Hi,
TAsyncProcess from the LCL has a property NumBytesAvailable. Attached patch adds it
to TProcess in the FCL.
NumBytesAvailable checks how many bytes are available in TProcess.Output, so you can
decide not to read from it if there are no bytes available.
Maybe you want a different name for the property or different implementation
details. If so, let it know, so I can adapt the patch.
Vincent
Index: inc/process.pp
===================================================================
--- inc/process.pp (revision 6181)
+++ inc/process.pp (working copy)
@@ -41,6 +41,9 @@
Type
+
+ { TProcess }
+
TProcess = Class (TComponent)
Private
FProcessOptions : TProcessOptions;
@@ -69,6 +72,7 @@
dwy : Cardinal;
Procedure FreeStreams;
Function GetExitStatus : Integer;
+ function GetNumBytesAvailable: dword;
Function GetRunning : Boolean;
Function GetWindowRect : TRect;
Procedure SetWindowRect (Value : TRect);
@@ -113,6 +117,7 @@
Property Stderr : TinputPipeStream Read FStderrStream;
Property ExitStatus : Integer Read GetExitStatus;
Property InheritHandles : Boolean Read FInheritHandles Write
FInheritHandles;
+ Property NumBytesAvailable: dword read GetNumBytesAvailable;
Published
Property Active : Boolean Read GetRunning Write SetActive;
Property ApplicationName : String Read FApplicationName Write
SetApplicationName;
Index: unix/process.inc
===================================================================
--- unix/process.inc (revision 6181)
+++ unix/process.inc (working copy)
@@ -4,7 +4,9 @@
uses
Unix,
- Baseunix;
+ Baseunix
+ {$IFDEF linux},TermIO{$ENDIF}
+ ;
resourcestring
SErrNoSuchProgram = 'Executable not found: "%s"';
@@ -240,6 +242,23 @@
end;
end;
+{$ifdef BSD}
+const
+ FIONREAD = $4004667F;
+{$endif}
+
+function TProcess.GetNumBytesAvailable: dword;
+begin
+ if not (poUsePipes in Options) then
+ Result := 0
+ else begin
+ // FIONREAD -> bytes available for reading without blocking
+ if fpioctl(Output.Handle, FIONREAD, @Result)<0 then
+ Result := 0;
+ end;
+end;
+
+
Procedure TProcess.Execute;
Var
Index: win/process.inc
===================================================================
--- win/process.inc (revision 6181)
+++ win/process.inc (working copy)
@@ -149,6 +149,17 @@
end;
+Function TProcess.GetNumBytesAvailable: DWORD;
+
+begin
+ if not (poUsePipes in Options) then
+ Result := 0
+ else
+ if not PeekNamedPipe(Output.Handle, nil, 0, nil, @Result, nil) then
+ Result := 0;
+end;
+
+
Procedure TProcess.Execute;
Index: wince/process.inc
===================================================================
--- wince/process.inc (revision 6181)
+++ wince/process.inc (working copy)
@@ -149,6 +149,14 @@
end;
+Function TProcess.GetNumBytesAvailable: DWORD;
+
+begin
+ // Windows CE doesn´t have the API function PeekNamedPipe
+ Result := 0;
+end;
+
+
Procedure TProcess.Execute;
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