Add support for user callbacks

src/samples/test-sample/test.cpp

@@ -509,6 +509,26 @@ namespace
         return true;
     }
 
+    bool validate_primary_monitor(MONITORINFOEXA& mi)
+    {
+        if (std::string_view(mi.szDevice) != R"(\\.\DISPLAY1)")
+        {
+            return false;
+        }
+
+        if (mi.rcMonitor.left != 0 || mi.rcMonitor.top != 0 || mi.rcMonitor.right != 1920 || mi.rcMonitor.bottom != 1080)
+        {
+            return false;
+        }
+
+        if (!(mi.dwFlags & MONITORINFOF_PRIMARY))
+        {
+            return false;
+        }
+
+        return true;
+    }
+
     bool test_monitor_info()
     {
         const POINT pt = {0, 0};
@@ -526,22 +546,35 @@ namespace
             return false;
         }
 
-        if (std::string_view(mi.szDevice) != R"(\\.\DISPLAY1)")
+        return validate_primary_monitor(mi);
+    }
+
+    BOOL CALLBACK monitor_enum_proc(HMONITOR hMonitor, HDC, LPRECT, LPARAM dwData)
+    {
+        auto* valid = reinterpret_cast<bool*>(dwData);
+
+        MONITORINFOEXA mi;
+        mi.cbSize = sizeof(mi);
+
+        if (!GetMonitorInfoA(hMonitor, &mi))
+        {
+            return FALSE;
+        }
+
+        *valid = validate_primary_monitor(mi);
+
+        return *valid ? TRUE : FALSE;
+    }
+
+    bool test_user_callback()
+    {
+        bool valid = false;
+        if (!EnumDisplayMonitors(nullptr, nullptr, monitor_enum_proc, reinterpret_cast<LPARAM>(&valid)))
         {
             return false;
         }
 
-        if (mi.rcMonitor.left != 0 || mi.rcMonitor.top != 0 || mi.rcMonitor.right != 1920 || mi.rcMonitor.bottom != 1080)
-        {
-            return false;
-        }
-
-        if (!(mi.dwFlags & MONITORINFOF_PRIMARY))
-        {
-            return false;
-        }
-
-        return true;
+        return valid;
     }
 
     bool test_time_zone()
@@ -957,9 +990,9 @@ int main(const int argc, const char* argv[])
         RUN_TEST(test_interrupts, "Interrupts")
     }
     RUN_TEST(test_tls, "TLS")
-
     RUN_TEST(test_socket, "Socket")
     RUN_TEST(test_apc, "APC")
+    RUN_TEST(test_user_callback, "User Callback")
 
     return valid ? 0 : 1;
 }