Question

我在OSX上，我发现以下Delphi（Firemonkey）代码将控制台输出写入Memo。当我使用像“ls”这样的普通命令时，这样可以正常工作，但它不会捕获外部终端应用程序的输出。

例如，如果我运行命令行应用程序“youtube-dl”，则输出仅显示在PAServer日志中，而不显示在备忘录中。

有办法做到这一点吗？或者有人可以修改代码以使其工作吗？

const
  libc = '/usr/lib/libc.dylib';

type
  PIOFile = Pointer;

//Create a new stream connected to a pipe running the given command.
function popen(const Command: PAnsiChar; Modes: PAnsiChar): PIOFile; cdecl;
  external libc name '_popen';

//Close a stream opened by popen and return the status of its child.
function pclose(Stream: PIOFile): Integer; cdecl; external libc name '_pclose';

//Return the EOF indicator for STREAM.
function feof(Stream: PIOFile): Integer; cdecl; external libc name '_feof';

//Read chunks of generic data from STREAM.
function fread(Ptr: Pointer; Size: LongWord; N: LongWord;
  Stream: PIOFile): LongWord; cdecl; external libc name '_fread';

//Wait for a child to die.  When one does, put its status in *STAT_LOC
//and return its process ID.  For errors, return (pid_t) -1.
function wait(__stat_loc: PInteger): Integer; cdecl;
  external libc name '_wait';

procedure TForm1.ExecCmdine(const CmdLine: string);
var
  Output: PIOFile;
  Buffer: PAnsiChar;
  TempString: Ansistring;
  Line: AnsiString;
  BytesRead: Integer;
const
  BufferSize: Integer = 1000;
begin
  TempString := '';
  Output := popen(PAnsiChar(Ansistring(CmdLine)), 'r');
  GetMem(Buffer, BufferSize);
  if Assigned(Output) then
  try
    while feof(Output) = 0 do
    begin
      BytesRead := fread(Buffer, 1, BufferSize, Output);
      SetLength(TempString, Length(TempString) + BytesRead);
      Move(Buffer^, TempString[length(TempString) - (BytesRead - 1)], BytesRead);

      while Pos(#10, TempString) > 0 do
      begin
        Line := Copy(TempString, 1, Pos(#10, TempString) - 1);
          Memo1.Lines.Add(UTF8ToString(Line));

        TempString := Copy(TempString, Pos(#10, TempString) + 1, Length(TempString));
      end;
    end;
  finally
    pclose(output);
    wait(nil);
    FreeMem(Buffer, BufferSize);
  end;
end;

Answer 1

罗布·肯尼迪得到了正确的答案，但遗憾的是他并没有将其作为答案发布，所以我会这样做。

问题是youtube-dl的控制台输出被打印到stderr而不是stdout，因此我必须在运行它时向控制台命令添加2＆gt;＆amp; 1。

Answer 2

上面的代码给了我错误（Delphi 10.3.2和macOS 64位）

[dccosx64 Error] E2597 Undefined symbols for architecture x86_64:
    Error: "__pclose", referenced from:      __ZN9Functions6pcloseEPv in functions.o;
      Error: "__popen", referenced from:      __ZN9Functions5popenEPKcPc in functions.o;
      Error: "__feof", referenced from:      __ZN9Functions4feofEPv in functions.o;
      Error: "__fread", referenced from:      __ZN9Functions5freadEPvmmS0_ in functions.o;
      Error: "__wait", referenced from:      __ZN9Functions4waitEPi in functions.o;
  ld: symbol(s) not found for architecture x86_64

Delphi：捕获OSX控制台输出

2 个答案: