correct verion of plugin

Installation/Windows/Plugins/SharedMemory/Contrib/SharedMem.c

@@ -34,13 +34,13 @@ extra_parameters* g_extra = NULL;
 /// handle for the memory segment
 ///////////////////////////////////////////////////////////
 
-HANDLE hMapFile = NULL;
+// HANDLE hMapFile = NULL;
 
 ///////////////////////////////////////////////////////////
 /// content of the memory segment
 ///////////////////////////////////////////////////////////
 
-LPCTSTR pBuf = NULL;
+// LPCTSTR pBuf = NULL;
 
 ///////////////////////////////////////////////////////////
 /// content of the memory segment
@@ -88,7 +88,8 @@ void PushReturnValue(int value);
 
 PUBLIC_FUNCTION(CreateSharedMemory)
 {
-
+  HANDLE hMapFile = NULL;
+  LPCTSTR pBuf = NULL;
   TCHAR * szName = SHARED_MEM_SEGMENT;
   SECURITY_ATTRIBUTES attr;
   attr.bInheritHandle = 1;
@@ -139,16 +140,45 @@ PUBLIC_FUNCTION_END
 
 PUBLIC_FUNCTION(WriteIntoSharedMem)
 {
-   if(!pBuf) {
-    PushReturnValue(-1);
-     return;
-   }
+  HANDLE hMapFile = NULL;
+  LPCTSTR pBuf = NULL;
 
   TCHAR * szMsg = (TCHAR*)LocalAlloc(LPTR, g_string_size * sizeof(TCHAR));
   if (!szMsg) {
     PushReturnValue(-2); // memory could not be allocated
     return;
   }
+  hMapFile = OpenFileMapping(
+    FILE_MAP_WRITE,        // read/write access
+    FALSE,                 // do not inherit the name
+    SHARED_MEM_SEGMENT);               // name of mapping object
+
+  if (hMapFile == NULL)
+  {
+    PushReturnValue(GetLastError());
+    // _tprintf(TEXT("Could not open file mapping object (%d).\n"),
+    //  GetLastError());
+    return;
+  }
+
+  pBuf = (LPTSTR)MapViewOfFile(hMapFile, // handle to map object
+    FILE_MAP_ALL_ACCESS,  // read/write permission
+    0,
+    0,
+    BUF_SIZE);
+
+  if (pBuf == NULL)
+  {
+    // _tprintf(TEXT("Could not map view of file (%d).\n"),
+    //   GetLastError());
+
+    PushReturnValue(GetLastError());
+
+    CloseHandle(hMapFile);
+
+    return;
+  }
+
   // read name for mem segment from stack
   popstring(szMsg);
   CopyMemory((PVOID)pBuf, szMsg, (_tcslen(szMsg) * sizeof(TCHAR)));
@@ -164,14 +194,13 @@ PUBLIC_FUNCTION_END
 
 PUBLIC_FUNCTION(ReadIntoSharedMem)
 {
-  HANDLE hMapFile;
-  LPCTSTR pBuf;
-  TCHAR * szName = SHARED_MEM_SEGMENT;
+  HANDLE hMapFile = NULL;
+  LPCTSTR pBuf = NULL;
 
   hMapFile = OpenFileMapping(
     FILE_MAP_WRITE,        // read/write access
     FALSE,                 // do not inherit the name
-    szName);               // name of mapping object
+    SHARED_MEM_SEGMENT);               // name of mapping object
 
   if (hMapFile == NULL)
   {
@@ -210,17 +239,22 @@ PUBLIC_FUNCTION(ReadIntoSharedMem)
 }
 PUBLIC_FUNCTION_END
 
-PUBLIC_FUNCTION(RemoveSharedMem) 
+PUBLIC_FUNCTION(ExistsSharedMem)
 { 
-  if(pBuf) { 
-    UnmapViewOfFile(pBuf);
-    CloseHandle(hMapFile);
-    pBuf = NULL;
-    hMapFile = NULL;
-    PushReturnValue(0);
+  HANDLE hMapFile = NULL;
+
+  hMapFile = OpenFileMapping(
+    FILE_MAP_WRITE,        // read/write access
+    FALSE,                 // do not inherit the name
+    SHARED_MEM_SEGMENT);               // name of mapping object
+
+  if (hMapFile == NULL)
+  {
+    PushReturnValue(GetLastError());
+    // _tprintf(TEXT("Could not open file mapping object (%d).\n"),
+    //  GetLastError());
     return;
   }
-  PushReturnValue(GetLastError());
 }
 
 PUBLIC_FUNCTION_END