How can I pause until the "return" key is pressed?

I have a gui that I need to have wait until the return key is pressed before advancing. Below is my code but I keep getting an error saying:

Error using == Matrix dimensions must agree.

Error in RunDlg_bab>ok_Callback (line 388) if currkey=='return'

Below is my code:

    currkey=0;
    % do not move on until enter key is pressed
    while currkey~=1
        pause; % wait for a keypress
        currkey=get(gcf,'CurrentKey'); 
        if currkey=='return'
            currkey==1
        else
            currkey==0
        end
    end

Any sort of help would be really appreciated!

[skynet2]

This looks fine, except you accidentally are checking for equality when you want to set currKey to 1 or 0. Revision follows:

currkey=0;
% do not move on until enter key is pressed
while currkey~=1
    pause; % wait for a keypress
    currkey=get(gcf,'CurrentKey'); 
    if strcmp(currkey, 'return') % You also want to use strcmp here.
        currkey=1 % Error was here; the "==" should be "="
    else
        currkey=0 % Error was here; the "==" should be "="
    end
end

[Walter Roberson]

Using strcmp() is critical for this situation.

Answer 1

[Chad Greene]

You may be able to use waitforbuttonpress.

[Shae Morgan]

Yeah it doesn't work so well, because while paused, the user is typing input into a text edit box. So I'm trying to allow the text edit to have answers typed into it, but the whole gui doesn't move on until specifically the return key (enter) is pressed. Any other ideas?

[Walter Roberson]

The Callback function of a uicontrol style 'text' does not get activated until return is pressed or the user selects a different control.

[Chad Greene]

I'm not sure what the difference is between 'CurrentKey' and 'CurrentCharacter', but when I've done this I've used the following syntax:

while true
    w = waitforbuttonpress; 
    switch w 
        case 1 % (keyboard press) 
          key = get(gcf,'currentcharacter'); 

              switch key
                  case 116 % 116 is lowercase t
                      disp('Have some tea.') 
                  case 27 % 27 is the escape key
                      disp('User pressed the escape key. I''m quitting.')
                      break % break out of the while loop
                  case 13 % 13 is the return key 
                      disp('User pressed the return key. Quitting the loop.')
                      break
                  otherwise 
                      % Wait for a different command. 
              end
      end
  end

[Shae Morgan]

The return key is working fine, the problem is that the program is also registering "shift" as "return". while the program is waiting, if the user is typing into the edit-text box and uses a capital letter (by pressing shift) the program moves on to the next command instead of waiting exclusively for "return".

still stuck.

[Walter Roberson]

If the purpose is to wait until return is pressed, then do not use waitforbuttonpress at all. Instead, once it is determined that the mode should be in place, waitfor() or uiwait() a condition that is made true by your Callback on the uicontrol, as that Callback will not be activated until Return is pressed. There would be no need to monitor every key.

CurrentKey is the name of the key that was pressed, which might include 'shift' . If an upper-case character was chosen then the name of the key is the lower case version of it

CurrentCharacter is [] (empty) is there no value associated with the key that was typed, such as is the case for shift. Otherwise it is the char() of what was typed, so for control-f it would be char(6) and for shift-f it would be char(70) which is 'F'