ADD: simple library loader to test packages

SuperBuild/Packaging/Files/otb_loader.cxx

+/*
+ * Copyright (C) 2005-2017 Centre National d'Etudes Spatiales (CNES)
+ *
+ * This file is part of Orfeo Toolbox
+ *
+ *     https://www.orfeo-toolbox.org/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#include <windows.h>
+#else
+#include <dlfcn.h>
+#endif
+
+#include <iostream>
+
+int main(int argc, char *argv[])
+{
+  if (argc < 2)
+    {
+    std::cout << "Usage : "<< argv[0] << "  library_file" << std::endl;
+    return 1;
+    }
+  const char* input = argv[1];
+#if defined(_WIN32) && !defined(__CYGWIN__)
+  HMODULE library = LoadLibrary(input);
+  if (library == NULL)
+    {
+    std::cout << "Failed to load "<< input << std::endl;
+    LPVOID lpMsgBuf=NULL;
+    FormatMessage(
+      FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+      NULL,
+      GetLastError(),
+      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
+      (LPTSTR) &lpMsgBuf,
+      0,
+      NULL
+      );
+    if(lpMsgBuf)
+      {
+      std::cout << (char*)lpMsgBuf << std::endl;
+      LocalFree( lpMsgBuf );
+      }
+    }
+  else
+    {
+    FreeLibrary(library);
+    }
+#else
+  void* library = dlopen(input, RTLD_LAZY);
+  if (library == NULL)
+    {
+    std::cout << "Failed to load "<< input << std::endl;
+    std::cout << dlerror() << std::endl;
+    }
+  else
+    {
+    dlclose(library);
+    }
+#endif
+  return 0;
+}