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トップに関する質問unsined charのポインタをstringのvectorでboostの共有メモリで格納し、子プロセスで戻したいが…

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2016/12/24 10:09

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  }
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  ```
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- 12/24 19:08に更新
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+ 12/24 19:08 Chironianさんの回答元に更新しました。

2

コードの修正

2016/12/24 10:09

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@@ -3,12 +3,17 @@
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3
 
4
4
  しかし、問題があり、
5
5
  ```
6
+ vcap >> mat;
7
+
6
8
  MatToBytes(mat, &pBuf );
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9
  std::string sName;
8
- myshmvector->push_back(sName(*pBuf));
10
+ myshmvector->push_back(sName(pBuf));、
9
11
  ```
10
12
  というコードで、MatToBytesにMatと pBufというunsigned charの二重ポインタを引数でとり、格納し、memcpyしたいのですが、
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- 共有メモリのVectorにてStringで格納する際、コンパイルエラーでbasic stringにnot matchingします。
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+ 共有メモリのVectorにてStringで格納する際、
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+ コンパイルエラーでno match for call to ‘(std::string {aka std::basic_string<char>}) (uchar*&)’
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+ myshmvector->push_back(sName(pBuf));
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+
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  二重ポインタのせいなのか、std::stringがbasic_stringに合わないのかわかりません。
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18
 
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19
  どなたかご存じありませんか。どうかよろしくお願いします。
@@ -17,127 +22,135 @@
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  (追記)
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  子プロセスのイテレータのも問題があるようで
19
24
  ```
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+ MyShmStringVector::iterator it;
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+ cv::Mat mat;
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+ cv::VideoCapture vcap(0);
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+ uchar* pBuf = NULL;
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+
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- for(it = myvector->begin(); it !=myvector->end(); ++it){
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+ for(it = myvector->begin(); it !=myvector->end(); ++it){
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- pBuf = (unsigned char*)*it.c_str();
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+ pBuf = (unsigned char*)(*it).c_str();
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- std::memcpy(mat, pBuf, *it->size());
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+ std::memcpy(mat, pBuf, it->size());
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- cv::imshow("window1", mat);
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+ cv::imshow("window1", mat);
24
- }
34
+ }
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35
  ```
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-
36
+ エラーでは
37
+ ‘cv::Mat’ to ‘void*’ for argument ‘1’ to ‘void* memcpy(void*, const void*, size_t)’
27
- it.c_str()というメンバがないといわれます。
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+ std::memcpy(mat, pBuf, it->size());
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+ が出力されます。
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40
  ごちゃごちゃしていてわからないと思いますが、ご教授の方お願いします。
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41
 
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  全体のコードになります。（解りずらいと思いますが、説明下手と状況把握が不十分なので）
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  ```
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- #include <boost/interprocess/managed_shared_memory.hpp>
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+ #include <boost/interprocess/managed_shared_memory.hpp>
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- #include <boost/interprocess/containers/vector.hpp>
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+ #include <boost/interprocess/containers/vector.hpp>
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- #include <boost/interprocess/containers/string.hpp>
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+ #include <boost/interprocess/containers/string.hpp>
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- #include <boost/interprocess/allocators/allocator.hpp>
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+ #include <boost/interprocess/allocators/allocator.hpp>
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- #include <string>
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+ #include <string>
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- #include <opencv2/core/core.hpp>
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+ #include <opencv2/core/core.hpp>
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- #include <opencv2/highgui/highgui.hpp>
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+ #include <opencv2/highgui/highgui.hpp>
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- #include <cstdlib> // std::system
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+ #include <cstdlib> // std::system
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-
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+
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- using namespace boost::interprocess;
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+ using namespace boost::interprocess;
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-
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+
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- typedef unsigned char uchar;
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+ typedef unsigned char uchar;
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-
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+
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- typedef allocator<char, managed_shared_memory::segment_manager> CharAllocator;
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+ typedef allocator<char, managed_shared_memory::segment_manager> CharAllocator;
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-
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+
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- typedef basic_string<char, std::char_traits<char>, CharAllocator> MyShmString;
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+ typedef basic_string<char, std::char_traits<char>, CharAllocator> MyShmString;
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-
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+
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- typedef allocator<MyShmString, managed_shared_memory::segment_manager> StringAllocator;
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+ typedef allocator<MyShmString, managed_shared_memory::segment_manager> StringAllocator;
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-
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+
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- typedef vector<MyShmString, StringAllocator> MyShmStringVector;
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+ typedef vector<MyShmString, StringAllocator> MyShmStringVector;
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-
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+
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- int MatToBytes(cv::Mat image, uchar ** pimage_uchar)
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+ int MatToBytes(cv::Mat image, uchar ** pimage_uchar)
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+ {
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+ uchar * image_uchar = * pimage_uchar;
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+ // class data members of ints
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+ int image_rows = image.rows;
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+ int image_cols = image.cols;
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+ int image_type = image.type();
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+
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+ int image_size = image.total() * image.elemSize();
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+ image_uchar = new uchar[image_size];
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+ std::memcpy(image_uchar, image.data, image_size * sizeof(uchar));
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+ return 1;
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+ }
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+
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+ int main(int argc, char* argv[])
80
+ {
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+
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+ struct shm_remove
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  {
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+ shm_remove(){shared_memory_object::remove("MySharedMemory");}
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+ ~shm_remove(){shared_memory_object::remove("MySharedMemory");}
86
+ }remover;
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+
88
+
89
+ if(argc == 1){ //Parent process
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+ // Remove shared memory on construction and destruction
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+
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+ // Create a new segment with given name and size
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+ managed_shared_memory segment(create_only,"MySharedMemory",65536);
94
+
95
+ //Initialize shared memory STL-compatible allocator
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+ CharAllocator charallocator(segment.get_segment_manager());
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+ StringAllocator stringallocator(segment.get_segment_manager());
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+ //Construct a vector named "MyVector" in shared memory with argument alloc_inst
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+ MyShmStringVector *myshmvector = segment.construct<MyShmStringVector>("MyVector")(stringallocator);
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+
101
+
102
+ cv::Mat InputImage;
103
+ cv::Mat mat;
104
+ cv::VideoCapture vcap(0);
105
+ uchar* pBuf = NULL;
106
+
107
+
108
+ if (!vcap.isOpened())
109
+ return -1;
110
+
111
+ while (1) {
112
+ vcap >> mat;
113
+
114
+ MatToBytes(mat, &pBuf );
115
+ std::string sName;
55
- uchar * image_uchar = * pimage_uchar;
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+ myshmvector->push_back(sName(pBuf));
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+ //Launch child process
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+ if(cv::waitKey(30) >= 0) break;
119
+ }
56
- // class data members of ints
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+ // Launch child process
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- int image_rows = image.rows;
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- int image_cols = image.cols;
121
+ std::string s(argv[0]); s += " child";
59
- int image_type = image.type();
122
+ if(0 != std::system(s.c_str()))
60
-
61
- int image_size = image.total() * image.elemSize();
62
- image_uchar = new uchar[image_size];
63
- std::memcpy(image_uchar, image.data, image_size * sizeof(uchar));
64
123
  return 1;
124
+
125
+ // check child has destroyed the vector
126
+ if(segment.find<MyShmStringVector>("MyVector").first)
127
+ return 1;
65
128
  }
66
-
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-
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-
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- int main(int argc, char* argv[])
70
- {
71
- if(argc == 1){ //Parent process
129
+ else{// child process
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- // Remove shared memory on construction and destruction
130
+ // Open the managed segment
131
+ managed_shared_memory segment(open_only, "MySharedMemory");
73
132
 
