hi

I'm using those imports:

import core.runtime;
import core.sys.windows.windows;

when I call GetWindowTextW DMD compiler complains! (error:undefined identifier)

any solution?

I'm new to Dlang and I have no Idea whats wrong with this code!

wchar[260] buffer;
HWND hWindow = GetForegroundWindow();
GetWindowTextW(hWindow, buffer, sizeof(title)); <-- Problem here

> GetWindowTextW(hWindow, buffer, sizeof(title)); <-- Problem here

please Ignore the sizeof(title) parameter, I copied that from c++ equivalent code :D

On Wednesday, 17 June 2015 at 20:40:02 UTC, Dan wrote:
> I'm new to Dlang and I have no Idea whats wrong with this code!
>
> wchar[260] buffer;
> HWND hWindow = GetForegroundWindow();
> GetWindowTextW(hWindow, buffer, sizeof(title)); <-- Problem here

The compiler is complaining it can't find an identifier named GetWindowTextW, so you'll have to declare it yourself.

Try this:

  extern(Windows)
  int GetWindowTextW(HWND hWnd, LPWSTR lpString, int nMaxCount);

And call it like so:

  wchar[MAX_PATH] buffer;
  int length = GetWindowTextW(GetForegroundWindow(), buffer.ptr, buffer.length);

thank you John it worked :)

do I always need do the same for all windows API?

On Wednesday, 17 June 2015 at 20:50:27 UTC, John Chapman wrote:
>   wchar[MAX_PATH] buffer;
>   int length = GetWindowTextW(GetForegroundWindow(), buffer.ptr, buffer.length);

Don't know why I used MAX_PATH there. You should probably dynamically allocate a buffer based on GetWindowTextLengthW.

  extern(Windows)
  int GetWindowTextLengthW(HWND hWnd);

Putting it all together:

  import core.stdc.stdlib : malloc, free;
  import std.utf;

  HWND hwnd = GetForegroundWindow();
  int length = GetWindowTextLengthW(hwnd);
  if (length > 0) {
    auto buffer = cast(wchar*)malloc((length + 1) * wchar.sizeof);
    scope(exit) free(buffer);

    length = GetWindowTextW(hwnd, buffer, length);
    if (length > 0)
      auto title = buffer[0 .. length].toUTF8();
  }

On Wednesday, 17 June 2015 at 21:00:55 UTC, Dan wrote:
> thank you John it worked :)
>
> do I always need do the same for all windows API?

For most Win32 API functions, yes. Although there are some more complete headers on Github (for example, https://github.com/rikkimax/WindowsAPI).

thank you so much John :)