problem with CComboBox AddString recovery

Brad Bruce6-Jul-05 14:59

Brad Bruce

6-Jul-05 14:59

Try GetLBText(...)

Re: HELP problem with CComboBox AddString recovery

cgb1437-Jul-05 5:28

cgb143

7-Jul-05 5:28

Thqanks Brad

works great Smile | :)

Re: HELP problem with CComboBox AddString recovery

David Crow6-Jul-05 15:44

David Crow

6-Jul-05 15:44

If by 'recover' you mean get the currently selected item in the combobox, I use GetWindowText().

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: HELP CComboBox AddString and recovery

Anonymous6-Jul-05 13:54

Anonymous

6-Jul-05 13:54

sorry some code went missing when I pasted.. here it is again

void Control::DoDataExchange(CDataExchange* pDX)
{
Sheet* pSheet = ((C_App*)AfxGetApp())->getSheet();

MyPropertyPage::DoDataExchange(pDX);
//{{AFX_DATA_MAP(Control)
DDX_Control(pDX, IDC_OTHER_COMBO, m_otherCombo); // IDC_OTHER_COMBO is the CComboBox ID:
//}}AFX_DATA_MAP
}

//-----------------------------------------------------------------
Sheet::PopulateOtherCombo()
{
int i;
int entry=0;
int index=0;
CString name;
for (i=0;i<max_count;i++)
{

=""
="" some="" code="" that="" constructs="" the="" string="" 'name'
=""

="" write="" 'name'="" to="" ccombobox
="" index="getControl()-">m_otherCombo.AddString(name);
if (index != CB_ERR)
{
getControl()->m_otherCombo.SetItemData(index, entry++);
}
}
}

//---------------------------------------------------------------------------
//So far I have built a list of strings stored sequentially by 'index' but how do I recover a string ??
// When I click on the CComboBox, the list opens and I can select one of the entries

int index = getControl()->m_otherCombo.GetCurSel();

// Gets the index # of the currently selected CComboBox entry.
// Now I want to copy the text of the currently selected entry somewhere else.
// I have the index but there is no GetString(index) function

// HELP!

convert number to char

Ista6-Jul-05 12:42

Ista

6-Jul-05 12:42

what function would take

int i = 36;

to a char c?

I'm not an expert yet, but I play one at work. Yeah and here too.

Re: convert number to char

markkuk6-Jul-05 13:06

markkuk

6-Jul-05 13:06

char c = i;

Re: convert number to char

toxcct6-Jul-05 20:25

toxcct

6-Jul-05 20:25

as suggested, char c = (char)i; is correct but can cause a warning as you could lost some data.
char (which mean signed char) can contain values from -128 to +127, so any value of your int that is out of bound would be truncated...

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

Re: convert number to char

Bob Stanneveld6-Jul-05 20:58

Bob Stanneveld

6-Jul-05 20:58

toxcct wrote:
as suggested, char c = (char)i; is correct but can cause a warning as you could lost some data.
char (which mean signed char) can contain values from -128 to +127, so any value of your int that is out of bound would be truncated...

Since an int is 4 times the size of a char, the value will always be truncated! One way to make sure that your value has the same sign bit as the previous int variable is:

c = (i & 0x80000000) ? c | 0x80 : c & 0x7F

Here your test the sign bit i & 0x80000000. Depending on it is set, you set or remove the sign bit from the char.

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Re: convert number to char

toxcct7-Jul-05 0:25

toxcct

7-Jul-05 0:25

when you copy a signed integer (either char, short, int or long), the sign bit is copied too...

so, making this will work without any data loss :

int i = -2;
char c = (char) i;
ASSERT(c == -2);

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

Re: convert number to char

Bob Stanneveld7-Jul-05 1:24

Bob Stanneveld

7-Jul-05 1:24

toxcct wrote:
when you copy a signed integer (either char, short, int or long), the sign bit is copied too...

I just verified it and shame on me...

Thanks for pointing that out!

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Re: convert number to char

dSolariuM6-Jul-05 21:11

dSolariuM

6-Jul-05 21:11

Hi,
You can Use ltoa function.
//////////////////////////
char ch[256];
ltoa(1234,ch,10);
//////////////////////////
cheers.

