digitalmars.D.learn - SendMessageTimeoutW requires casting string to uint?

BoQsc (16/57) Jul 09 2019 I'm quite new to the programming, and I'm getting unsure how to

Dejan Lekic (6/19) Jul 09 2019 std.utf module has all encoding/decoding you need (in this case

Dejan Lekic (2/7) Jul 09 2019 Maybe even the straightforward to!wchar will work!?

Dejan Lekic (3/6) Jul 09 2019 Now that I browsed the std.utf more, I realised what fits your

BoQsc (32/45) Jul 09 2019 So far, this is what I have:

a11e99z (5/26) Jul 09 2019 // add cast to LPARAM for SendMessageTimeoutW

BoQsc (69/96) Jul 09 2019 You are absolutely right.

BoQsc (9/9) Mar 05 2022 Update: 2022-03-04

BoQsc <vaidas.boqsc gmail.com> writes:

I'm quite new to the programming, and I'm getting unsure how to 
make SendMessageTimeoutW to work with D lang.

Most of my attention right now resides around the Argument of the 
SendMessageTimeoutW function:
 "Environment",

It seems that SendMessageTimeoutW  accepts only uint type, and 
string can't be directly used.

I think that I have to convert string characters to "C-style 0 
terminated string".
And everything should work? But I'm unsure how to do that.


All I know that there was toString16z function from tango 
project, that made it all work.
http://www.dsource.org/projects/tango/docs/stable/tango.stdc.stringz.html#toString32z
 cast(LPARAM)(settingName.toString16z())


Here is how the method was before my modifications:
 void broadcastSettingChange (string settingName, uint timeout=1)
 {
     auto result = SendMessageTimeoutW(
         HWND_BROADCAST,
         WM_SETTINGCHANGE,
         0,
         cast(LPARAM)(settingName.toString16z(),
         SMTO_ABORTIFHUNG,
         timeout,
         null
     );





And finally, here is myVersion.d that throws an error (that I use 
incorrect variable type for the argument)

myVersion.d
 import core.sys.windows.windows : SendMessageTimeoutW;
 import core.sys.windows.windows : GetLastError;
 import core.sys.windows.windows : ERROR_SUCCESS;
 import core.sys.windows.windows : SMTO_ABORTIFHUNG;
 import core.sys.windows.windows : LPARAM;
 import core.sys.windows.windows : HWND_BROADCAST;
 import core.sys.windows.windows : WM_SETTINGCHANGE;


 void main(){
 	broadcastSettingChange();
 
 }

 void broadcastSettingChange (uint timeout=1)
 {
     auto result = SendMessageTimeoutW(
         HWND_BROADCAST,
         WM_SETTINGCHANGE,
         0,
         "Environment",
         SMTO_ABORTIFHUNG,
         timeout,
         null
     );
 
     if(result == 0)
     {
         auto errCode = GetLastError();
     }
  }

Jul 09 2019

Dejan Lekic <dejan.lekic gmail.com> writes:

On Tuesday, 9 July 2019 at 10:34:54 UTC, BoQsc wrote:
 I'm quite new to the programming, and I'm getting unsure how to 
 make SendMessageTimeoutW to work with D lang.

 Most of my attention right now resides around the Argument of 
 the SendMessageTimeoutW function:
 "Environment",

 It seems that SendMessageTimeoutW  accepts only uint type, and 
 string can't be directly used.

 I think that I have to convert string characters to "C-style 0 
 terminated string".
 And everything should work? But I'm unsure how to do that.


 All I know that there was toString16z function from tango 
 project, that made it all work.
 

std.utf module has all encoding/decoding you need (in this case 
UTF-16). I guess You need to convert your string using toUTF16 ( 
https://dlang.org/phobos/std_utf.html#toUTF16 ). I do not do 
Windows programming so I am not 100% sure whether this will work 
or not. Give it a try.

Jul 09 2019

Dejan Lekic <dejan.lekic gmail.com> writes:

On Tuesday, 9 July 2019 at 11:06:54 UTC, Dejan Lekic wrote:
 std.utf module has all encoding/decoding you need (in this case 
 UTF-16). I guess You need to convert your string using toUTF16 
 ( https://dlang.org/phobos/std_utf.html#toUTF16 ). I do not do 
 Windows programming so I am not 100% sure whether this will 
 work or not. Give it a try.

