如何让 Delphi 将字符串传递到 CMD 进程的输入管道。我能够使错误管道和输出管道正常工作,不幸的是输入管道不能正常工作。我使用的代码取自在线管道教程。原始代码中存在多个错误,导致编译时出现问题。它们已被修复,但在尝试传递输入时仍然遇到问题。
这是 Form.Create 事件中的代码。我还包含了 WritePipe 和 ReadPipe 方法。 WritePipe 不起作用,ReadPipe 起作用。 Pipe 方法中的 WriteFile 和 ReadFile 都返回成功消息,但只有 ReadPipe 真正起作用。
var
DosApp: String;
DosSize: Integer;
Security : TSecurityAttributes;
start : TStartUpInfo;
byteswritten: DWord;
WriteString : ansistring;
begin
CommandText.Clear;
// get COMSPEC variable, this is the path of the command-interpreter
SetLength(Dosapp, 255);
DosSize := GetEnvironmentVariable('COMSPEC', @DosApp[1], 255);
SetLength(Dosapp, DosSize);
// create pipes
With Security do
begin
nlength := SizeOf(TSecurityAttributes) ;
binherithandle := true;
lpsecuritydescriptor := nil;
end;
CreatePipe(InputPipeRead, InputPipeWrite, @Security, 0);
CreatePipe(OutputPipeRead, OutputPipeWrite, @Security, 0);
CreatePipe(ErrorPipeRead, ErrorPipeWrite, @Security, 0);
// start command-interpreter
FillChar(Start,Sizeof(Start),#0) ;
//start.hStdInput := InputPipeRead;
start.hStdOutput := OutputPipeWrite;
start.hStdError := ErrorPipeWrite;
start.dwFlags := STARTF_USESTDHANDLES + STARTF_USESHOWWINDOW;
start.wShowWindow := SW_Show;//SW_HIDE;
start.cb := SizeOf(start) ;
if CreateProcess('', PChar(DosApp), @Security, @Security, true,
CREATE_NEW_CONSOLE or SYNCHRONIZE, // CREATE_NO_WINDOW,
nil, nil, start, ProcessInfo) then
begin
MyThread := MainUnit.monitor.Create; // start monitor thread
MyThread.Priority := tpHigher;
end;
Button1.Enabled := true;
cmdcount := 1;
end;
写管道:
procedure WritePipeOut(OutputPipe: THandle; InString: PWideChar);
// writes Instring to the pipe handle described by OutputPipe
var
count : integer;
byteswritten: DWord;
outputstring : PAnsiChar;
TextBuffer: array[1..32767] of AnsiChar;// char;
TextString: String;
begin
// most console programs require CR/LF after their input.
InString := PWideChar(InString + #13#10);
WriteFile(InputPipeWrite, InString[1], Length(InString), byteswritten, nil);
end;
读取管道:
function ReadPipeInput(InputPipe: THandle; var BytesRem: Integer): String;
{
reads console output from InputPipe. Returns the input in function
result. Returns bytes of remaining information to BytesRem
}
var
TextBuffer: array[1..32767] of AnsiChar;// char;
TextString: String;
BytesRead: Cardinal;
PipeSize: Integer;
begin
Result := '';
PipeSize := length(TextBuffer);
// check if there is something to read in pipe
PeekNamedPipe(InputPipe, nil, PipeSize, @BytesRead, @PipeSize, @BytesRem);
if bytesread > 0 then
begin
ReadFile(InputPipe, TextBuffer, pipesize, bytesread, nil);
// a requirement for Windows OS system components
OemToChar(@TextBuffer, @TextBuffer);
TextString := String(TextBuffer);
SetLength(TextString, BytesRead);
Result := TextString;
end;
end;
进一步说明;这是与 Java 调试器一起使用的,它需要分阶段输入,因此我不认为除了直接操作 JDB 的输入之外还有任何替代方法。
非常感谢任何帮助!
最佳答案
1) 您应该将 InputPipeRead 作为 hStdInput 传递到 CreateProcess
中:取消注释您的行 start.hStdInput := InputPipeRead;
2) WritePipeOut
函数有两个错误:它将 Unicode (UTF-16LE) 字符串写入管道,并跳过第一个字符(因为它写入从 InString[ 开始的内存区域) 1])。而不是 WriteFile(InputPipeWrite, InString[1], Length(InString),...
您应该编写如下内容:
var AnsiBuf: AnsiString;
...
AnsiBuf := String(InString) + #13#10;
Write(InputPipeWrite, AnsiBuf[1], Length(AnsiBuf), byteswritten, nil);
关于delphi - Delphi 中用于命令提示符的管道,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16225025/