質問編集履歴

書式

2016/12/24 10:09

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@@ -308,4 +308,4 @@
-12/24 19:08に更新
+12/24 19:08 Chironianさんの回答元に更新しました。

コードの修正

2016/12/24 10:09

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@@ -8,17 +8,27 @@
 ```
+    vcap >> mat;
     MatToBytes(mat, &pBuf );
     std::string sName;
-    myshmvector->push_back(sName(*pBuf));
+    myshmvector->push_back(sName(pBuf));、
 ```
 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、
-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。
+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no match for call to ‘(std::string {aka std::basic_string<char>}) (uchar*&)’
+   myshmvector->push_back(sName(pBuf));
 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。
@@ -36,21 +46,35 @@
 ```
+      MyShmStringVector::iterator it;
+      cv::Mat mat;
+      cv::VideoCapture vcap(0);
+      uchar* pBuf = NULL;
-            for(it = myvector->begin(); it !=myvector->end(); ++it){
+      for(it = myvector->begin(); it !=myvector->end(); ++it){
-                pBuf = (unsigned char*)*it.c_str();
+            pBuf = (unsigned char*)(*it).c_str();
-                std::memcpy(mat, pBuf, *it->size());
+            std::memcpy(mat, pBuf, it->size());
-                cv::imshow("window1", mat);
+            cv::imshow("window1", mat);
-            }
+      }
-```
+```
+エラーでは
+‘cv::Mat’ to ‘void*’ for argument ‘1’ to ‘void* memcpy(void*, const void*, size_t)’
-it.c_str()というメンバがないといわれます。
+    std::memcpy(mat, pBuf, it->size());
+が出力されます。
 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。
@@ -60,121 +84,195 @@
 ```
-    #include <boost/interprocess/managed_shared_memory.hpp>
-    #include <boost/interprocess/containers/vector.hpp>
-    #include <boost/interprocess/containers/string.hpp>
-    #include <boost/interprocess/allocators/allocator.hpp>
-    #include <string>
-    #include <opencv2/core/core.hpp>
-    #include <opencv2/highgui/highgui.hpp>
-    #include <cstdlib> // std::system
-    using namespace boost::interprocess;
-    typedef unsigned char uchar;
-    typedef allocator<char, managed_shared_memory::segment_manager> CharAllocator;
-    typedef basic_string<char, std::char_traits<char>, CharAllocator> MyShmString;
-    typedef allocator<MyShmString, managed_shared_memory::segment_manager> StringAllocator;
-    typedef vector<MyShmString, StringAllocator> MyShmStringVector;
-    int MatToBytes(cv::Mat image, uchar ** pimage_uchar)
+#include <boost/interprocess/managed_shared_memory.hpp>
+#include <boost/interprocess/containers/vector.hpp>
+#include <boost/interprocess/containers/string.hpp>
+#include <boost/interprocess/allocators/allocator.hpp>
+#include <string>
+#include <opencv2/core/core.hpp>
+#include <opencv2/highgui/highgui.hpp>
+#include <cstdlib> // std::system
+using namespace boost::interprocess;
+typedef unsigned char uchar;
+typedef allocator<char, managed_shared_memory::segment_manager> CharAllocator;
+typedef basic_string<char, std::char_traits<char>, CharAllocator> MyShmString;
+typedef allocator<MyShmString, managed_shared_memory::segment_manager> StringAllocator;
+typedef vector<MyShmString, StringAllocator> MyShmStringVector;
+int MatToBytes(cv::Mat image, uchar ** pimage_uchar)
+{
+    uchar * image_uchar = * pimage_uchar;
+    // class data members of ints
+    int image_rows = image.rows;
+    int image_cols = image.cols;
+    int image_type = image.type();
+    int image_size = image.total() * image.elemSize();
+    image_uchar = new uchar[image_size];
+    std::memcpy(image_uchar, image.data, image_size * sizeof(uchar));
+    return 1;
+}
+int main(int argc, char* argv[])
+{
+    struct shm_remove
     {
+        shm_remove(){shared_memory_object::remove("MySharedMemory");}
+        ~shm_remove(){shared_memory_object::remove("MySharedMemory");}
+    }remover;
+    if(argc == 1){ //Parent process
+        // Remove shared memory on construction and destruction
+    // Create a new segment with given name and size
+    managed_shared_memory segment(create_only,"MySharedMemory",65536);
+    //Initialize shared memory STL-compatible allocator
+    CharAllocator charallocator(segment.get_segment_manager());
+    StringAllocator stringallocator(segment.get_segment_manager());
+    //Construct a vector named "MyVector" in shared memory with argument alloc_inst
