我想使用MySQL进程并获取它写入控制台的内容,因此我在FreePascal中编写此代码:
我想控制MySQl并阅读&写点什么。
Process := TProcess.Create(nil);
with Process do
begin
Executable := 'C:\Program Files (x86)\MySQL\MySQL Server 5.5\bin\mysql.exe';
with Parameters do
begin
Options := [poUsePipes];
Add('-u');
Add('root');
Add('-p');
end;
Execute;
sleep(1000);
WriteLn(Process.Output.NumBytesAvailable); // will be 0 but it write "Enter password"
WriteLn(Process.Stderr.NumBytesAvailable); // will be 0 but it write "Enter password"
end;
TProcess是一个控制执行其他程序的组件,我甚至测试Delphi代码,但结果都是一样的。
但问题是这会冻结因为没有输出而是控制台窗口写:
输入密码:
如何在我的应用程序和其他所有应用程序中获取此信息?
正如我所说,我想使用MySQL可执行文件并从中读取和写入,所以我不想使用它的库或任何其他数据库组件。
修改 这是来自here的我的测试的Delphi版本,结果相同:
function GetDosOutput(CommandLine: string; Work: string = 'C:\'): string;
var
SA: TSecurityAttributes;
SI: TStartupInfo;
PI: TProcessInformation;
StdOutPipeRead, StdOutPipeWrite: THandle;
WasOK: Boolean;
Buffer: array[0..255] of AnsiChar;
BytesRead: Cardinal;
WorkDir: string;
Handle: Boolean;
begin
Result := '';
with SA do begin
nLength := SizeOf(SA);
bInheritHandle := True;
lpSecurityDescriptor := nil;
end;
CreatePipe(StdOutPipeRead, StdOutPipeWrite, @SA, 0);
try
with SI do
begin
FillChar(SI, SizeOf(SI), 0);
cb := SizeOf(SI);
dwFlags := STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES;
wShowWindow := SW_HIDE;
hStdInput := GetStdHandle(STD_INPUT_HANDLE); // don't redirect stdin
hStdOutput := StdOutPipeWrite;
hStdError := StdOutPipeWrite;
end;
WorkDir := Work;
Handle := CreateProcess(nil, PChar('cmd.exe /C ' + CommandLine),
nil, nil, True, 0, nil,
PChar(WorkDir), SI, PI);
CloseHandle(StdOutPipeWrite);
if Handle then
try
repeat
WasOK := ReadFile(StdOutPipeRead, Buffer, 255, BytesRead, nil);
if BytesRead > 0 then
begin
Buffer[BytesRead] := #0;
Result := Result + Buffer;
end;
until not WasOK or (BytesRead = 0);
WaitForSingleObject(PI.hProcess, INFINITE);
finally
CloseHandle(PI.hThread);
CloseHandle(PI.hProcess);
end;
finally
CloseHandle(StdOutPipeRead);
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
memo1.text:=GetDosOutput('"C:\Program Files (x86)\MySQL\MySQL Server 5.5\bin\mysql.exe" -u root -p');
end;
它会在 WasOK 行中冻结。 此外,我测试了许多其他代码,但没有工作。