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NothingToShow
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 Posted: Tue Jun 24, 2008 9:47 am Post subject: [Delphi - Help needed] Check if 2 strings are equal |
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Hey, got a bit of a problem here.
I'm using an "if and" structure, and got some problems in that.
My var section:
| Code: | var
...
string1, string2: string; |
They're assignment:
| Code: | string1 := '';
string2 := 'test'; //Some random text |
My "if and" structure:
| Code: | if CONDITION1 and string1 <> string2 then
begin
...
end; |
My errors (On same line, after "and"):
| Code: | Incompatible types: 'String' and 'Integer'
Incompatible types: 'String' and 'Boolean' |
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DeletedUser14087
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| Posted: Tue Jun 24, 2008 10:16 am Post subject: |
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"if" "and" are statements, and do it like:
| Code: | | if string1 = string2 then |
P.S - <> means !=, like if not hwnd = 0 then will be the same as if hwnd <> 0 ok ?
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NothingToShow
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| Posted: Tue Jun 24, 2008 10:34 am Post subject: |
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| Rot1 wrote: | "if" "and" are statements, and do it like:
| Code: | | if string1 = string2 then |
P.S - <> means !=, like if not hwnd = 0 then will be the same as if hwnd <> 0 ok ?
leave feedback |
Sorry about the statement/structure part. 
I've tried this:
| Code: | | if length(string1) > 2 then if String1 = String2 then |
Doesn't work either.
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tombana
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| Posted: Tue Jun 24, 2008 10:59 am Post subject: |
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| I don't know about Delphi, but in C++ you can't compare strings like that. You have to use a functions like lstrcmp.
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WafflesFTW
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| Posted: Tue Jun 24, 2008 12:08 pm Post subject: |
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| Oh, your problem is simple. You are attempting to compare two variables of different types. You are comparing a string to an integer. That simply does not work. You have to make both the same type. In other words, use the "StrToInt" function on the string to convert it to an integer before comparing it with the 2. Your second error occurs, because you are testing a boolean variable(True vs. false) on a string as well. Convert the string to a boolean value, similarily, and you should not have problems.
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Jani
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| Posted: Tue Jun 24, 2008 12:25 pm Post subject: |
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| tombana wrote: | | I don't know about Delphi, but in C++ you can't compare strings like that. You have to use a functions like lstrcmp. |
Actually you can. Altho, you need to use == operator, not =. | Code: | #include <string>
std::string s1("asd");
std::string s2("as");
if( s1 == s2 ) { /* This won't be executed */; }
s2.append("d");
if( s1 == s2 ) { /* This will be executed */; } |
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HolyBlah
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| Posted: Tue Jun 24, 2008 12:47 pm Post subject: |
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Writing "if CONDITION1 and string1 <> string2 then" is like doing logical and between CONDITION1 and string1 and then check if the result equal to string2.
You should write it like "if CONDITION1 and (string1 <> string2) then".
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DeletedUser14087
I post too much
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| Posted: Tue Jun 24, 2008 1:17 pm Post subject: |
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| Moller wrote: | | Rot1 wrote: | "if" "and" are statements, and do it like:
| Code: | | if string1 = string2 then |
P.S - <> means !=, like if not hwnd = 0 then will be the same as if hwnd <> 0 ok ?
leave feedback |
Sorry about the statement/structure part.
I've tried this:
| Code: | | if length(string1) > 2 then if String1 = String2 then |
Doesn't work either. |
You're now checking of the length of the strings are equal, try:
if not string1<>string2 then result:=true; //return value is true if the strings are the same
oh yeah, it's like this:
| Code: | | if IntToStr(String1) = IntToStr(String2) then |
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rapion124
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| Posted: Tue Jun 24, 2008 2:10 pm Post subject: |
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Add parenthesis... This is how it should be:
| Code: |
if ((BOOLEAN condition) and (str1 = str2)) then
...
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NothingToShow
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| Posted: Tue Jun 24, 2008 2:53 pm Post subject: |
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Okay, I've gotten this far.
| Code: | | if ((length(temp) > 2) and (IntToStr(temp) = IntToStr(lastUser)) then |
Now the error is:
| Code: | | There is no overloaded version of 'IntToStr' that can be called with these arguments |
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WafflesFTW
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| Posted: Tue Jun 24, 2008 3:26 pm Post subject: |
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| StrToInt, not IntToStr
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Dark Byte
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| Posted: Tue Jun 24, 2008 4:30 pm Post subject: |
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| Code: |
if (length(temp) > 2) and (temp = lastUser) then
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ups2000ups
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| Posted: Tue Jun 24, 2008 8:38 pm Post subject: |
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well i dont know why all started to say inttostr (since it was never an integer)
just look what DarkByte sade
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dont complain about my english...
1*1 = 2? |
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NothingToShow
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| Posted: Wed Jun 25, 2008 1:04 am Post subject: |
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I'm sure Dark Bytes method works, but it's not what I'm in need of.
I need to make sure that temp is not equal lastUser.
I'm very sorry if I've said it the other way around.
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HolyBlah
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| Posted: Wed Jun 25, 2008 1:06 am Post subject: |
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| Code: | | if (length(temp) > 2) and (temp <> lastUser) then |
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