Editbox

[FantastichenEin]

I have created a window with an EditBox on it.
I want to create a function that appends the EditBox text with a line of text.
I currently have the following.

void OutputDebug(char *text)
{
  SendMessage(hwndEdit, WM_SETTEXT, 0, 
             (LPARAM) text); 
} 

The above code overwrites what is already in the EditBox.
How do I append it?
Thanks

[CornedBee]

void OutputDebug(char *text)
{
  char bigbuffer[1000];
  SendMessage(hwndEdit, WM_GETTEXT, 1000, 
             (LPARAM) bigbuffer); 
  strcat(bigbuffer, text);
  SendMessage(hwndEdit, WM_SETTEXT, 0, 
             (LPARAM) bigbuffer); 
} 

I think...

[jim mcnamara]

Call SendMessage with WM_GETTEXT first to return the box's text. Concatenate the two strings, then call WM_SETTEXT to set the new string back into the box.

[jim mcnamara]

Woops! CB got there first!

IF you're writing some kind of logger or debug window, be aware that textboxes have a limit on text string length - 32767 chars including the null-terminator.

[FantastichenEin]

Thanks - I did think of using a buffer but I thought there might be a more efficient way.

[FantastichenEin]

Originally posted by jim mcnamara
IF you're writing some kind of logger or debug window, be aware that textboxes have a limit on text string length - 32767 chars including the null-terminator.

Thanks for this info

[CornedBee]

I don't think so. You can save space and sacrifice speed by using WM_GETTEXTLENGTH and strlen(text) to calculate the needed size of bigbuffer and dynamically allocate it.

[jim mcnamara]

No. Missed communication.

I thought I was warning him about trying to put too long a string in the editbox, not how to allocate string memory. Issuing this warning was a result of concluding from the fact that his function was named OutputDebug, therefore, he would be streaming output to the box. I could be wrong.

And it really matters little.

[CornedBee]

Thanks - I did think of using a buffer but I thought there might be a more efficient way.

I hit reply just after this post...