Hello I have a delphi question that has been eating at me and I need help

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"This is a delphi project that I need help with as in History of programming project" ok so it goes like this, I have my code fleshed out on the search system where basically if you search a blank Tedit it will give you an error, now I have hit a road block as I want it to produce a new error if the item searched doesnt exist... this is the code that is eating at me.

Delphi

procedure TForm1.BtnSearchClick(Sender: TObject);
var
sStudent :String;
begin
    sStudent:=CbSearch.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 + '.zip');
end;
end;

I know that below the "Rdisp.Lines" I need to provide another conditional if statement but I dont know how to go about it... Please help

What I have tried:

I have tried adding an if statement but I got rid of that as soon as it crashed my program... I know I need an "if sStudent='' "etc, but I dont have a clue what to do it on...

Posted 9-Aug-16 6:24am

Crytach Daiguren

Updated 9-Aug-16 8:09am

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[no name] 9-Aug-16 12:44pm

Hard to figure out what the problem is, at least for me.
Do you like to check whether the files exists?
Is the problem LoadFromFile? What type is RDisp, that you can load a zip file to it?

Crytach Daiguren 9-Aug-16 12:53pm

Ahhh yes... RDisp is a Richedit, basically what I want is, if you search "Mario" in the Tedit it will display an error message that says "Student doesnt exist", the way I have it is studnent data is stored in a protected zip file, and thats working perfectly, I just want the condition that if the Search word doesnt exist then I get an error.

[no name] 9-Aug-16 13:17pm

I assume you like to search it i the RichEdit. If yes, have a look here in the acepted answer:
filter - Counting specific text in memo (Delphi) - Stack Overflow[^]. The example is for Memo but what I remember is, that RichText has also a property Lines.

Crytach Daiguren 9-Aug-16 13:48pm

Nope lets see if I can put this properly... when a students data is saved it is saved to a "Students_name.zip" when I search that name "Students_Name" it brings up the data in a richedit (THAT IS ALL DONE ALREADY SO I DONT NEED HELP FOR THAT)... now what I want to do is condition that is "If student name does not exist then display error message 'student doesnt exist'" similar to the one you see above.

[no name] 9-Aug-16 14:04pm

What does "If student name does not exist" exactly means? The file does not exists?
¿Qué significa "If student name does not exist" exactamente? No existe el archivo "....\Students_Name.zip"?

Crytach Daiguren 9-Aug-16 14:09pm

All the student information is stored in a folder under the format of "StudentName StudentSurname.zip" for example "Max Johnson.zip" now hypthetically speaking Max Johnson is the only student on record THEREFORE if I search for example "Alice Bogard" it MUST say as an error message "Student does not exist" I want the code for the Error message box to be able to do so, because as of now when I do a search of a non existent student the program crashes, when I just need a simple "Student doesnt exist"

[no name] 9-Aug-16 14:11pm

See solution of Richard Deeming, I also think now, you are looking for FileExists.

Crytach Daiguren 9-Aug-16 14:19pm

Thanks Richard Deeming!!! Works beautifully

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Richard Deeming · Accepted Answer · 2016-08-09T08:09:00

It sounds like you're looking for the FileExists function[^]: