blob: 4a8c4f5461bd152b100a92dc5f38de974002c88d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) 2008-2011 ZenJu (zhnmju123 AT gmx.de) *
// **************************************************************************
//
#ifndef COM_UTILITY_HEADER
#define COM_UTILITY_HEADER
#include "com_ptr.h"
#include <string>
#include <cassert>
namespace util
{
//get an enumeration interface as a std::vector of bound(!) ComPtr(s)
template <class T, class U>
std::vector<ComPtr<T> > convertEnum(const ComPtr<U>& enumObj); //enumObj: must have the "_NewEnum" property that supports the IEnumUnknown interface
/*
extract text from com object member function returning a single BSTR: HRESULT ComInterface::MemFun([out] BSTR *pbstr);
Example: ComPtr<...> comObj =...;
std::wstring description = getText(comObj, &IUPnPDevice::get_Description);
*/
template <class T, class MemFun>
std::wstring getText(ComPtr<T> comObj, MemFun memFun);
//RAII class handling BSTR
class Bstring
{
public:
Bstring(const std::wstring& str) { str_ = ::SysAllocStringLen(str.data(), str.length()); } //string::data() returns unmodified string potentially containing 0-values
~Bstring() { if (str_) ::SysFreeString(str_); }
const BSTR get() const { return str_; }
private:
Bstring(const Bstring&); //not implemented
Bstring& operator=(const Bstring&); //
BSTR str_;
};
//############################ inline implemenatation ##################################
template <class T, class U>
inline
std::vector<ComPtr<T> > convertEnum(const ComPtr<U>& enumObj)
{
std::vector<ComPtr<T> > output;
if (enumObj)
{
ComPtr<IUnknown> unknown;
enumObj->get__NewEnum(unknown.init());
ComPtr<IEnumUnknown> enumUnknown = com_dynamic_cast<IEnumUnknown>(unknown);
assert(enumUnknown); //IEnumUnknown must be supported!
if (enumUnknown)
{
ComPtr<IUnknown> itemTmp;
while (enumUnknown->Next(1, itemTmp.init(), NULL) == S_OK) //returns S_FALSE == 1 when finished! Don't use SUCCEEDED()!!!
{
ComPtr<T> itemNew = com_dynamic_cast<T>(itemTmp);
if (itemNew)
output.push_back(itemNew);
}
}
}
return output;
}
template <class T, class MemFun>
inline
std::wstring getText(ComPtr<T> comObj, MemFun memFun)
{
std::wstring text;
{
if (!comObj)
return std::wstring();
BSTR bstr = NULL;
if (FAILED((comObj.get()->*memFun)(&bstr)))
return std::wstring();
if (bstr) //NULL means "no text"
{
text = std::wstring(bstr, ::SysStringLen(bstr)); //correctly copy 0-characters
::SysFreeString(bstr);
}
}
return text;
}
}
#endif //COM_UTILITY_HEADER
|
