Hi everyone I have a request about delphi programming, dont tell me its obsolete because I know, this is a school project?

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my code looks like this.

Delphi

procedure TForm1.BtnSearchClick(Sender: TObject); 
var 
sStudent :String; 
begin 
sStudent:=EdtSearch.Text; 
RDisp.Lines.LoadFromFile('Students\ ' +sStudent+ '.txt'); 
if sStudent<>' ' 
then 
begin 
Application.MessageBox('No data has been inputed. Please Input a name to search','Error no information to search',0); 
end; 
end;

basically what I need is the sStudent(which is a Tedit) to search for a student name, If the Tedit is empty it should show an error ("No data has been inputed. Please Input a name to search") etcetera, what I get is the messagebox even though the rich edit has pulled up the information

What I have tried:

I have tried everything, but even though we had extensive classes on this I still cant find it... chances are its right under my nose and I too blind to see it.

Posted 4-Aug-16 9:43am

Crytach Daiguren

Updated 4-Aug-16 10:56am

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Richard Deeming · Accepted Answer · 2016-08-04T10:56:00

I haven't touched Delphi in years, but I'd assume that if sStudent <> ' ' will execute everything inside the if block unless the textbox contains a single space. So if you leave it empty, or type in anything other than a single space, the message will be shown.

You probably also want to move the LoadFromFile line into an else block, and you might need to remove the leading space from the file name, depending on how you've named the files.

Delphi

sStudent := EdtSearch.Text; 

if sStudent = '' 
then 
begin 
    Application.MessageBox('No data has been inputed. Please Input a name to search', 'Error no information to search', 0); 
end
else
begin
    RDisp.Lines.LoadFromFile('Students\' + sStudent + '.txt'); 
end;