Add windows implementation

src/dialogs.h

@@ -11,4 +11,80 @@ class Dialog {
     static std::string save_file();
 }; // namespace Dialog
 
-#endif  // JUCI_DIALOG_H_
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
+#define NTDDI_VERSION NTDDI_VISTA
+#define _WIN32_WINNT _WIN32_WINNT_VISTA
+
+#include <windows.h>
+#include <shobjidl.h>
+
+#include <memory>
+#include <sstream>
+#include <codecvt>
+#include "singletons.h"
+
+#ifndef check
+HRESULT __hr__;
+#define check(__fun__, error_message)            \
+  __hr__ = __fun__;                              \
+  if (FAILED(__hr__)) {                          \
+    Singleton::terminal()->print(error_message); \
+    throw std::exception(error_message);
+  }
+#endif
+
+
+// http://stackoverflow.com/questions/4804298/how-to-convert-wstring-into-string
+std::wstring s2ws(const std::string& str) {
+  typedef std::codecvt_utf8<wchar_t> convert_typeX;
+  std::wstring_convert<convert_typeX, wchar_t> converterX;
+  return converterX.from_bytes(str);
+}
+
+std::string ws2s(const std::wstring& wstr) {
+  typedef std::codecvt_utf8<wchar_t> convert_typeX;
+  std::wstring_convert<convert_typeX, wchar_t> converterX;
+  return converterX.to_bytes(wstr);
+}
+
+class WinString {
+public:
+  WinString() : str(nullptr) { }
+  WinString(const std::string &string);
+  ~WinString() { CoTaskMemFree(static_cast<void*>(str)); }
+  std::string operator()();
+  wchar_t** operator&() { return &str; }
+private:
+  wchar_t* str;
+};
+
+class CommonDialog {
+public:
+  CommonDialog(CLSID type);
+  void add_option(unsigned option);
+  void set_title(const std::string &title);
+  std::string show();
+
+private:
+  IFileDialog * dialog;
+  DWORD options;
+};
+
+class OpenDialog : public CommonDialog {
+public:
+  OpenDialog(const std::string &title, unsigned option) : CommonDialog(CLSID_FileOpenDialog) {
+    set_title(title);
+    add_option(option);
+  }
+};
+
+class SaveDialog : public CommonDialog {
+public:
+  SaveDialog(const std::string &title, unsigned option) : CommonDialog(CLSID_FileSaveDialog) {
+    set_title(title);
+    add_option(option);
+  }
+};
+#endif
+#endif  // JUCI_DIALOG_H_

src/dialogs_win.cc

@@ -1,24 +1,70 @@
 #ifdef _WIN32
 #include "dialogs.h"
-#include <dialogs_win.h>
 
+// { WIN_STRING
+WinString::WinString(const std::string &string) {
+  std::wstringstream ss;
+    ss << s2ws(string);
+    ss >> str;
+}
+
+WinString::operator()() {
+  std::string res;
+  if (str != nullptr) {
+    std::wstring ss(str);
+    res = ws2s(ss);
+  }
+  return res;
+}
+// WIN_STRING }
+
+// { COMMON_DIALOG
+CommonDialog::CommonDialog(CLSID type) : dialog(nullptr) {
+    check(CoCreateInstance(type, nullptr, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&dialog)), "Failed to create instance");
+    check(dialog->GetOptions(&options), "Failed to get options from instance");
+}
+
+void CommonDialog::set_title(const std::string &title) {
+    auto tmp = std::wstring(title.begin(), title.end());
+    auto t = tmp.data();
+    check(dialog->SetTitle(t), "Failed to set dialog title");
+}
+
+void CommonDialog::add_option(unsigned option) {
+  check(dialog->SetOptions(options | option), "Failed to set options");
+}
+
+std::string CommonDialog::show() {
+  try {
+    check(dialog->Show(nullptr), "Failed to show dialog");
+    IShellItem *result = nullptr;
+    check(dialog->GetResult(&result), "Failed to get result from dialog");
+    win_string str;
+    check(result->GetDisplayName(SIGDN_FILESYSPATH, &str), "Failed to get display name from dialog");
+    result->Release();
+    return str();
+  } catch (std::exception e) {
+    return "";
+  }
+}
+// COMMON_DIALOG }}
 std::string Dialog::select_folder() {
-  return c_select_folder();
+  return (OpenDialog("Select folder", FOS_PICKFOLDERS)).show();
 }
 
 std::string Dialog::new_file() {
-  return c_new_file();
+  return (SaveDialog("Please choose your destination", 0)).show();
 }
 
 std::string Dialog::new_folder() {
-  return c_new_folder();
+  return Dialog::select_folder();
 }
 
 std::string Dialog::select_file() {
-  return c_select_file();
+  return (OpenDialog("Open file", 0)).show();
 }
 
 std::string Dialog::save_file() {
-  return c_save_file();
+  return (SaveDialog("Please choose your destination", 0)).show();
 }
 #endif