Maybe even the straightforward to!wchar will work!?

Jul 09 2019

Dejan Lekic <dejan.lekic gmail.com> writes:

On Tuesday, 9 July 2019 at 10:34:54 UTC, BoQsc wrote:
 All I know that there was toString16z function from tango 
 project, that made it all work.
 

Now that I browsed the std.utf more, I realised what fits your 
need best is the https://dlang.org/phobos/std_utf.html#toUTF16z

Jul 09 2019

BoQsc <vaidas.boqsc gmail.com> writes:

On Tuesday, 9 July 2019 at 11:11:53 UTC, Dejan Lekic wrote:
 Now that I browsed the std.utf more, I realised what fits your 
 need best is the https://dlang.org/phobos/std_utf.html#toUTF16z

So far, this is what I have:


Filename: myVersion.d

import core.sys.windows.windows : SendMessageTimeoutW;
import core.sys.windows.windows : GetLastError;
import core.sys.windows.windows : ERROR_SUCCESS;
import core.sys.windows.windows : SMTO_ABORTIFHUNG;
import core.sys.windows.windows : LPARAM;
import core.sys.windows.windows : HWND_BROADCAST;
import core.sys.windows.windows : WM_SETTINGCHANGE;

import std.utf;

void main(){
	broadcastSettingChange();

}

void broadcastSettingChange (string envi="Environment", uint 
timeout=1)
{

     auto result = SendMessageTimeoutW(
         HWND_BROADCAST,
         WM_SETTINGCHANGE,
         0,
         envi.toUTF16z,
         SMTO_ABORTIFHUNG,
         timeout,
         null
     );

     if(result == 0)
     {
         auto errCode = GetLastError();
     }
  }



The dmd output:
 C:\Users\User\Desktop>rdmd ref.d
 ref.d(19): Error: function 
 `core.sys.windows.winuser.SendMessageTimeoutW(void*, uint, 
 uint, int, uint, uint, uint*)` is not callable using argument 
 types `(void*, int, int, const(wchar)*, int, uint, 
 typeof(null))`
 ref.d(19):        cannot pass argument 
 `toUTF16z(cast(const(char)[])envi)` of type `const(wchar)*` to 
 parameter `int`
 Failed: ["C:\\D\\dmd2\\windows\\bin\\dmd.exe", "-v", "-o-", 
 "ref.d", "-I."]

Jul 09 2019

a11e99z <black80 bk.ru> writes:

On Tuesday, 9 July 2019 at 12:14:38 UTC, BoQsc wrote:
 On Tuesday, 9 July 2019 at 11:11:53 UTC, Dejan Lekic wrote:
     auto result = SendMessageTimeoutW(
         HWND_BROADCAST,
         WM_SETTINGCHANGE,
         0,
         envi.toUTF16z,
         SMTO_ABORTIFHUNG,
         timeout,
         null
     );
 C:\Users\User\Desktop>rdmd ref.d
 ref.d(19): Error: function 
 `core.sys.windows.winuser.SendMessageTimeoutW(void*, uint, 
 uint, int, uint, uint, uint*)` is not callable using argument 
 types `(void*, int, int, const(wchar)*, int, uint, 
 typeof(null))`
 ref.d(19):        cannot pass argument 
 `toUTF16z(cast(const(char)[])envi)` of type `const(wchar)*` to 
 parameter `int`
 Failed: ["C:\\D\\dmd2\\windows\\bin\\dmd.exe", "-v", "-o-", 
 "ref.d", "-I."]


