本文主要讲的是如何使用delphi编程来记录QQ的聊天记录,下面是主要代码，供参考：

function Process_ReadRichEditText(AHandle: THandle): WideString;
var
  vGetTextEx: GETTEXTEX;
  vGetTextLengthEx: GETTEXTLENGTHEX;
  L: Integer;   vProcessId: DWORD;
  vProcess: THandle;
  vPointer: Pointer;
  vNumberOfBytesRead: Cardinal;
begin
  Result := '';
  if not IsWindow(AHandle) then Exit;
  GetWindowThreadProcessId(AHandle, @vProcessId);
  vProcess := OpenProcess(PROCESS_VM_OPERATION or PROCESS_VM_READ or
    PROCESS_VM_WRITE, False, vProcessId);
  try
    vPointer := VirtualAllocEx(vProcess, nil, 4096, MEM_RESERVE or MEM_COMMIT,
      PAGE_READWRITE);
    vGetTextLengthEx.flags := GTL_DEFAULT;
    vGetTextLengthEx.codepage := 1200; // Unicode
    WriteProcessMemory(vProcess, vPointer, @vGetTextLengthEx,
      SizeOf(vGetTextLengthEx), vNumberOfBytesRead);
    L := SendMessage(AHandle, EM_GETTEXTLENGTHEX, Integer(vPointer), 0);
    VirtualFreeEx(vProcess, vPointer, 0, MEM_RELEASE);
    if L <= 0 then Exit;
    vPointer := VirtualAllocEx(vProcess, nil, SizeOf(vGetTextEx) + L * 2 + 2,
      MEM_RESERVE or MEM_COMMIT, PAGE_READWRITE);
    SetLength(Result, L);
    vGetTextEx.cb := L * 2 + 2;
    vGetTextEx.flags := GT_DEFAULT;
    vGetTextEx.codepage := 1200; // Unicode
    vGetTextEx.lpDefaultChar := nil;
    vGetTextEx.lpUsedDefChar := nil;
    WriteProcessMemory(vProcess, vPointer, @vGetTextEx,
      SizeOf(vGetTextEx), vNumberOfBytesRead);
    SendMessage(AHandle, EM_GETTEXTEX, Integer(vPointer),
      Integer(vPointer) + SizeOf(vGetTextEx));
    ReadProcessMemory(vProcess, Pointer(Integer(vPointer) + SizeOf(vGetTextEx)),
      @Result[1], L * 2, vNumberOfBytesRead);
    VirtualFreeEx(vProcess, vPointer, 0, MEM_RELEASE);
  finally
    CloseHandle(vProcess);
  end;
end;
{ Process_ReadRichEditText }
function GetProcessName(AProcessID: THandle): string;
var
  vBuffer: array[0..MAX_PATH] of Char;
  vProcess: THandle;
begin
  vProcess := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False,
    AProcessID);
  try
    if GetModuleBaseName(vProcess, 0, vBuffer, SizeOf(vBuffer)) > 0 then
      Result := vBuffer
    else Result := '';
  finally
    CloseHandle(vProcess);
  end;
end;
{ GetProcessName }
function EnumChild(hwnd: HWND; lParam: LPARAM): BOOL; stdcall;
var
  vBuffer: array[0..255] of Char;
begin
  Result := True;
  if not IsWindowVisible(hwnd) then Exit; // 不可见
  GetClassName(hwnd, vBuffer, SizeOf(vBuffer));
  if SameText(vBuffer, 'RichEdit20A') then
  begin
    if GetWindowLong(hwnd, GWL_STYLE) and ES_READONLY <> ES_READONLY then // 非只读
    begin
      PInteger(lParam)^ := hwnd;
      Result := False;
    end;
  end;
end;

{ EnumChild }

function EnumFunc(hwnd: HWND; lParam: LPARAM): BOOL; stdcall;
var
  vBuffer: array[0..255] of Char;
  vProcessId: THandle;
begin
  Result := True;
  if not IsWindowVisible(hwnd) then Exit; // 不可见
  GetClassName(hwnd, vBuffer, SizeOf(vBuffer));
  if SameText(vBuffer, '#32770') then
  begin
    GetWindowThreadProcessId(hwnd, vProcessId);
    if SameText(GetProcessName(vProcessId), 'qq.exe') then
    begin
      GetWindowText(hwnd, vBuffer, SizeOf(vBuffer));
      if Pos('交谈中', vBuffer) > 0 then // 标题中含"聊天中"
      begin
        EnumChildWindows(hwnd, @EnumChild, lParam);
        Result := False;
      end;
    end;
  end;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
  vHandle: THandle;
begin
  vHandle := 0;
  EnumWindows(@EnumFunc, Integer(@vHandle));
  if vHandle = 0 then Exit;
  Memo1.Text := Process_ReadRichEditText(vHandle);
end;