Message Box Position

tas28266-Jul-05 11:21

tas2826

6-Jul-05 11:21

I have a scenario where the size and position of a warning dialog is inconsistent depending on what is done with a modeless dialog that produces it. I have a modeless dialog that has a combo box that fires a kill focus event. If I tab out of the combo box the warning pops as expected centered over the parent modeless dialog centered both horizontally and vertically.

If I highlight the combo box, then click and drag the modeless dialog by its caption bar the kill focus fires as expected. However, the popup warning is now half the size and off to the left of the modeless dialog that produced it. It appears to be centered on the Windows desktop instead of my application dialog.

I have tried it as MessageBox, AfxMessageBox, and as a custom dialog we use for warnings and errors (Just a MessageBox with some custom bells and whistles). All produce the same weird positioning behavior.

Is this a quirk with MFC or Windows?

Is there any way for me to obtain a handle to a pop up dialog, such as AfxMessageBox and position it myself?

Is there some simple reason/solution I am just not seeing?

The app is written in VC++ 6. This is just an annoyance and does not effect the functionality of the app, it is just bugging me, help.

Thanks,

Troy

easy translation for c# .

Ista6-Jul-05 11:07

Ista

6-Jul-05 11:07

Vector but I would to define a foreach statement

std::vector<cworddata*>::iterator itNum = this->_arrWords.begin();

for(; itNum < this->_arrWords.end();itNum++ )

how would I change it to said like so

foreach( myObject obj in this->_arrWords )

I know I would use a define but what else>

please help.
Nick

I'm not an expert yet, but I play one at work. Yeah and here too.

Re: easy translation for c# .

Christian Graus6-Jul-05 11:17

Christian Graus

6-Jul-05 11:17

No, why would you do such an abomination ? Someone has done it as an article already, if you must try to force the issue. Instead, you should use for_each[^], which will allow you to write a function object to define the action you want to take on each object, using C++ instead of trying to hack it into looking like C#.

Christian Graus - Microsoft MVP - C++

Re: easy translation for c# .

Ista6-Jul-05 11:50

Ista

6-Jul-05 11:50

sorry I didn't know. But this looks perfect.

I'm glad I asked.

Nick

I'm not an expert yet, but I play one at work. Yeah and here too.

Re: easy translation for c# .

Christian Graus6-Jul-05 11:55

Christian Graus

6-Jul-05 11:55

Ista wrote:
I'm glad I asked.

*grin* Glad to help. Sorry if I seemed rude, I just hate overuse of macros Smile | :)

Christian Graus - Microsoft MVP - C++

Changing cursor

Atlence6-Jul-05 10:02

Atlence

6-Jul-05 10:02

Hi!

How to change the screen cursor with a custom cursor?

I don't want to change the cursor into my main window, but for all applications, wherever the cursor is.

Thks in advance!
Appstmd
http://www.atlence.com

Re: Changing cursor

David Crow6-Jul-05 11:04

David Crow

6-Jul-05 11:04

Atlence wrote:
...but for all applications, wherever the cursor is.

Wouldn't you need SetCapture() for this?

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: Changing cursor

Atlence6-Jul-05 23:52

Atlence

6-Jul-05 23:52

This function doesn't work, because it changes only the cursor when it is over my application. I want to change the cursor even if the cursor is out of my window application!

Thks in advance!
Appstmd
http://www.atlence.com

Re: Changing cursor

David Crow7-Jul-05 2:39

David Crow

7-Jul-05 2:39

Normally, only the window under the mouse receives WM_SETCURSOR messages. SetCapture() ensures that your window receives WM_SETCURSOR messages without regard to the position of the mouse cursor. That said, is your window receiving WM_SETCURSOR messages even when the mouse is over other windows?

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: Changing cursor

Atlence7-Jul-05 6:52

Atlence

7-Jul-05 6:52

I call SetCursor () function in my OnInitDialog. But my window only receives WM_SETCURSOR messages when the cursor is over it. Even the controls into my window doesn't receive this message!

Thks in advance!
Appstmd
http://www.atlence.com

Re: Changing cursor

David Crow7-Jul-05 6:56

David Crow

7-Jul-05 6:56

This is just a guess but I think you would call SetCursor() in response to each WM_SETCURSOR received. Doing it once in OnInitDialog() is not sufficient. Have you searched CP and Googled for examples?

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

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