link gui with common; reimplement finding personal and profile directories on windows (not yet used)

src/lib/common/win32/DataDirectories.cpp

@@ -0,0 +1,54 @@
+#include "DataDirectories.h"
+
+#include <Shlobj.h>
+
+// static member
+std::string DataDirectories::_personal;
+std::string DataDirectories::_profile;
+
+std::string unicode_to_mb(const WCHAR* utfStr)
+{
+    int utfLength = lstrlenW(utfStr);
+    int mbLength = WideCharToMultiByte(CP_UTF8, 0, utfStr, utfLength, NULL, 0, NULL, NULL);
+    std::string mbStr(mbLength, 0);
+    WideCharToMultiByte(CP_UTF8, 0, utfStr, utfLength, &mbStr[0], mbLength, NULL, NULL);
+    return mbStr;
+}
+
+std::string known_folder_path(const KNOWNFOLDERID& id)
+{
+    std::string path;
+    WCHAR* buffer;
+    HRESULT result = SHGetKnownFolderPath(id, 0, NULL, &buffer);
+    if (result == S_OK) {
+        path = unicode_to_mb(buffer);
+        CoTaskMemFree(buffer);
+    }
+    return path;
+}
+
+const std::string& DataDirectories::personal()
+{
+    if (_personal.empty())
+        _personal = known_folder_path(FOLDERID_Documents);
+    return _personal;
+}
+
+const std::string& DataDirectories::personal(const std::string& path)
+{
+    _personal = path;
+    return _personal;
+}
+
+const std::string& DataDirectories::profile()
+{
+    if (_profile.empty())
+        _profile = known_folder_path(FOLDERID_LocalAppData) + "\\Barrier";
+    return _profile;
+}
+
+const std::string& DataDirectories::profile(const std::string& path)
+{
+    _profile = path;
+    return _profile;
+}