C Under Windows Problem

Hello Its Not Related To PHP I Need Some help In C
I am Trying to Create Windows Programs With C
Would Anyone lease Tell Me How To Get The Text In a edit box ??
And This Is The Edit Box

Code:

C:
.............................................................
hwndEdit = CreateWindowEx(WS_EX_CLIENTEDGE,
      "EDIT",
      "",
      WS_BORDER|WS_VISIBLE|WS_CHILD|ES_MULTILINE|ES_AUTOVSCROLL|WS_VSCROLL,
      0,0,370,200,
      hwndMain,
      NULL,
      hInst,
      NULL);
...................................................

I Wanna Track The Text In The Edit Box When Someone Clicks On A Button
C:

Code:

..................................................................
	case WM_LBUTTONDOWN:
		m_edit_val = hwndEdit.dwStyle;
		MessageBox(0,"Text On The Edit box Would Be Here","Title",MB_OK);
		break;
........................................................

So How Can I Do It ??

My CPP File Has Been Attached

Hi. You can get text from a control using GetWindowText. Here is a simple example:

Code:

char edit_text[512];
GetWindowText(hwndEdit, edit_text, 512);

Oh! Ya
Now I Understand
GetWindowText Justs gets The Texts And Put It In a Var.
So If I Use

Code:

char* edit_text[];
GetWindowText(hwndEdit, edit_text, strlen(edit_text));

Would It Work ??

Originally Posted by neel_basu

Oh! Ya
Now I Understand
GetWindowText Justs gets The Texts And Put It In a Var.
So If I Use

Code:

char* edit_text[];
GetWindowText(hwndEdit, edit_text, strlen(edit_text));

Would It Work ??

No it wouldn't
1 you don't provide size for the buffer
2. you edit_text has a wrong type
3. you cannot use strlen on notinitialized string
4. even if you initialize the buffer with the empty string strlen will give you 0 instead of the buffer size

What you can change in the sample is:

Code:

char edit_text[512];
GetWindowText(hwndEdit, edit_text, sizeof(edit_text));

No, for the reasons pointed out by vart. In my example, the size of the array is 512, and GetWindowText will return a maximum of 512 characters, as indicated by the last argument.

If you need to return an unknown number of characters and therefore can not use a fixed size array, you can allocate memory dynamically. This function shows how to do that:

Code:

char* AllocAndGetText(HWND hwndControl)
{
	int count = GetWindowTextLength(hwndControl);
	char* result = malloc(count * sizeof(char));

	if (result != NULL)
	{
		GetWindowText(hwndControl, result, count);
	}

	return result;
}

and the function would be used in the following manner:

Code:

char* edit_text = AllocAndGetText(hwndEdit);

/* Use text in edit_text */

/* Free memory when you're done with it. */
free(edit_text);

However, usually there is a reasonable maximum number of characters you would expect and you can use an array.

This tutorial is very good if you haven't seen it.

But char edit_text[512] Will Limit The Lenth Of The string But I Wanna Let The User Type
Text In The Textbox AS LONG He/She Wants Then How Can I Do It ??

http://catb.org/~esr/faqs/smart-ques...html#writewell

OK Can I Do It Like This ??

Code:

char edit_text[GetWindowTextLength(hwndEdit)];
GetWindowText(hwndEdit, edit_text, GetWindowTextLength(hwndEdit));

not in C

In some compilers. Run-time sized arrays are a feature of C99. The main Windows compiler, MSVC, does not support C99 (it supports the previous version of C, C89). Also, C++ does not support C99 features, although some compilers allow it. So in summary:
- Try it and see.
- Even if it does work, it will make your code incompatible with other compilers.

No It Doesn't Work In MSVC++

Here Is An Another

Code:

..................................................................
	case WM_LBUTTONDOWN:
		m_edit_val = hwndEdit.dwStyle;
		MessageBox(0,"Text On The Edit box Would Be Here","Title",MB_OK);
		break;
........................................................

But If Use case BN_CLICKED:
It Simply Doesn't Work

Because BN_CLICKED is a notification, not a message. It's an event code in a WM_COMMAND sent by a button.

You really just write random code and hope it works, don't you?

Code:

CMyEdit : public CEdit
{
        public:
	CString GetText()
	{
		CString text;
		this->GetWindowText(text);
		return text;
	}
};

CMyEdit *Field = new CMyEdit();
...
AfxMessageBox(Field->GetText());

This ain't MFC ...