Mega Code Archive
Retrieve DSN names and ODBC Drivers list
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Title: Retrieve DSN names and ODBC Drivers list
Question: How to get a list of DSNs in system?
Answer:
I didn't try it in all delphi versions but must work... ;)
unit DSNFuncs;
interface
Uses Windows, Classes, SysUtils, Registry;
Type
TDSN_Type = (dtUSER, dtSYSTEM);
TDSN_Types = Set of TDSN_Type;
function GetODBCDriversList: TStrings;
function GetDSNList (aDSN_TYPES: TDSN_Types; aDriverFilter: String): TStrings;
implementation
function GetODBCDriversList: TStrings;
// This function returns a list of currently installed ODBC drivers
// Example: combobox1.Assign(GetODBCDriversList); // ;)
var
aStringlist : TStringlist;
aRegistry : TRegistry;
Begin
aStringlist:= Tstringlist.Create;
aRegistry:= TRegistry.Create;
Result:= Tstringlist.Create;
with aRegistry do
Begin
rootkey:= HKEY_LOCAL_MACHINE;
OpenKey('Software\ODBC\ODBCINST.INI\ODBC Drivers',False);
GetValueNames(aStringlist);
End;
aRegistry.Free;
aStringlist.Sort;
result.AddStrings(aStringlist);
aStringlist.Free;
End;
function GetDSNList (aDSN_TYPES: TDSN_Types; aDriverFilter: String): TStrings;
// This function returns a list of dsn( user's dsn (dtUser),
// system's dsn (dtSystem), or both), where driver contains aDriverFilter,
// it can be complete driver name or part of it;
// (Example: 'Microsoft Access Driver (*.mdb)' or 'Access').
//
// Example: listbox1.Items.Assign(GetDSNList([dtUser,dtSystem],'Access');
// It will return a list with all existing DSN both from User and System with
// string 'Access' in driver's name.
var
aStringList : TStringlist;
aStrings1 : TStrings;
aStrings2 : Tstrings;
aString : String;
aRegistry : TRegistry;
aInt : Integer;
Begin
aStringlist:=TStringlist.Create;
aStrings1:=TStringlist.Create;
aStrings2:=TStringlist.Create;
If dtUSER in aDSN_TYPES then
Begin
aRegistry:= Tregistry.Create;
With aRegistry do
Begin
RootKey:=HKEY_CURRENT_USER;
OpenKey('Software\ODBC\ODBC.INI\ODBC Data Sources',False);
GetValueNames(aStrings1);
for aInt:=aStrings1.Count-1 downto 0 do
Begin
aString:= ReadString(aStrings1.Strings[aInt]);
if ((Pos( aDriverFilter, aString ) = 0) and (aDriverFilter'')) then
aStrings1.Delete(aInt);
End;
End;
aRegistry.Free;
end;
If dtSYSTEM in aDSN_TYPES then
Begin
aRegistry:= Tregistry.Create;
With aRegistry do
Begin
RootKey:=HKEY_LOCAL_MACHINE;
OpenKey('Software\ODBC\ODBC.INI\ODBC Data Sources',False);
GetValueNames(aStrings2);
for aInt:=aStrings2.Count-1 downto 0 do
Begin
aString:= ReadString(aStrings2.Strings[aInt]);
if ((Pos( aDriverFilter, aString) = 0) and (aDriverFilter'')) then
aStrings2.Delete(aInt);
End;
End;
aRegistry.Free;
end;
aStringlist.AddStrings(aStrings1);
aStrings1.Free;
aStringlist.AddStrings(aStrings2);
aStrings2.Free;
aStringlist.Sort;
result:= Tstringlist.Create;
result.Assign(aStringlist);
End;
end.
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