Getting values from EditBox

[bells]

I am worikng on Windows programming
and wants to get the value of an editBox or text box defined as.

hwndPrincipal = CreateWindow(
"EDIT", //name of windwo class
NULL,//title
WS_VISIBLE|WS_CHILD|WS_BORDER |ES_RIGHT|WS_TABSTOP,// WINDOW STYLE NORMAL
260,//x coordinate let window decide
90,//y co
155,//width
45,//height
hwnd,
NULL,
hThisInst, //instance handle
NULL //NO additional arguments
);

I am typing a number and want that number
to use it in a calulaton i tried the following but
did not work

//get the values from text boxes

GetWindowText(hwndPrincipal,principal,NULL);

//then calculate
computeNumber(principal);

I am not getting any error message but the result
i am getting is alway 0
any suggestion is appreciated.

 

[SteveD73]

To get a number from an editbox you can use:

int number = GetDlgItemInt(hwnd, IDC_EDITCONTROL, NULL, FALSE);

In your CreateWindow call your have to add:

,(HMENU)IDC_EDITCONTROL ,

in the HMENU field (and then #define IDC_EDITCONTROL 800 at the top of your program).

Hope that helps.

 

[bells]

i do not think i understand u about
the second part the IDC_EDITCONTROL

u see my EditBox is defined this way and its handle is hwndPrincipal

hwndPrincipal = CreateWindow(
"EDIT", //name of windwo class
NULL,//title
WS_VISIBLE|WS_CHILD|WS_BORDER |ES_RIGHT|WS_TABSTOP,// WINDOW STYLE NORMAL
260,//x coordinate let window decide
90,//y co
155,//width
45,//height
hwnd, //NO parent
NULL, //NO MENU
hThisInst, //instance handle
NULL //NO additional arguments
);
at what point do i introduce the edit box ID
You mentioned above. i can not use hwndPrinicpal
because what the funcion want is an integer value
not a window handle. thank u in advance again.

 

[Guest_imported]

My login handle handle won't work for some reason.

You can assign a control ID to the edit box by using the menu field. For example:


hwndPrincipal = CreateWindow(
"EDIT", //name of windwo class
NULL,//title
WS_VISIBLE|WS_CHILD|WS_BORDER |ES_RIGHT|WS_TABSTOP,// WINDOW STYLE NORMAL
260,//x coordinate let window decide
90,//y co
155,//width
45,//height
hwnd, //NO parent
(HMENU)800, // control ID
hThisInst, //instance handle
NULL //NO additional arguments
);


and then when you want the integer:

int number = GetDlgItemInt(hwnd, 800, NULL, FALSE);

Rather than using the number 800 in your code it would be better to define the number at the top of your code like so:

#define IDC_EDIT_ID 800

Now rather than use 800 you can use IDC_EDIT_ID.