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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
//==============================================================================
//
// DO NO MODIFY THE CONTENT OF THIS FILE
//
// This file contains the generic CFPlug-in code necessary for your importer
// To complete your importer implement the function in GetMetadataForFile.c
//
//==============================================================================
#include <CoreFoundation/CoreFoundation.h>
#include <CoreFoundation/CFPlugInCOM.h>
#include <CoreServices/CoreServices.h>
// -----------------------------------------------------------------------------
// constants
// -----------------------------------------------------------------------------
#define PLUGIN_ID "75799363-D9EE-487C-BD3D-5DEFFD396CBB"
//
// Below is the generic glue code for all plug-ins.
//
// You should not have to modify this code aside from changing
// names if you decide to change the names defined in the Info.plist
//
// -----------------------------------------------------------------------------
// typedefs
// -----------------------------------------------------------------------------
// The import function to be implemented in GetMetadataForFile.c
Boolean GetMetadataForFile(void *thisInterface,
CFMutableDictionaryRef attributes,
CFStringRef contentTypeUTI,
CFStringRef pathToFile);
// The layout for an instance of MetaDataImporterPlugIn
typedef struct __MetadataImporterPluginType
{
MDImporterInterfaceStruct *conduitInterface;
CFUUIDRef factoryID;
UInt32 refCount;
} MetadataImporterPluginType;
// -----------------------------------------------------------------------------
// prototypes
// -----------------------------------------------------------------------------
// Forward declaration for the IUnknown implementation.
//
MetadataImporterPluginType *AllocMetadataImporterPluginType(CFUUIDRef inFactoryID);
void DeallocMetadataImporterPluginType(MetadataImporterPluginType *thisInstance);
HRESULT MetadataImporterQueryInterface(void *thisInstance,REFIID iid,LPVOID *ppv);
void *MetadataImporterPluginFactory(CFAllocatorRef allocator,CFUUIDRef typeID);
ULONG MetadataImporterPluginAddRef(void *thisInstance);
ULONG MetadataImporterPluginRelease(void *thisInstance);
// -----------------------------------------------------------------------------
// testInterfaceFtbl definition
// -----------------------------------------------------------------------------
// The TestInterface function table.
//
static MDImporterInterfaceStruct testInterfaceFtbl = {
NULL,
MetadataImporterQueryInterface,
MetadataImporterPluginAddRef,
MetadataImporterPluginRelease,
GetMetadataForFile
};
// -----------------------------------------------------------------------------
// AllocMetadataImporterPluginType
// -----------------------------------------------------------------------------
// Utility function that allocates a new instance.
// You can do some initial setup for the importer here if you wish
// like allocating globals etc...
//
MetadataImporterPluginType *AllocMetadataImporterPluginType(CFUUIDRef inFactoryID)
{
MetadataImporterPluginType *theNewInstance;
theNewInstance = (MetadataImporterPluginType *)malloc(sizeof(MetadataImporterPluginType));
memset(theNewInstance,0,sizeof(MetadataImporterPluginType));
/* Point to the function table */
theNewInstance->conduitInterface = &testInterfaceFtbl;
/* Retain and keep an open instance refcount for each factory. */
theNewInstance->factoryID = CFRetain(inFactoryID);
CFPlugInAddInstanceForFactory(inFactoryID);
/* This function returns the IUnknown interface so set the refCount to one. */
theNewInstance->refCount = 1;
return theNewInstance;
}
// -----------------------------------------------------------------------------
// DeallocSpotlightImporterMDImporterPluginType
// -----------------------------------------------------------------------------
// Utility function that deallocates the instance when
// the refCount goes to zero.
// In the current implementation importer interfaces are never deallocated
// but implement this as this might change in the future
//
void DeallocMetadataImporterPluginType(MetadataImporterPluginType *thisInstance)
{
CFUUIDRef theFactoryID;
theFactoryID = thisInstance->factoryID;
free(thisInstance);
if (theFactoryID){
CFPlugInRemoveInstanceForFactory(theFactoryID);
CFRelease(theFactoryID);
}
}
// -----------------------------------------------------------------------------
// MetadataImporterQueryInterface
// -----------------------------------------------------------------------------
// Implementation of the IUnknown QueryInterface function.
//
HRESULT MetadataImporterQueryInterface(void *thisInstance,REFIID iid,LPVOID *ppv)
{
CFUUIDRef interfaceID;
interfaceID = CFUUIDCreateFromUUIDBytes(kCFAllocatorDefault,iid);
if (CFEqual(interfaceID,kMDImporterInterfaceID)){
/* If the Right interface was requested, bump the ref count,
* set the ppv parameter equal to the instance, and
* return good status.
*/
((MetadataImporterPluginType*)thisInstance)->conduitInterface->AddRef(thisInstance);
*ppv = thisInstance;
CFRelease(interfaceID);
return S_OK;
}else{
if (CFEqual(interfaceID,IUnknownUUID)){
/* If the IUnknown interface was requested, same as above. */
((MetadataImporterPluginType*)thisInstance )->conduitInterface->AddRef(thisInstance);
*ppv = thisInstance;
CFRelease(interfaceID);
return S_OK;
}else{
/* Requested interface unknown, bail with error. */
*ppv = NULL;
CFRelease(interfaceID);
return E_NOINTERFACE;
}
}
}
// -----------------------------------------------------------------------------
// MetadataImporterPluginAddRef
// -----------------------------------------------------------------------------
// Implementation of reference counting for this type. Whenever an interface
// is requested, bump the refCount for the instance. NOTE: returning the
// refcount is a convention but is not required so don't rely on it.
//
ULONG MetadataImporterPluginAddRef(void *thisInstance)
{
((MetadataImporterPluginType *)thisInstance )->refCount += 1;
return ((MetadataImporterPluginType*) thisInstance)->refCount;
}
// -----------------------------------------------------------------------------
// SampleCMPluginRelease
// -----------------------------------------------------------------------------
// When an interface is released, decrement the refCount.
// If the refCount goes to zero, deallocate the instance.
//
ULONG MetadataImporterPluginRelease(void *thisInstance)
{
((MetadataImporterPluginType*)thisInstance)->refCount -= 1;
if (((MetadataImporterPluginType*)thisInstance)->refCount == 0){
DeallocMetadataImporterPluginType((MetadataImporterPluginType*)thisInstance );
return 0;
}else{
return ((MetadataImporterPluginType*) thisInstance )->refCount;
}
}
// -----------------------------------------------------------------------------
// SpotlightImporterMDImporterPluginFactory
// -----------------------------------------------------------------------------
// Implementation of the factory function for this type.
//
void *MetadataImporterPluginFactory(CFAllocatorRef allocator,CFUUIDRef typeID)
{
MetadataImporterPluginType *result;
CFUUIDRef uuid;
/* If correct type is being requested, allocate an
* instance of TestType and return the IUnknown interface.
*/
if (CFEqual(typeID,kMDImporterTypeID)){
uuid = CFUUIDCreateFromString(kCFAllocatorDefault,CFSTR(PLUGIN_ID));
result = AllocMetadataImporterPluginType(uuid);
CFRelease(uuid);
return result;
}
/* If the requested type is incorrect, return NULL. */
return NULL;
}
|
