From e39f48742b702400424db46f3b28e8a09459ca38 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lukas=20D=C3=BCrrenberger?= <eXpl0it3r@my-gate.net>
Date: Sat, 25 May 2024 00:37:41 +0200
Subject: [PATCH] Retrieve Windows error message on clipboard failures

---
 src/SFML/Window/Win32/ClipboardImpl.cpp | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/src/SFML/Window/Win32/ClipboardImpl.cpp b/src/SFML/Window/Win32/ClipboardImpl.cpp
index 342bb2d38..8c594bb10 100644
--- a/src/SFML/Window/Win32/ClipboardImpl.cpp
+++ b/src/SFML/Window/Win32/ClipboardImpl.cpp
@@ -31,6 +31,21 @@
 #include <iostream>
 #include <windows.h>
 
+namespace
+{
+    std::string getErrorString(DWORD error)
+    {
+        PTCHAR buffer;
+
+        if (FormatMessage(FORMAT_MESSAGE_MAX_WIDTH_MASK | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, reinterpret_cast<PTCHAR>(&buffer), 0, NULL) == 0)
+            return "Unknown error.";
+
+        sf::String message = buffer;
+        LocalFree(buffer);
+        return message.toAnsiString();
+    }
+}
+
 
 namespace sf
 {
@@ -43,13 +58,13 @@ String ClipboardImpl::getString()
 
     if (!IsClipboardFormatAvailable(CF_UNICODETEXT))
     {
-        err() << "Failed to get the clipboard data in Unicode format." << std::endl;
+        err() << "Failed to get the clipboard data in Unicode format: " << getErrorString(GetLastError()) << std::endl;
         return text;
     }
 
     if (!OpenClipboard(NULL))
     {
-        err() << "Failed to open the Win32 clipboard." << std::endl;
+        err() << "Failed to open the Win32 clipboard: " << getErrorString(GetLastError()) << std::endl;
         return text;
     }
 
@@ -57,7 +72,7 @@ String ClipboardImpl::getString()
 
     if (!clipboard_handle)
     {
-        err() << "Failed to get Win32 handle for clipboard content." << std::endl;
+        err() << "Failed to get Win32 handle for clipboard content: " << getErrorString(GetLastError()) << std::endl;
         CloseClipboard();
         return text;
     }
@@ -75,13 +90,13 @@ void ClipboardImpl::setString(const String& text)
 {
     if (!OpenClipboard(NULL))
     {
-        err() << "Failed to open the Win32 clipboard." << std::endl;
+        err() << "Failed to open the Win32 clipboard: " << getErrorString(GetLastError()) << std::endl;
         return;
     }
 
     if (!EmptyClipboard())
     {
-        err() << "Failed to empty the Win32 clipboard." << std::endl;
+        err() << "Failed to empty the Win32 clipboard: " << getErrorString(GetLastError()) << std::endl;
         CloseClipboard();
         return;
     }