added a C++ API

example/executable.cpp

@@ -0,0 +1,101 @@
+#include <iostream>
+
+#include <whereami++.h>
+
+#if defined(_WIN32)
+
+#define WIN32_LEAN_AND_MEAN
+#if defined(_MSC_VER)
+#pragma warning(push, 3)
+#endif
+#include <windows.h>
+
+#define RTLD_LAZY 1
+#define RTLD_NOW 2
+#define RTLD_GLOBAL 4
+#define RTLD_LOCAL 8
+
+static void* dlopen(const char* fileName, int mode)
+{
+  wchar_t buffer[MAX_PATH];
+
+  if (MultiByteToWideChar(CP_UTF8, 0, fileName, -1, buffer, sizeof(buffer) / sizeof(*buffer)))
+  {
+    wchar_t buffer_[MAX_PATH];
+
+    GetFullPathNameW(buffer, sizeof(buffer_) / sizeof(*buffer_), buffer_, NULL);
+
+    return (void*)LoadLibraryW(buffer_);
+  }
+
+  return NULL;
+}
+
+static int dlclose(void* handle)
+{
+  return FreeLibrary((HMODULE)handle) ? 0 : -1;
+}
+
+static const char* dlerror(void)
+{
+  DWORD error;
+
+  error = GetLastError();
+
+  if (error)
+  {
+    static char message[1024];
+
+    FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, error, MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT), message, sizeof(message), NULL);
+
+    return message;
+  }
+
+  return "no error";
+}
+
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+
+#else
+
+#include <dlfcn.h>
+
+#endif
+
+int main(int argc, char** argv)
+{
+  std::cout << "executable path: " << whereami::getExecutablePath() << std::endl;
+  whereami::whereami_path_t executablePath = whereami::getExecutablePath();
+  std::cout << "  dirname: " << executablePath.dirname() << std::endl;
+  std::cout << "  basename: " << executablePath.basename() << std::endl;
+
+  std::cout << "module path: " << whereami::getModulePath() << std::endl;
+  whereami::whereami_path_t modulePath = whereami::getModulePath();
+  std::cout << "  dirname: " << modulePath.dirname() << std::endl;
+  std::cout << "  basename: " << modulePath.basename() << std::endl;
+
+  for (int i = 1; i < argc; ++i)
+  {
+    std::string prefix = "--load-library=";
+    std::string arg = std::string(argv[i]);
+
+    if (arg.compare(0, prefix.length(), prefix) == 0)
+    {
+      std::string name = arg.substr(prefix.length());
+      void* handle;
+
+      std::cout << std::endl;
+
+      handle = dlopen(name.c_str(), RTLD_NOW);
+      if (!handle)
+        std::cout << "failed to load library: " << dlerror() << std::endl;
+
+      if (handle)
+        dlclose(handle);
+    }
+  }
+
+  return 0;
+}

example/library.cpp

@@ -0,0 +1,61 @@
+#include <iostream>
+
+#include <whereami++.h>
+
+#if defined(__GNUC__) && !defined(_WIN32)
+__attribute__((constructor))
+#endif
+static void load()
+{
+  std::cout << "library loaded" << std::endl;
+
+  std::cout << "executable path: " << whereami::getExecutablePath() << std::endl;
+  whereami::whereami_path_t executablePath = whereami::getExecutablePath();
+  std::cout << "  dirname: " << executablePath.dirname() << std::endl;
+  std::cout << "  basename: " << executablePath.basename() << std::endl;
+
+  std::cout << "module path: " << whereami::getModulePath() << std::endl;
+  whereami::whereami_path_t modulePath = whereami::getModulePath();
+  std::cout << "  dirname: " << modulePath.dirname() << std::endl;
+  std::cout << "  basename: " << modulePath.basename() << std::endl;
+}
+
+#if defined(__GNUC__) && !defined(_WIN32)
+__attribute__((destructor))
+#endif
+static void unload()
+{
+  std::cout << "library unloaded" << std::endl;
+}
+
+#if defined(_WIN32)
+
+#define WIN32_LEAN_AND_MEAN
+#if defined(_MSC_VER)
+#pragma warning(push, 3)
+#endif
+#include <windows.h>
+
+BOOL APIENTRY DllMain(HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)
+{
+  switch (ul_reason_for_call)
+  {
+    case DLL_PROCESS_ATTACH:
+      load();
+      break;
+    case DLL_THREAD_ATTACH:
+      break;
+    case DLL_THREAD_DETACH:
+      break;
+    case DLL_PROCESS_DETACH:
+      unload();
+      break;
+  }
+  return TRUE;
+}
+
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+
+#endif