如何在不回叫的情况下同步使用fs.createReadStream

如何解决如何在不回叫的情况下同步使用fs.createReadStream

我打算从zip复制文件内容，并将二进制内容放在另一个文件中。当我需要包装时会用到。

示例：-

      func_name(CURRENT_DIR);
      const MainController = require('./src/controllers/mainController');
      // This mainController file will require the binary file which is create the func_name function
      controller = new MainController(
        context,db2ConnectOutputChannel,undefined /*vscodeWrapper*/
      );
      context.subscriptions.push(controller);
      controller.activate();

func_name定义

        var odbcBindingsNode;
        var ODBC_BINDINGS = path.resolve(CURRENT_DIR,'node_modules\/ibm_db\/build\/Release\/odbc_bindings.node');
        odbcBindingsNode = 'build\/Release\/odbc_bindings_e' + electron_version + '.node';
        readStream = fs.createReadStream(BUILD_FILE);
        readStream.pipe(unzipper.Parse())
            .on('entry',function (entry) {
                if(entry.path === odbcBindingsNode) {
                    entry.pipe(fstream.Writer(ODBC_BINDINGS));
                } else {
                    entry.autodrain();
                }
            })
            .on('error',function(e) {
                console.log('Installation Failed! \n',e);
            })
            .on('finish',function() {
              console.log("\n" + 
              "===================================\n"+
              "installed successfully!\n"+
              "===================================\n");
              })

问题是第一个功能要等到第二个功能完成才可以。它移至下一行，并尝试需要maincontroller文件，该文件需要此.node文件并返回.node。 但是.node是在调用require之后创建的。有没有办法使其同步？

我尝试了回调，该返回的条件不能在回调中使用。

回拨代码：-

function akhil(CURRENT_DIR){
          var BUILD_FILE = path.resolve(CURRENT_DIR,'folder\/build.zip');
          var odbcBindingsNode;
          var ODBC_BINDINGS = path.resolve(CURRENT_DIR,'folder\/build\/Release\/odbc_bindings.node');
          odbcBindingsNode = 'build\/Release\/odbc_bindings_e' + electron_version + '.node'
          readStream = fs.createReadStream(BUILD_FILE);
          /*
            * unzipper will parse the build.zip file content and
            * then it will check for the odbcBindingsNode
            * (node Binary),when it gets that binary file,* fstream.Writer will write the same node binary
            * but the name will be odbc_bindings.node,and the other
            * binary files and build.zip will be discarded.
            */
            readStream.pipe(unzipper.Parse())
              .on('entry',function (entry) {
                  if(entry.path === odbcBindingsNode) {
                      entry.pipe(fstream.Writer(ODBC_BINDINGS));
                  } else {
                      entry.autodrain();
                  }
              })
              .on('error',function(e) {
                  console.log('Installation Failed! \n',e);
              })
              .on('finish',function() {
                console.log("\n" + 
                "===================================\n"+
                "installed successfully!\n"+
                "===================================\n");
                console.log("This is rebuild");
                const MainController = require('./src/controllers/mainController');
                controller = new MainController(
                  context,undefined /*vscodeWrapper*/
                );
                context.subscriptions.push(controller);
                controller.activate();
                })
            return 1;
    }

解决方法

使用ADM-zip软件包，我能够解决此问题。