我想访问另一个进程控制台的缓冲区(通过 AttachConsole),以调用 ReadConsoleOutput 等。
是一个 DOS 16 位应用程序。我不能使用管道,因为它不会连续写入输出(它模拟“windows”......如果你知道我的意思的话,就像 FAR 指挥官一样)。
所以我应该:
1) 启动应用程序 2) 获取进程 ID 3) 调用 AttachConsole(ProcId) 4) 调用 GetConsoleScreenBufferInfo 以获取大小 5) 调用 ReadConsoleOutput
问题出在 3:当我调用 AttachConsole 时,ir 返回 0,在调用 GetLastError 后它报告 ERROR_INVALID_PARAMETER 87 (0x57)。
AttachConsole 的唯一参数是 ProcessId,我用 ProcessExplorer 检查了它是正确的(它实际上是模拟应用程序的 ntvdm.exe 的 PID)。
德尔福代码:
function AttachConsole(dwProcessId: DWORD): Cardinal; external kernel32 name 'AttachConsole';
var
Handle: HWND;
function EnumWindowsProc(hwnd: HWND; lParam: LPARAM): BOOL; stdcall;
var
s: string;
IsVisible, IsOwned, IsAppWindow: Boolean;
begin
Result := True;//carry on enumerating
IsVisible := IsWindowVisible(hwnd);
if not IsVisible then
exit;
IsOwned := GetWindow(hwnd, GW_OWNER)<>0;
if IsOwned then
exit;
IsAppWindow := GetWindowLongPtr(hwnd, GWL_STYLE) and WS_EX_APPWINDOW<>0;
if not IsAppWindow then
exit;
SetLength(s, GetWindowTextLength(hwnd));
GetWindowText(hwnd, PChar(s), Length(s)+1);
if AnsiContainsText(s, '????.EXE') then // set windows name to search
Handle := hwnd;
end;
procedure Test(Strings: TStrings);
var
ProcessID: Cardinal;
begin
Handle := 0;
EnumWindows(@EnumWindowsProc, 0);
Strings.Add('Handle: ' + IntToStr(Handle));
if Handle <> 0 then
SetForegroundWindow(Handle);
Sleep(100);
GetWindowThreadProcessId(Handle, @ProcessID);
Strings.Add('ProcessId: ' + IntToStr(ProcessID));
if AttachConsole(ProcessId) <> 0 then
Strings.Add('Ok Attached')
else
Strings.Add('Error: ' + IntToStr(GetLastError));
end;
在表单中放置备忘录和按钮。在 OnClick 调用 Test(Memo1.Lines)。
===== 编辑完整的解决方案 =====
function AttachAndGetConsoleHandle(ProcessId: Cardinal): Cardinal;
begin
if not AttachConsole(ProcessId) then
raise Exception.Create('AttachConsole error: ' + IntToStr(GetLastError));
Result := GetStdHandle(STD_OUTPUT_HANDLE);
if Result = INVALID_HANDLE_VALUE then
raise Exception.Create('GetStdHandle(STD_OUTPUT_HANDLE) error: ' + IntToStr(GetLastError));
end;
procedure DettachConsole;
begin
if not FreeConsole then
raise Exception.Create('FreeConsole error: ' + IntToStr(GetLastError));
end;
function ReadConsole(ConsoleHandle: Cardinal): TStringList;
var
BufferInfo: _CONSOLE_SCREEN_BUFFER_INFO;
BufferSize, BufferCoord: _COORD;
ReadRegion: _SMALL_RECT;
Buffer: Array of _CHAR_INFO;
I, J: Integer;
Line: AnsiString;
begin
Result := TStringList.Create;
ZeroMemory(@BufferInfo, SizeOf(BufferInfo));
if not GetConsoleScreenBufferInfo(ConsoleHandle, BufferInfo) then
raise Exception.Create('GetConsoleScreenBufferInfo error: ' + IntToStr(GetLastError));
SetLength(Buffer, BufferInfo.dwSize.X * BufferInfo.dwSize.Y);
BufferSize.X := BufferInfo.dwSize.X;
BufferSize.Y := BufferInfo.dwSize.Y;
BufferCoord.X := 0;
BufferCoord.Y := 0;
ReadRegion.Left := 0;
ReadRegion.Top := 0;
ReadRegion.Right := BufferInfo.dwSize.X;
ReadRegion.Bottom := BufferInfo.dwSize.Y;
if ReadConsoleOutput(ConsoleHandle, Pointer(Buffer), BufferSize, BufferCoord, ReadRegion) then
begin
for I := 0 to BufferInfo.dwSize.Y - 1 do
begin
Line := '';
for J := 0 to BufferInfo.dwSize.X - 1 do
Line := Line + Buffer[I * BufferInfo.dwSize.X + J].AsciiChar;
Result.Add(Line)
end
end
else
raise Exception.Create('ReadConsoleOutput error: ' + IntToStr(GetLastError));
end;