74
- /* 初期化など*/
75
- struct shm_remove
76
- {
77
- shm_remove(){shared_memory_object::remove("MySharedMemory");}
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- ~shm_remove(){shared_memory_object::remove("MySharedMemory");}
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- }remover;
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-
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- // Create a new segment with given name and size
133
+ // Find the vector using c-string name
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- managed_shared_memory segment(create_only,"MySharedMemory",65536);
83
-
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- //Initialize shared memory STL-compatible allocator
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- CharAllocator charallocator(segment.get_segment_manager());
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- StringAllocator stringallocator(segment.get_segment_manager());
87
- //Construct a vector named "MyVector" in shared memory with argument alloc_inst
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- MyShmStringVector *myshmvector = segment.construct<MyShmStringVector>("MyVector")(stringallocator);
134
+ MyShmStringVector *myvector = segment.find<MyShmStringVector>("MyVector").first;
135
+
136
+ // Use vector in reverse order
137
+
89
- cv::Mat InputImage;
138
+ MyShmStringVector::iterator it;
90
139
  cv::Mat mat;
91
140
  cv::VideoCapture vcap(0);
92
141
  uchar* pBuf = NULL;
93
-
94
- /* 初期化終了 */
95
142
 
143
+ for(it = myvector->begin(); it !=myvector->end(); ++it){
144
+ pBuf = (unsigned char*)(*it).c_str();
145
+ std::memcpy(mat, pBuf, it->size());
146
+ cv::imshow("window1", mat);
147
+ }
96
148
 
97
- if (!vcap.isOpened()) // もちろんカメラは開いてる
98
- return -1;
99
-
100
- // キーボード押すまでMatを取り続けるんだ
101
- while (1) {
102
- vcap >> mat;
103
-
104
- MatToBytes(mat, &pBuf );
105
- std::string sName;
106
- myshmvector->push_back(sName(*pBuf)); ＜－－ ココがエラー
107
- if(cv::waitKey(30) >= 0) break;
108
- }
109
- // Launch child process
110
- std::string s(argv[0]); s += " child";
111
- if(0 != std::system(s.c_str()))
112
- return 1;
113
-
114
- // check child has destroyed the vector
115
- if(segment.find<MyShmStringVector>("MyVector").first)
116
- return 1;
117
- }
118
- else{// child process
119
- // Open the managed segment
120
- managed_shared_memory segment(open_only, "MySharedMemory");
121
-
122
- // Find the vector using c-string name
123
- MyShmStringVector *myvector = segment.find<MyShmStringVector>("MyVector").first;
124
-
125
- // Use vector in reverse order
126
-
127
- MyShmStringVector::iterator it;
128
- cv::Mat mat;
129
- cv::VideoCapture vcap(0);
130
- uchar* pBuf = NULL;
131
-
132
- for(it = myvector->begin(); it !=myvector->end(); ++it){
133
- pBuf = (unsigned char*)*it.c_str();
134
- std::memcpy(mat, pBuf, *it->size());
135
- cv::imshow("window1", mat);
136
- }
137
-
138
- segment.destroy<MyShmStringVector>("MyVector");
149
+ segment.destroy<MyShmStringVector>("MyVector");
139
-
140
- }
150
+
141
- return 0;
142
151
  }
152
+ return 0;
153
+ }
143
- ```
154
+ ```
155
+
156
+ 12/24 19:08に更新

1

初心者マーク

2016/12/24 10:08

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スコア62

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