Prevent the CDev from running if NetDiskInit is not present.

cdev.c

@@ -32,7 +32,8 @@
 //#define optionsPopUp      6
 //#define trianglePic       7
 
-#define mountURLError 3000
+#define netDiskMissingError 3000
+#define mountURLError       3001
 
 extern void FreeAllCDevMem(void);
 
@@ -91,6 +92,17 @@ void DoHit(long ctlID, CtlRecHndl ctlHandle)
 
 long DoMachine(void)
 {
+    mountURLRec.result = NETDISK_NOT_PRESENT;
+    mountURLRec.url = "";
+
+    SendRequest(MountURL, sendToName|stopAfterOne, (Long)NETDISK_REQUEST_NAME,
+                (Long)&mountURLRec, NULL);
+
+    if (mountURLRec.result == NETDISK_NOT_PRESENT) {
+        AlertWindow(awResource+awButtonLayout, NULL, netDiskMissingError);
+        return 0;
+    }
+
     return 1;
 }
 

cdev.rez

@@ -260,7 +260,15 @@ resource rTextForLETextBox2 (helpWindow+helpTxt) {
  * Error messages
  */
 
-#define mountURLError 3000
+#define netDiskMissingError 3000
+#define mountURLError       3001
+
+resource rAlertString (netDiskMissingError) {
+    "62/"
+    "To use this control panel, you must have NetDiskInit installed "
+    "in the System:System.Setup folder on the boot disk."
+    "/^#0\$00"
+};
 
 resource rAlertString (mountURLError) {
     "32:"