Update

err.cpp

@@ -69,3 +69,17 @@ char* err_get_errno_message(int errnum) {
     if (!cpp2c::string2char(msg, tmp)) return nullptr;
     return tmp;
 }
+
+#if _WIN32
+bool err::get_winerror(std::string& out, int32_t errnum) {
+    LPWSTR errbuf;
+    DWORD len;
+    if (!(len = FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS, nullptr, errnum, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPWSTR)&errbuf, 0, nullptr))) {
+        if (errbuf) LocalFree(errbuf);
+        return false;
+    }
+    bool re = wchar_util::wstr_to_str(out, std::wstring(errbuf, len), CP_UTF8);
+    LocalFree(errbuf);
+    return re;
+}
+#endif

err.h

@@ -1,6 +1,9 @@
 #ifndef _UTILS_ERR_H
 #define _UTILS_ERR_H
 #if __cplusplus
+extern "C" {
+#include <stdint.h>
+}
 #include <string>
 
 namespace err {
@@ -11,6 +14,15 @@ namespace err {
      * @returns true if successed
     */
     bool get_errno_message(std::string &out, int errnum);
+#if _WIN32
+    /**
+     * @brief Get error message for HRESULT
+     * @param out Output string
+     * @param errnum HRESULT
+     * @return true if successed
+    */
+    bool get_winerror(std::string &out, int32_t errnum);
+#endif
 }
 extern "C" {
 #endif