Title: Another way to store a DWORD into the Registry database
Question: An example of how to use RegQueryValueEx to write a DWORD into the Registry database.
Answer:
use Registry;
...
function ReadDWORD(vKey, vName: String): DWORD;
var
iType: DWORD;
iSize: DWORD;
iResult: Array [0..3] of Byte;
hkResult: HKEY;
begin
Result:=0;
iType:=REG_DWORD;
iSize:=4;
if RegOpenKeyEx(HKEY_LOCAL_MACHINE,LPTSTR(vKey), 0, KEY_READ, hkResult)ERROR_SUCCESS then
Exit;
if RegQueryValueEx(hkResult,LPTSTR(vName),Nil,@iType,@iResult,@iSize)=ERROR_SUCCESS then
begin
Result:=iResult[0]+(iResult[1] SHL 8)+(iResult[2] SHL 16)+(iResult[3] SHL 24);
end;
end;
function WriteDWORD(vKey, vName: String; iValue: DWORD): Boolean;
var
iType: DWORD;
iSize: DWORD;
hkResult: HKEY;
ibValue: Array [0..3] of Byte;
begin
Result:=False;
if RegOpenKeyEx(HKEY_LOCAL_MACHINE,LPTSTR(vKey), 0, KEY_WRITE, hkResult)ERROR_SUCCESS then
Exit;
iType:=REG_DWORD;
iSize:=4;
ibValue[0]:=(iValue AND $000000FF);
ibValue[1]:=(iValue AND $0000FF00) SHR 8;
ibValue[2]:=(iValue AND $00FF0000) SHR 16;
ibValue[3]:=(iValue AND $FF000000) SHR 24;
if RegSetValueEx(hkResult,LPTSTR(vName),0,iType,@ibValue[0],iSize)=ERROR_SUCCESS then
Result:=True;
end;