improved hook dll retry, fails silently now since there's not much the user can do, and we're not planning to change the dll significantly any time soon so it won't matter if it isn't replaced.

res/synergy.nsh

@@ -58,31 +58,26 @@ InstallDirRegKey HKEY_LOCAL_MACHINE "SOFTWARE\${product}" ""
   
   !define ID ${__LINE__}
   
-  ; some programs hang on to the hook library, wait until they're done.
+  StrCpy $R0 0 ; count
-  StrCpy $R0 0
+  StrCpy $R1 20 ; max
   retry${ID}:
   ${If} ${FileExists} "${dir}\synrgyhk.dll"
 	IntOp $R0 $R0 + 1
-	${If} $R0 < 60
+	${If} $R0 <= $R1
 	  ; wait for handle on file to be released. why so long? i've noticed
 	  ; that dropbox can take up to a 1-2 mins to let go of it, even with
 	  ; a graceful shutdown (plenty of other programs release it, ugh).
-	  Sleep 2000
+	  DetailPrint "Trying to delete synrgyhk.dll (attempt $R0 of $R1)"
-	  DetailPrint "Trying to delete synrgyhk.dll (attempt $R0)"
       Delete "${dir}\synrgyhk.dll"
+	  
+	  ${If} ${FileExists} "${dir}\synrgyhk.dll"
+		  Sleep 3000
 		  Goto retry${ID}
-	${Else}
+      ${EndIf}
-      messageBox MB_OK \
-        "The file synrgyhk.dll could not be removed, as it is being used by \
-        another program. The setup may fail when trying to install the file, \
-		but you can safely retry this when prompted. If the problem persists, \
-		please restart your computer and re-run the setup."
-	  Goto end${ID}
 	${EndIf}
   ${Else}
 	FileClose $R0
   ${EndIf}
-  end${ID}:
   
   !undef ID
   
@@ -165,7 +160,13 @@ Section "Server and Client" core
   File "${binDir}\Release\synergys.exe"
   File "${binDir}\Release\synergyc.exe"
   File "${binDir}\Release\synergyd.exe"
+  
+  ; if the hook file exists, assume we couldn't delete
+  ${If} ${FileExists} "synrgyhk.dll"
+    DetailPrint "Skipping synrgyhk.dll, file in use."
+  ${Else}
     File "${binDir}\Release\synrgyhk.dll"
+  ${EndIf}
   
   ; install and run the service
   ExecWait "$INSTDIR\synergyd.exe /install"