add unitwindowobject.pas with bewares permission

[lcore.git] / lmessages.pas

diff --git a/lmessages.pas b/lmessages.pas
index 0dc159b4c8841a9de5b27d80e9c0dd48401d7233..e17ccfe933b99e52adb663cc84b269efe28236ea 100755 (executable)
--- a/lmessages.pas
+++ b/lmessages.pas
@@ -3,12 +3,22 @@
   which is included in the package\r
   ----------------------------------------------------------------------------- }\r
 \r
+//this unit provides a rough approximation of windows messages on linux\r
+//it is usefull for multithreaded applications on linux to communicate back to\r
+//the main lcore thread\r
+//This unit is *nix only, on windows you should use the real thing\r
+\r
 unit lmessages;\r
 //windows messages like system based on lcore tasks\r
 interface\r
 \r
 uses pgtypes,sysutils,bsearchtree,strings,syncobjs;\r
 \r
+\r
+{$if (fpc_version < 2) or ((fpc_version=2) and ((fpc_release < 2) or ((fpc_release = 2) and (fpc_patch < 2)) ))}\r
+  {$error this code is only supported under fpc 2.2.2 and above due to bugs in the eventobject code in older versions}\r
+{$endif}\r
+\r
 type\r
   lparam=taddrint;\r
   wparam=taddrint;\r
@@ -399,11 +409,15 @@ begin
       //we have to get the window procedure while the structurelock\r
       //is still held as the window could be destroyed from another thread\r
       //otherwise.\r
-      windowproc := window.windowproc;\r
+      if window <> nil then begin\r
+        windowproc := window.windowproc;\r
+      end else begin\r
+        windowproc := nil;\r
+      end;\r
     finally\r
       structurelock.release;\r
     end;\r
-    if window <> nil then begin\r
+    if assigned(windowproc) then begin\r
       result := windowproc(lpmsg.hwnd,lpmsg.message,lpmsg.wparam,lpmsg.lparam);\r
     end else begin\r
       result := -1;\r
@@ -480,7 +494,7 @@ end;
 \r
 function PeekMessage(var lpMsg: TMsg; hWnd: HWND; wMsgFilterMin, wMsgFilterMax, wRemoveMsg: UINT): WINBOOL;\r
 begin\r
-  result := getmessageinternal(lpmsg,hwnd,wmsgfiltermin,wmsgfiltermax,PM_REMOVE,true);\r
+  result := getmessageinternal(lpmsg,hwnd,wmsgfiltermin,wmsgfiltermax,wRemoveMsg,true);\r
 end;\r
 \r
 function SetEvent(hEvent:THevent):WINBOOL;\r