I have some code that is greatly minimized to the one below (which won't compile or run, btw). The trouble is that the writefln call shows that wRepeatCount has a value greater than 0 at that point. When it comes to foo, it has been reset to 0. Do anyone have an idea what is happening? Is it a memory allocation issue? Scoping issue? Thread problem (In the real application, bar is part of the run function pointer)? I don't write to ip at no point in my application between getting the value and using it, still they change. I am aware that I'm not very experienced using structs, especially this type, so I find it likely that it is something I do and not a bug elsewhere. The app/library only depend on the Win32 API and Phobos. Suggestions is what I'm after here.

int bar()
{
  HANDLE hConIn;
  INPUT_RECORD ip;
  DWORD read;

  ReadConsoleInputW(hConIn, ip, 1, &read);
  writefln(ip.Event.KeyEvent.wRepeatCount);
  return foo(ip);
}

int foo(INPUT_RECORD ip)
{
  if (ip.EventType == KEY_EVENT) {
    return ip.Event.KeyEvent.wRepeatCount;
  }
  return 0;
}

Lars Ivar Igesund

Lars Ivar Igesund wrote:
> 
> int bar()
> {
>   HANDLE hConIn;
>   INPUT_RECORD ip;
>   DWORD read;
> 
>   ReadConsoleInputW(hConIn, ip, 1, &read);
>   writefln(ip.Event.KeyEvent.wRepeatCount);
>   return foo(ip);
> }
> 
> int foo(INPUT_RECORD ip)
> {
>   if (ip.EventType == KEY_EVENT) {
>     return ip.Event.KeyEvent.wRepeatCount;
>   }
>   return 0;
> }
> 
> Lars Ivar Igesund

Got a clue.

What kind of type is INPUT_RECORD? Is it a struct or a class, how is it build up? Also, should:

writefln(ip.Event.KeyEvent.wRepeatCount);

not be:

writefln("%s", ip.Event.KeyEvent.wRepeatCount);

Since it now just prints rubbish on the console.

Regards,
Sjoerd

Lars Ivar Igesund wrote:

> I have some code that is greatly minimized to the one below (which won't compile or run, btw). The trouble is that the writefln call shows that wRepeatCount has a value greater than 0 at that point. When it comes to foo, it has been reset to 0. Do anyone have an idea what is happening? Is it a memory allocation issue? Scoping issue? Thread problem (In the real application, bar is part of the run function pointer)? I don't write to ip at no point in my application between getting the value and using it, still they change. I am aware that I'm not very experienced using structs, especially this type, so I find it likely that it is something I do and not a bug elsewhere. The app/library only depend on the Win32 API and Phobos. Suggestions is what I'm after here.
> 
> int bar()
> {
>    HANDLE hConIn;
>    INPUT_RECORD ip;
>    DWORD read;
> 
>    ReadConsoleInputW(hConIn, ip, 1, &read);
>    writefln(ip.Event.KeyEvent.wRepeatCount);
>    return foo(ip);
> }
> 
> int foo(INPUT_RECORD ip)
> {
>    if (ip.EventType == KEY_EVENT) {
>      return ip.Event.KeyEvent.wRepeatCount;
>    }
>    return 0;
> }
> 
> Lars Ivar Igesund

try declaring
 int foo(inout INPUT_RECORD ip)
just to see if there is a problem passing structs to functions by value.

Ben Hinkle wrote:

> Lars Ivar Igesund wrote:
> 
> 
>>I have some code that is greatly minimized to the one below (which won't
>>compile or run, btw). The trouble is that the writefln call shows that
>>wRepeatCount has a value greater than 0 at that point. When it comes to
>>foo, it has been reset to 0. Do anyone have an idea what is happening?
>>Is it a memory allocation issue? Scoping issue? Thread problem (In the
>>real application, bar is part of the run function pointer)? I don't
>>write to ip at no point in my application between getting the value and
>>using it, still they change. I am aware that I'm not very experienced
>>using structs, especially this type, so I find it likely that it is
>>something I do and not a bug elsewhere. The app/library only depend on
>>the Win32 API and Phobos. Suggestions is what I'm after here.
>>
>>int bar()
>>{
>>   HANDLE hConIn;
>>   INPUT_RECORD ip;
>>   DWORD read;
>>
>>   ReadConsoleInputW(hConIn, ip, 1, &read);
>>   writefln(ip.Event.KeyEvent.wRepeatCount);
>>   return foo(ip);
>>}
>>
>>int foo(INPUT_RECORD ip)
>>{
>>   if (ip.EventType == KEY_EVENT) {
>>     return ip.Event.KeyEvent.wRepeatCount;
>>   }
>>   return 0;
>>}
>>
>>Lars Ivar Igesund
> 
> 
> try declaring
>  int foo(inout INPUT_RECORD ip)
> just to see if there is a problem passing structs to functions by value.

That worked! I was thinking about trying that, but didn't as the original C code passed it by value.

Lars Ivar Igesund