+    MyShmStringVector *myshmvector = segment.construct<MyShmStringVector>("MyVector")(stringallocator);
+    cv::Mat InputImage;
+    cv::Mat mat;
+    cv::VideoCapture vcap(0);
+    uchar* pBuf = NULL;
+    if (!vcap.isOpened())
+        return -1;
+    while (1) {
+        vcap >> mat;
+        MatToBytes(mat, &pBuf );
+        std::string sName;
-        uchar * image_uchar = * pimage_uchar;
+        myshmvector->push_back(sName(pBuf));
+        //Launch child process
+        if(cv::waitKey(30) >= 0) break;
+    }
-        // class data members of ints
+    // Launch child process
-        int image_rows = image.rows;
-        int image_cols = image.cols;
+    std::string s(argv[0]); s += " child";
-        int image_type = image.type();
+    if(0 != std::system(s.c_str()))
-        int image_size = image.total() * image.elemSize();
-        image_uchar = new uchar[image_size];
-        std::memcpy(image_uchar, image.data, image_size * sizeof(uchar));
         return 1;
+    // check child has destroyed the vector
+    if(segment.find<MyShmStringVector>("MyVector").first)
+        return 1;
     }
-    int main(int argc, char* argv[])
-    {
-        if(argc == 1){ //Parent process
+    else{// child process
-            // Remove shared memory on construction and destruction
-            /* 初期化など*/
-            struct shm_remove
-            {
-                shm_remove(){shared_memory_object::remove("MySharedMemory");}
-                ~shm_remove(){shared_memory_object::remove("MySharedMemory");}
-            }remover;
-        // Create a new segment with given name and size
+        // Open the managed segment
-        managed_shared_memory segment(create_only,"MySharedMemory",65536);
+        managed_shared_memory segment(open_only, "MySharedMemory");
-        //Initialize shared memory STL-compatible allocator
+        // Find the vector using c-string name
-        CharAllocator charallocator(segment.get_segment_manager());
-        StringAllocator stringallocator(segment.get_segment_manager());
-        //Construct a vector named "MyVector" in shared memory with argument alloc_inst
-        MyShmStringVector *myshmvector = segment.construct<MyShmStringVector>("MyVector")(stringallocator);
+        MyShmStringVector *myvector = segment.find<MyShmStringVector>("MyVector").first;
+        // Use vector in reverse order
-        cv::Mat InputImage;
+        MyShmStringVector::iterator it;
         cv::Mat mat;
@@ -182,104 +280,32 @@
         uchar* pBuf = NULL;
-        /* 初期化終了 */
-        if (!vcap.isOpened()) // もちろんカメラは開いてる
-            return -1;
-        // キーボード押すまでMatを取り続けるんだ
-        while (1) {
-            vcap >> mat;
-            MatToBytes(mat, &pBuf );
-            std::string sName;
-            myshmvector->push_back(sName(*pBuf)); ＜－－ ココがエラー
+        for(it = myvector->begin(); it !=myvector->end(); ++it){
-            if(cv::waitKey(30) >= 0) break;
+            pBuf = (unsigned char*)(*it).c_str();
+            std::memcpy(mat, pBuf, it->size());
+            cv::imshow("window1", mat);
         }
-        // Launch child process
-        std::string s(argv[0]); s += " child";
-        if(0 != std::system(s.c_str()))
-            return 1;
-        // check child has destroyed the vector
-        if(segment.find<MyShmStringVector>("MyVector").first)
-            return 1;
-        }
-        else{// child process
-            // Open the managed segment
-            managed_shared_memory segment(open_only, "MySharedMemory");
-            // Find the vector using c-string name
-            MyShmStringVector *myvector = segment.find<MyShmStringVector>("MyVector").first;
-            // Use vector in reverse order
-            MyShmStringVector::iterator it;
-            cv::Mat mat;
-            cv::VideoCapture vcap(0);
-            uchar* pBuf = NULL;
-            for(it = myvector->begin(); it !=myvector->end(); ++it){
-                pBuf = (unsigned char*)*it.c_str();
-                std::memcpy(mat, pBuf, *it->size());
-                cv::imshow("window1", mat);
-            }
-            segment.destroy<MyShmStringVector>("MyVector");
+        segment.destroy<MyShmStringVector>("MyVector");
-        }
-        return 0;
     }
+    return 0;
+}
-```
+```
+12/24 19:08に更新

初心者マーク

2016/12/24 10:08

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