From f36d0a2ea99f4c7d07e6f945996a32881adc3b98 Mon Sep 17 00:00:00 2001
From: pagefault <>
Date: Tue, 19 Jun 2001 00:56:57 +0000
Subject: [PATCH] Updated dynamic library loading

---
 zsnes/src/win/winlink.cpp | 87 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 81 insertions(+), 6 deletions(-)

diff --git a/zsnes/src/win/winlink.cpp b/zsnes/src/win/winlink.cpp
index 97507edc..37c5375d 100644
--- a/zsnes/src/win/winlink.cpp
+++ b/zsnes/src/win/winlink.cpp
@@ -129,17 +129,92 @@ extern "C" {
 DWORD                   MouseButton;
 }
 
-extern "C" {
-extern HMODULE hM_dinput8, hM_ddraw, hM_dsound;
+static char dinput8_dll[] = {"dinput8.dll\0"};
+static char dinput8_imp[] = {"DirectInput8Create\0"};
+
+static char ddraw_dll[] = {"ddraw.dll\0"};
+static char ddraw_imp[] = {"DirectDrawCreateEx\0"};
+
+static char dsound_dll[] = {"dsound.dll\0"};
+static char dsound_imp[] = {"DirectSoundCreate8\0"};
+
+static HMODULE hM_ddraw = NULL, hM_dsound = NULL,hM_dinput8 = NULL;
 
 typedef HRESULT (WINAPI* lpDirectInput8Create)(HINSTANCE hinst, DWORD dwVersion, REFIID riidltf, LPVOID *ppvOut, LPUNKNOWN punkOuter);
-extern lpDirectInput8Create pDirectInput8Create;
+static lpDirectInput8Create pDirectInput8Create;
 
-typedef HRESULT (WINAPI* lpDirectDrawCreateEx)(GUID FAR * lpGuid, LPVOID  *lplpDD, REFIID  iid,IUnknown FAR *pUnkOuter);
-extern lpDirectDrawCreateEx pDirectDrawCreateEx;
+typedef HRESULT (WINAPI* lpDirectDrawCreateEx)( GUID FAR * lpGuid, LPVOID  *lplpDD, REFIID  iid,IUnknown FAR *pUnkOuter );
+static lpDirectDrawCreateEx pDirectDrawCreateEx;
 
 typedef HRESULT (WINAPI* lpDirectSoundCreate8)(LPCGUID pcGuidDevice, LPDIRECTSOUND8 *ppDS8, LPUNKNOWN pUnkOuter);
-extern lpDirectSoundCreate8 pDirectSoundCreate8;
+static lpDirectSoundCreate8 pDirectSoundCreate8;
+
+extern "C" void ImportDirectX(void)
+{
+   hM_dinput8 = LoadLibrary(dinput8_dll);
+
+   if (hM_dinput8 == NULL)
+   {
+      if (MessageBox(NULL, "Sorry, you need DirectX v8.0 or higher to use\nZSNESW. Would you like to go to the DirectX homepage?", "Error", MB_ICONINFORMATION | MB_YESNO) == IDYES)
+         ShellExecute(NULL, NULL, "http://www.microsoft.com/directx/", NULL, NULL, 0);
+      goto startup_error_exit;
+   }
+
+   pDirectInput8Create = (lpDirectInput8Create) GetProcAddress(hM_dinput8, dinput8_imp);
+
+   if (pDirectInput8Create == NULL)
+   {
+      char err[256];
+      wsprintf(err,"Failed to import %s:%s", dinput8_dll, dinput8_imp);
+      MessageBox(NULL, err, "Error", MB_ICONERROR);
+      goto startup_dinput8_error;
+   }
+
+   hM_ddraw = LoadLibrary(ddraw_dll);
+
+   if (hM_ddraw == NULL)
+   {
+      char err[256];
+      wsprintf(err,"Failed to import %s",ddraw_dll);
+      MessageBox(NULL, err,"Error",MB_ICONERROR);
+      goto startup_dinput8_error;
+   }
+
+   pDirectDrawCreateEx = (lpDirectDrawCreateEx) GetProcAddress(hM_ddraw, ddraw_imp);
+
+   if (pDirectDrawCreateEx == NULL)
+   {
+      char err[256];
+      wsprintf(err,"Failed to import %s:%s", ddraw_dll, ddraw_imp);
+      MessageBox(NULL, err, "Error", MB_ICONERROR);
+      goto startup_ddraw_error;
+   }
+
+   hM_dsound = LoadLibrary(dsound_dll);
+
+   if (hM_dsound == NULL)
+   {
+      char err[256];
+      wsprintf(err,"Failed to import %s",dsound_dll);
+      MessageBox(NULL, err,"Error",MB_ICONERROR);
+      goto startup_ddraw_error;
+   }
+
+   pDirectSoundCreate8 = (lpDirectSoundCreate8) GetProcAddress(hM_dsound, dsound_imp);
+
+   if (pDirectSoundCreate8 == NULL)
+   {
+      char err[256];
+      wsprintf(err,"Failed to import %s:%s", dsound_dll, dsound_imp);
+      MessageBox(NULL, err, "Error", MB_ICONERROR);
+      FreeLibrary(hM_dsound);
+startup_ddraw_error:
+      FreeLibrary(hM_ddraw);
+startup_dinput8_error:
+      FreeLibrary(hM_dinput8);
+startup_error_exit:
+      exit(0);
+   }
 }
 
 #define UPDATE_TICKS_GAME 1000.855001760297741789468390082/60      // milliseconds per world update