delphi 进程间传递数据

1.共享内存

//创建共享内存
     hMapFile := CreateFileMapping(
               INVALID_HANDLE_VALUE,    // use paging file
               nil,                    // default security
               PAGE_READWRITE,          // read/write access
               0,                       // maximum object size (high-order DWORD)
               256,                // maximum object size (low-order DWORD)
               PChar(globalCloseName));                 // name of mapping object
     if hMapFile <> 0 then begin
        pshare :=  MapViewOfFile(hMapFile,   // handle to map object
                        FILE_MAP_ALL_ACCESS, // read/write permission
                        0,
                        0,
                        256);
        if PShare = nil then begin
            closehandle(hMapFile);
            hMapFile := 0;
        end;
     end;

//释放共享内存
       CloseHandle(hMapFile);
       UnmapViewOfFile(pshare);

//引用共享内存
  hMapFile := OpenFileMapping(
                   FILE_MAP_ALL_ACCESS,   // read/write access
                   FALSE,                 // do not inherit the name
                   PChar(globalCloseName));               // name of mapping object
  if hMapFile <> 0 then begin
      PShare := MapViewOfFile(hMapFile, // handle to map object
               FILE_MAP_ALL_ACCESS,  // read/write permission
               0,
               0,
               255);
      if PShare = nil then begin
          CloseHandle(hMapFile);
          hMapFile := 0;
      end;
  end;

2.消息

//发送消息
procedure SendProgramMsg(DesForm: THandle; wIdent,lp: Word;sSendMsg:string);
var
  SendData                  : TCopyDataStruct;
  nParam                    : Integer;
begin
  nParam := MakeLong(lp, wIdent);
  SendData.cbData := Length(AnsiString(sSendMsg)) + 1;
  GetMem(SendData.lpData, SendData.cbData);
  (PAnsiChar(SendData.lpData) + SendData.cbData)^ := #0;
  Move(PAnsiChar(AnsiString(sSendMsg))^, PAnsiChar(AnsiString(SendData.lpData))^, Length(AnsiString(sSendMsg)) + 1);

  SendMessage(DesForm, WM_COPYDATA, nParam, Cardinal(@SendData));
  FreeMem(SendData.lpData);
end;

//接收消息
procedure TfMain.MyMessage(var MsgData: TWmCopyData);
var
  sRecv: AnsiString;
  sData: string;
  wIdent, wRecog: Word;
begin
  wIdent := HiWord(MsgData.From);
  wRecog := LoWord(MsgData.From);
  sRecv := AnsiString(PAnsiChar(MsgData.CopyDataStruct^.lpData));
  sData:= string(sRecv);
  case wIdent of
      
  end;
end;

标签：hMapFile,SendData,end,delphi,object,begin,进程,传递数据,AnsiString
来源： https://blog.csdn.net/seanbill/article/details/116940665