added an optional parameter to OS symbol lookup

When looking up a symbol from a library, previously an error was
shown when the symbol did not exist. That caused confusion when the
lookup was completely optional.
This adds a new parameter to that method so that those errors can
be handled manually if needed.

1 files changed, 7 insertions, 3 deletions

diff --git a/platform/windows/os_windows.cpp b/platform/windows/os_windows.cpp
index 3413050f4a..c091c7d022 100644
--- a/platform/windows/os_windows.cpp
+++ b/platform/windows/os_windows.cpp
@@ -1569,12 +1569,16 @@ Error OS_Windows::close_dynamic_library(void *p_library_handle) {
 	return OK;
 }
 
-Error OS_Windows::get_dynamic_library_symbol_handle(void *p_library_handle, const String p_name, void *&p_symbol_handle) {
+Error OS_Windows::get_dynamic_library_symbol_handle(void *p_library_handle, const String p_name, void *&p_symbol_handle, bool p_optional) {
 	char *error;
 	p_symbol_handle = (void *)GetProcAddress((HMODULE)p_library_handle, p_name.utf8().get_data());
 	if (!p_symbol_handle) {
-		ERR_EXPLAIN("Can't resolve symbol " + p_name + ". Error: " + String::num(GetLastError()));
-		ERR_FAIL_V(ERR_CANT_RESOLVE);
+		if (!p_optional) {
+			ERR_EXPLAIN("Can't resolve symbol " + p_name + ". Error: " + String::num(GetLastError()));
+			ERR_FAIL_V(ERR_CANT_RESOLVE);
+		} else {
+			return ERR_CANT_RESOLVE;
+		}
 	}
 	return OK;
 }