Reading from and write to a text box

[hmm]

O.S: Win98
Compiler: Dev-C++ version 4
Level: keen newbie

Hello,

I've created a text box (thanks to Vlatko and Steve) using CreateWindowEx function. I now need to know how you read from and write to the control.

Thanks

[parksie]

SetWindowText(hEditCtl, "Text here!");

char *pcBuf;
int iLen = GetWindowTextLength(hEditCtl);
pcBuf = new char[iLen + 2];
GetWindowText(hEditCtl, pcBuf, iLen + 1);
// use pcBuf, then delete it
delete[] pcBuf;

[Vlatko]

You can also send the WM_SETTEXT message. First get the textlength by sending the WM_GETTEXTLENGTH message:

WM_SETTEXT
An application sends a WM_SETTEXT message to set the text of a window.

WM_SETTEXT
wParam = 0; // not used; must be zero
lParam = (LPARAM)(LPCTSTR)lpsz; // address of window-text string

Parameters
lpsz
Value of lParam. Pointer to a null-terminated string that is the window text.
Return Values
The return value is TRUE if the text is set. It is FALSE (for an edit control), LB_ERRSPACE (for a list box), or CB_ERRSPACE (for a combo box) if insufficient space is available to set the text in the edit control. It is CB_ERR if this message is sent to a combo box without an edit control.

But the result is the same.

[hmm]

Thanks parksie and Vlatko

[Chris]

If you're dealling with Dialog, you can use the SendDlgItemMessage or SetDlgItemText Api function call, so, all you need to know is the control ID and not the handle (HWND)

// Read the string from IDC_EDIT control
int    sz=0;
char    *str;

sz = SendDlgItemMessage(hDlg, IDC_EDIT1, WM_GETTEXTLENGTH, 0, 0);
sz = sz+1;
str = new char[sz];
memset(str, 0, sz);
SendDlgItemMessage(hDlg, IDC_EDIT1, WM_GETTEXT, sz, (LPARAM)str);
MessageBox(hDlg, str, NULL,  MB_OK);
delete [] str;


// Write a new string into IDC_EDIT control
SetDlgItemText(hDlg, IDC_EDIT1, "TESTING"); 

regards,

[hmm]

Thanks Chris

[rms10]

Chris,

How would one adapt this for use in VB ?

[parksie]

txtMyTextBox.Text = "whatever"