Adding debug messages while loading DLLs.

1 files changed, 23 insertions, 2 deletions

diff --git a/src/lua-plugin.cc b/src/lua-plugin.cc
index bf5fc29..8ff67ee 100644
--- a/src/lua-plugin.cc
+++ b/src/lua-plugin.cc
@@ -15,14 +15,35 @@ typedef void(*init_ptr_t)(Lua *);
 #include <windows.h>
 #include "MemoryModule.h"
 
+static void showError() {
+    DWORD dwErrCode = GetLastError();
+    LPVOID lpMsgBuf;
+    if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
+                      FORMAT_MESSAGE_FROM_SYSTEM |
+                      FORMAT_MESSAGE_IGNORE_INSERTS,
+                      NULL, GetLastError(),
+                      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
+                      (LPTSTR) &lpMsgBuf, 0, NULL )) {
+        Base::printm(M_INFO, "Error: %s\n", lpMsgBuf);
+        LocalFree(lpMsgBuf);
+    }
+}
+
+static HMODULE LoadLibraryExWrap(LPCTSTR lpFileName, HANDLE hFile, DWORD dwFlags) {
+    HMODULE r = LoadLibraryEx(lpFileName, hFile, dwFlags);
+    if (!r)
+        showError();
+    return r;
+}
+
 void LuaLoadPlugin(const String & _fname, const String & searchpath, Lua * L) throw (GeneralException) {
     HMODULE handle;
     String fname = _fname + "." SHARED_EXT;
 
     Base::printm(M_INFO, "Loading library " + fname + "\n");
 
-    if (!(handle = LoadLibraryEx(fname.to_charp(), NULL, LOAD_WITH_ALTERED_SEARCH_PATH)) &&
-        !(handle = LoadLibraryEx(fname.to_charp(), NULL, NULL))) {
+    if (!(handle = LoadLibraryExWrap(fname.to_charp(), NULL, LOAD_WITH_ALTERED_SEARCH_PATH)) &&
+        !(handle = LoadLibraryExWrap(fname.to_charp(), NULL, NULL))) {
         LuaLoadPlugin(&Input(fname), L);
         return;
     }