Multiline Edit Box Parser

Trying my hand at extracting user entered data from a multiline edit box... my strategy is to first, get the number of total lines from the edit box.. and the length of each line from the edit box.. and create a dynamic 2D array that is NULL terminated at the second dimension.. then read in the edit box line at a time..

Came up with a little TextOut( ) loop just as a method to visually verify if my 2d array was loaded correctly.. and made a WM_COMMAND case to respond to the, "Add Count" pushbutton and call the EditBoxFileParser( ) function... which should load and display the contents of the Lines[][] 2d array.

Please take a look when ye' get a chance.. at runtime, the user should be able to enter stuff in the edit box.. then click the, "Add Count" pushbutton.. and a display of the edit box conents should appear somewhere off to the right side of the screen..

At this point, nothing happens when I enter stuff in the edit box and click the "add count" button..


Here is my editbox file parser function:

Code:

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void EditBoxFileParser(HWND hwnd, HWND hEdit)
{
   
    int iCount, iLength;
    TCHAR **Lines;
   
    //Get Number of Lines in Edit Field
    iCount = SendMessage(hEdit, EM_GETLINECOUNT, 0, 0);
   
    Lines = new TCHAR*[iCount];
   
    //Populate 2D array - Lines[LineIndex][LineText]
    for(int i=0; i<iCount; i++)
    {   
          iLength = SendMessage(hEdit, EM_LINELENGTH, i, 0);
          Lines[i] = new TCHAR[iLength+1];
          SendMessage(hEdit, EM_GETLINE, i, (LPARAM)Lines[i]);
          Lines[i][iLength+1] = '\0';
    }
   

    //Visually verify the Lines[][] 2D array
    HDC hdc;
    PAINTSTRUCT ps;         
    HFONT hFont;
   
    hdc = BeginPaint(hwnd, &ps);
    hFont = (HFONT)GetStockObject(SYSTEM_FONT);
    SelectObject(hdc, hFont);
   
    for(int i=0, x=200, y=200; i<iCount; i++)
         
            TextOut(hdc, x, y+=10, Lines[i], lstrlen(Lines[i]));
           
    DeleteObject(hFont);
    EndPaint(hwnd, &ps);
   
}

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And here is the complete code thus far if needed.

Looking at the EM_LINELENGTH message, it looks like you might need to use EM_LINEINDEX to get the right value to use as the wparam argument.

It's kind of confusing though, because msdn says:

Quote:

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For multiline edit controls, the return value is the length, in TCHARs, of the line specified by the wParam parameter.

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But earlier it says the wParam parameter "Specifies the character index of a character in the line whose length is to be retrieved" :confused:

Here is the solution to my problem..

thanks anonytmouse :cool:

Have this function to read in user input from my edit box.. but it sometimes only reads in like 80-90% of a line.. what am I doing wrong..??!?

Code:

---

void EditBoxFileParser(HWND hwnd, HWND hEdit)
{
   
    int iCount;
    WORD iLength;         
    TCHAR **Lines;
   
    //Get Number of Lines in Edit Field
    iCount = SendMessage(hEdit, EM_GETLINECOUNT, 0, 0);
   
    //If Editbox is empty, exit function
    if(!iCount)
   
          return;
   
    Lines = new TCHAR*[iCount];
   
    //Populate 2D array, Lines[LineIndex][LineText]
    for(int i=0; i<iCount; i++)
    {   
          iLength = (WORD)SendMessage(hEdit, EM_LINELENGTH, i, 0);
          Lines[i] = new TCHAR[iLength+sizeof(WORD)+1];
          CopyMemory(Lines[i], &iLength, sizeof(WORD));
          SendMessage(hEdit, EM_GETLINE, i, (LPARAM)Lines[i]);
          Lines[i][iLength] = '\0';
    } 
   
    //Visually Verify Contents of the Lines[][] array
    HDC hdc;
    HFONT hFont;
    PAINTSTRUCT ps;
    RECT rect;
   
    rect.left = 250;
    rect.top  = 250;
    rect.right  = 600;
    rect.bottom = 500; 
   
    InvalidateRect(hwnd, &rect, TRUE);
   
    hdc = BeginPaint(hwnd, &ps);       
    hFont = (HFONT)GetStockObject(SYSTEM_FONT); 
         
    SelectObject(hdc, hFont);   
   
    for(int i=0, x=300, y=275; i<iCount; i++)
         
            TextOut(hdc, x, y+=20, Lines[i], lstrlen(Lines[i]));
           
    DeleteObject(hFont);
    EndPaint(hwnd, &ps);             
}

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As mentioned by Jawib, you are not using EM_LINELENGTH correctly. The wParam argument specifies a character index rather than a line number. You can retrieve a character index for a given line with the EM_LINEINDEX message.

Quote:

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Originally Posted by MSDN EM_LINELENGTH

wParam: Specifies the character index of a character in the line whose length is to be retrieved.

Use the EM_LINEINDEX message to retrieve a character index for a given line number within a multiline edit control.

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you guys are awesome...

my problem was, "well.. i tried using both EM_LINELENGTH.. then switched it with EM_LINEINDEX.. no dice.." so i figured i must be missing something.. read over msdn like 10 times.. busted out charles petzold page #400.. thought about it awhile.. then it hit me like my ex g/f.. I have to use both together... :cool:

Code:

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void EditBoxFileParser(HWND hwnd, HWND hEdit)
{
   
    int iCount;
    WORD iLength, iOffset;       
    TCHAR **Lines;
   
    //Get Number of Lines in Edit Field
    iCount = SendMessage(hEdit, EM_GETLINECOUNT, 0, 0);
   
    //If Editbox is empty, exit function
    if(!iCount)
   
          return;
   
    Lines = new TCHAR*[iCount];
   
    //Populate 2D array, Lines[LineIndex][LineText]
    for(int i=0; i<iCount; i++)
    {    iOffset = SendMessage(hEdit, EM_LINEINDEX, i, 0);
          iLength = (WORD)SendMessage(hEdit, EM_LINELENGTH, iOffset, 0);
          Lines[i] = new TCHAR[iLength+sizeof(WORD)+1];
          CopyMemory(Lines[i], &iLength, sizeof(WORD));         
          SendMessage(hEdit, EM_GETLINE, i, (LPARAM)Lines[i]);
          Lines[i][iLength] = '\0';
    }

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Good to see my advice wasn't completely off-base (even though it didn't help your original problem :p )