X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f6bcfd974ef26faf6f91a62cac09827e09463fd1..d38d271fa63aa59d8531710b4c143ecf33fbb819:/src/msw/utilsexc.cpp

diff --git a/src/msw/utilsexc.cpp b/src/msw/utilsexc.cpp
index e6287d9f28..0f9349287b 100644
--- a/src/msw/utilsexc.cpp
+++ b/src/msw/utilsexc.cpp
@@ -315,11 +315,55 @@ LRESULT APIENTRY _EXPORT wxExecuteWindowCbk(HWND hWnd, UINT message,
 }
 #endif // Win32
 
+#if wxUSE_IPC
+
+// connect to the given server via DDE and ask it to execute the command
+static bool wxExecuteDDE(const wxString& ddeServer,
+                         const wxString& ddeTopic,
+                         const wxString& ddeCommand)
+{
+    bool ok;
+
+    wxDDEClient client;
+    wxConnectionBase *conn = client.MakeConnection(_T(""),
+                                                   ddeServer,
+                                                   ddeTopic);
+    if ( !conn )
+    {
+        ok = FALSE;
+    }
+    else // connected to DDE server
+    {
+        // the added complication here is that although most
+        // programs use XTYP_EXECUTE for their DDE API, some
+        // important ones - like IE and other MS stuff - use
+        // XTYP_REQUEST!
+        //
+        // so we try it first and then the other one if it
+        // failed
+        {
+            wxLogNull noErrors;
+            ok = conn->Request(ddeCommand) != NULL;
+        }
+
+        if ( !ok )
+        {
+            // now try execute - but show the errors
+            ok = conn->Execute(ddeCommand);
+        }
+    }
+
+    return ok;
+}
+
+#endif // wxUSE_IPC
+
 long wxExecute(const wxString& cmd, bool sync, wxProcess *handler)
 {
     wxCHECK_MSG( !!cmd, 0, wxT("empty command in wxExecute") );
 
     wxString command;
+
 #if wxUSE_IPC
     // DDE hack: this is really not pretty, but we need to allow this for
     // transparent handling of DDE servers in wxMimeTypesManager. Usually it
@@ -327,12 +371,17 @@ long wxExecute(const wxString& cmd, bool sync, wxProcess *handler)
     // given type. Sometimes, however, this command just launches the server
     // and an additional DDE request must be made to really open the file. To
     // keep all this well hidden from the application, we allow a special form
-    // of command: WX_DDE:<command>:DDE_SERVER:DDE_TOPIC:DDE_COMMAND in which
+    // of command: WX_DDE#<command>#DDE_SERVER#DDE_TOPIC#DDE_COMMAND in which
     // case we execute just <command> and process the rest below
     wxString ddeServer, ddeTopic, ddeCommand;
     static const size_t lenDdePrefix = 7;   // strlen("WX_DDE:")
     if ( cmd.Left(lenDdePrefix) == _T("WX_DDE#") )
     {
+        // speed up the concatenations below
+        ddeServer.reserve(256);
+        ddeTopic.reserve(256);
+        ddeCommand.reserve(256);
+
         const wxChar *p = cmd.c_str() + 7;
         while ( *p && *p != _T('#') )
         {
@@ -383,6 +432,22 @@ long wxExecute(const wxString& cmd, bool sync, wxProcess *handler)
         {
             ddeCommand += *p++;
         }
+
+        // if we want to just launch the program and not wait for its
+        // termination, try to execute DDE command right now, it can succeed if
+        // the process is already running - but as it fails if it's not
+        // running, suppress any errors it might generate
+        if ( !sync )
+        {
+            wxLogNull noErrors;
+            if ( wxExecuteDDE(ddeServer, ddeTopic, ddeCommand) )
+            {
+                // a dummy PID - this is a hack, of course, but it's well worth
+                // it as we don't open a new server each time we're called
+                // which would be quite bad
+                return -1;
+            }
+        }
     }
     else
 #endif // wxUSE_IPC
@@ -398,9 +463,9 @@ long wxExecute(const wxString& cmd, bool sync, wxProcess *handler)
 #if wxUSE_STREAMS
     // the first elements are reading ends, the second are the writing ones
     HANDLE hpipeStdin[2],
-           hpipeStdinWrite = INVALID_HANDLE_VALUE,
            hpipeStdout[2],
            hpipeStderr[2];
+    HANDLE hpipeStdinWrite = INVALID_HANDLE_VALUE;
 
     // open the pipes to which child process IO will be redirected if needed
     if ( handler && handler->IsRedirected() )
@@ -614,15 +679,33 @@ long wxExecute(const wxString& cmd, bool sync, wxProcess *handler)
 #if wxUSE_IPC
     // second part of DDE hack: now establish the DDE conversation with the
     // just launched process
-    if ( !!ddeServer )
+    if ( !ddeServer.empty() )
     {
-        wxDDEClient client;
-        wxConnectionBase *conn = client.MakeConnection(_T(""),
-                                                       ddeServer,
-                                                       ddeTopic);
-        if ( !conn || !conn->Execute(ddeCommand) )
+        bool ok;
+
+        // give the process the time to init itself
+        //
+        // we use a very big timeout hoping that WaitForInputIdle() will return
+        // much sooner, but not INFINITE just in case the process hangs
+        // completely - like this we will regain control sooner or later
+        switch ( ::WaitForInputIdle(pi.hProcess, 10000 /* 10 seconds */) )
         {
-            wxLogError(_("Couldn't launch DDE server '%s'."), command.c_str());
+            default:
+                wxFAIL_MSG( _T("unexpected WaitForInputIdle() return code") );
+                // fall through
+
+            case -1:
+                wxLogLastError(_T("WaitForInputIdle() in wxExecute"));
+
+            case WAIT_TIMEOUT:
+                wxLogDebug(_T("Timeout too small in WaitForInputIdle"));
+
+                ok = FALSE;
+                break;
+
+            case 0:
+                // ok, process ready to accept DDE requests
+                ok = wxExecuteDDE(ddeServer, ddeTopic, ddeCommand);
         }
     }
 #endif // wxUSE_IPC