append (not strcat) to combine strings with whitespace (\n)
49 次查看(过去 30 天)
显示 更早的评论
I have a text box (text edit field, shoud it be a label box?)
I want to add lines of text to it without loosing the old text.
app.DebugField.Value = append(app.DebugField.Value, "rew LB\n");
but the newlines are showing up as text \n
Start Trials at 22:26:09 >> rew LB\n
I guess I have to sprintf() the string first but why can't \n be properly interpreted by string handling functions?
3 个评论
Stephen23
2024-8-1,4:10
编辑:Stephen23
2024-8-1,5:10
"I guess I have to sprintf() the string first but why can't \n be properly interpreted by string handling functions?"
Only the functions which are documented to interpret such special characters (e.g. SPRINTF, FPRINTF, COMPOSE, etc.) will interpret such escaped sequences. Text operations such as concatenation do not interpret anything.
"... even sprintf() to magically turn \n into hex13 hex 10 isn't working!"
Note that carriage return is actually decimal 13 (hex: D) and line feed is decimal 10 (hex: A).
If you want a carriage return followed by a line feed then you can specify this:
txt = sprintf('%s\r\n','hello','world')
double(txt) % check that char(13) and char(10) have been created
Voss advised that an EDIT FIELD is for a single line of text. Use a TEXT AREA if you want to display multiple lines:
采纳的回答
SACHIN KHANDELWAL
2024-8-1,4:10
I had a quick look into the code and found that the "append" function only takes strings as input and concatenates them. It will not evaluate expressions like "\n".
Therefore, I would recommend trying a different workflow. Here is one that I think might be helpful to you. Please refer to the following MATLAB code:
newText = 'rew LB';
app.TextArea.Value = [app.TextArea.Value; newText]; % This way you can append text in the new line
Hope it helps!
更多回答(2 个)
Voss
2024-8-1,4:35
From here:
"If you want to allow multiple lines of text, use a text area component instead of an edit field."
0 个评论
Walter Roberson
2024-8-6,20:59
app.DebugField.Value = append(app.DebugField.Value, "rew LB" + newline);
0 个评论
另请参阅
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!