// add cast to LPARAM for SendMessageTimeoutW
           cast( LPARAM )envi.toUTF16z,

// import lib too somewhere out of main() or in command line
version(Windows) pragma(lib, "user32.lib");

Jul 09 2019

BoQsc <vaidas.boqsc gmail.com> writes:

On Tuesday, 9 July 2019 at 13:10:57 UTC, a11e99z wrote:
 On Tuesday, 9 July 2019 at 12:14:38 UTC, BoQsc wrote:
 On Tuesday, 9 July 2019 at 11:11:53 UTC, Dejan Lekic wrote:
     auto result = SendMessageTimeoutW(
         HWND_BROADCAST,
         WM_SETTINGCHANGE,
         0,
         envi.toUTF16z,
         SMTO_ABORTIFHUNG,
         timeout,
         null
     );
 C:\Users\User\Desktop>rdmd ref.d
 ref.d(19): Error: function 
 `core.sys.windows.winuser.SendMessageTimeoutW(void*, uint, 
 uint, int, uint, uint, uint*)` is not callable using argument 
 types `(void*, int, int, const(wchar)*, int, uint, 
 typeof(null))`
 ref.d(19):        cannot pass argument 
 `toUTF16z(cast(const(char)[])envi)` of type `const(wchar)*` 
 to parameter `int`
 Failed: ["C:\\D\\dmd2\\windows\\bin\\dmd.exe", "-v", "-o-", 
 "ref.d", "-I."]


 // add cast to LPARAM for SendMessageTimeoutW
           cast( LPARAM )envi.toUTF16z,

 // import lib too somewhere out of main() or in command line
 version(Windows) pragma(lib, "user32.lib");

You are absolutely right.

Here is a working example code on how to broadcast environment 
variables changes
from D language to Windows XP, 7, 8, 10 systems, if anyone 
searches for it.

To launch the code:
 rdmd broadcastSignal.d


broadcastSignal.d

import std.utf;
version(Windows) pragma(lib, "user32.lib");

import core.sys.windows.windows : SendMessageTimeoutW;
import core.sys.windows.windows : GetLastError;
import core.sys.windows.windows : ERROR_SUCCESS;
import core.sys.windows.windows : SMTO_ABORTIFHUNG;
import core.sys.windows.windows : LPARAM;
import core.sys.windows.windows : HWND_BROADCAST;
import core.sys.windows.windows : WM_SETTINGCHANGE;



  void main(){
      broadcastSettingChange();

  }

  /**
     Broadcasts a signal to update All Environment variables On 
Windows XP, 7, 8, 10 systems.
     Mostly used update changes to Path environment variable.
     After broadcast of this signal, reopen applications, for 
changes to be visible.

     Date: 07/09/2019
     License: use freely for any purpose

     Params:
         addressBroadcast = "Policy"      When the system sends 
this message as a result of a change in policy settings, this 
parameter points to this string.
                            "intl"        When the system sends 
this message as a result of a change in locale settings, this 
parameter points to this string.
                            "Environment" To effect a change in 
the environment variables for the system or the user, broadcast 
this message with lParam set to this string

     Returns: does not return
     See_Also:
         
https://docs.microsoft.com/lt-lt/windows/win32/api/winuser/nf-winuser-sendmessagetimeouta
         
https://docs.microsoft.com/en-us/windows/win32/winmsg/wm-settingchange
  */
  void broadcastSettingChange (string 
addressBroadcast="Environment", uint timeout=1)
  {
     void* hWnd = HWND_BROADCAST;
     uint  Msg = WM_SETTINGCHANGE;
     uint  wParam = 0;
     int   lParam = cast( LPARAM )addressBroadcast.toUTF16z;
     uint  fuFlags = SMTO_ABORTIFHUNG;
     uint  uTimeout = timeout;
     uint* lpdwResult = null;

     int result = SendMessageTimeoutW(
         hWnd,
         Msg,
         wParam,
         lParam,
         SMTO_ABORTIFHUNG,
         uTimeout,
         lpdwResult
     );

     if(result == 0)
     {
         auto errCode = GetLastError();
     }
   }

Jul 09 2019

BoQsc <vaidas.boqsc gmail.com> writes:

Update: 2022-03-04
ChangeLog:
     * Fixed Typos
     * Added Switch Statement for Command Line Interface Arguments
     * Added Switch Statement for Policy, intl, Environment
     * Added Switch Statement for Error handling: Exit status, 
Error level
     * Increased window "timeout" from 1 to 1000
https://github.com/vaido-world/WM_SETTINGCHANGE

Mar 05 2022

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digitalmars.D.learn - SendMessageTimeoutW requires casting string to uint?