ae.sys.windows.exception source code

1 /**
2  * Windows exceptions.
3  *
4  * License:
5  *   This Source Code Form is subject to the terms of
6  *   the Mozilla Public License, v. 2.0. If a copy of
7  *   the MPL was not distributed with this file, You
8  *   can obtain one at http://mozilla.org/MPL/2.0/.
9  *
10  * Authors:
11  *   Vladimir Panteleev <vladimir@thecybershadow.net>
12  */
13 
14 module ae.sys.windows.exception;
15 
16 import core.sys.windows.windows;
17 
18 import std.string;
19 
20 import ae.sys.windows.text;
21 
22 class WindowsException : Exception
23 {
24 	DWORD code;
25 
26 	this(DWORD code, string str=null)
27 	{
28 		this.code = code;
29 
30 		wchar *lpMsgBuf = null;
31 		FormatMessageW(
32 			FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
33 			null,
34 			code,
35 			MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
36 			cast(LPWSTR)&lpMsgBuf,
37 			0,
38 			null);
39 
40 		auto message = lpMsgBuf.fromWString();
41 		if (lpMsgBuf)
42 			LocalFree(lpMsgBuf);
43 
44 		message = strip(message);
45 		message ~= format(" (error %d)", code);
46 		if (str)
47 			message = str ~ ": " ~ message;
48 
49 		super(message);
50 	}
51 }
52 
53 T wenforce(T)(T cond, string str=null)
54 {
55 	if (cond)
56 		return cond;
57 
58 	throw new WindowsException(GetLastError(), str);
59 }