Matt Emson wrote: ...
It should be boolean. All Win32API return values which are BOOL translate as Boolean.
That's not true. WinAPI uses BOOL type, it's defined in WinAPI headers as typedef int WINBOOL,*PWINBOOL,*LPWINBOOL; ... typedef WINBOOL BOOL;
So BOOL is int. So it's 32-bit value on 32-bit systems. Compile this simplistic program with any compiler under windows to see that BOOL really takes 4 bytes.
#include <windows.h>
int main(int argc, char *argv[])
{
printf("%d\n", sizeof(BOOL));
return 0;
}
/* output is 4 */Then, another simplistic program in FPC confirms that LongBool takes 4 bytes of space and Boolean 1 byte:
begin
Writeln(SizeOf(LongBool), ' ', SizeOf(Boolean));
end.
{ output is 4 1 }In FPC Windows unit BOOL type is correctly defined as WINBOOL = longbool; BOOL = WINBOOL;
Summing it up: you have to use LongBool (or Windows.Bool) when translating WinAPI functions that take or return BOOL type. Boolean is not correct, even if it sometimes works.
-- Michalis
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