This is a simple question but I don't know how to construct a variable name by concatenating two strings. The code below is how not to do it...
var
UserName1 : String;
UserName2 : String;
Password1 : String;
Password2 : String;
UserCount : Integer;
UserCount := 2;
for Wk1 := 1 to UserCount do
begin
DoLogin(UserName+Wk1, Password+Wk1);
end;
Basically, you can't do this. Variable names are fixed at compile time and translate to addresses which hold the value of the variables.
It looks like you want an array, or in this case, two: one array will hold the login names and one array the password. Of course, you could combine the two into a record and then have an array of records.
type
LogType = record
username, password: string[31]
end;
var
LogArray: array [1..10] of logtype;
usercount, wk1: integer;
begin
UserCount := 2;
for Wk1 := 1 to UserCount do
begin
DoLogin(logarray[wk1].username, logarray[wk1].password);
etc
end;
end;
ShortString for the string types? The OP didn't indicate any need for that, and it's not commonly used any longer in Delphi (certainly not by default in Dephi 5, which is in one of the tags).
string type. Consider the sample code in your answer. How often can you come across a password that long (31 chars)?Don't try and do that.
Reflection (or RTTI - Run Time Type Information) would be needed and it's not good to use in Delphi as it can change from release to release and you would need to include debug info when building I think.
So use an array or two.
var
UserNames[1..2] : String;
Passwords[1..2] : String;
UserCount : Integer;
UserCount := 2;
for Wk1 := 1 to UserCount do
begin
DoLogin(UserNames[Wk1], Passwords[Wk1]);
end;
