将zip文件保存到磁盘的UWP

Question

我有一个使用HTML/Javascript编写的UWP应用程序，我在保存JSZip制作的zip文件时遇到了问题，具体来说，我卡在了将其写入磁盘的步骤上。

我在Microsoft文档中看到有WriteBufferAsync、WriteBytesAsync、WriteLinesAsync和WriteTextAsync等方法，但我不确定我需要哪个。此外，JSZip可以生成不同类型的文件，如base64、binarystring、uint8array、arraybuffer和blob，我不确定我需要哪种组合才能将这个zip文件写入用户的磁盘。

下面是我的代码:

savePNGButton.addEventListener('click', function (e) {
  var zip = new JSZip();
  if (WatermarkText === ""){
    ZipFolder = zip.folder("ImageFolder");
  } else {
    ZipFolder = zip.folder(WatermarkText);
  }
  $(".WatermarkPhoto").each(function(index) {
   imgsrc = this.src;
   var DataURL = imgsrc.replace('data:image/png;base64,', '');
   ZipFolder.file(WatermarkText + index + ".png", DataURL, { base64: true });

  });
  zip.generateAsync({ type:"blob"})
      .then(function (content) {
          console.log(content);
          var savePicker = new Windows.Storage.Pickers.FileSavePicker();
          savePicker.suggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.documentsLibrary;
          savePicker.fileTypeChoices.insert("ZIP archive", [".zip"]);
          savePicker.suggestedFileName = WatermarkText+".zip";
          savePicker.pickSaveFileAsync().then(function (file) {
              if (file) {
                  Windows.Storage.CachedFileManager.deferUpdates(file);
                  Windows.Storage.FileIO.writeTextAsync(file, content).done(function () {
                      Windows.Storage.CachedFileManager.completeUpdatesAsync(file).done(function (updateStatus) {
                          if (updateStatus === Windows.Storage.Provider.FileUpdateStatus.complete) {
                              console.log("File " + file.name + " was saved.");
                          } else {
                              console.log("File " + file.name + " couldn't be saved.");
                          }
                      });
                  });
              } else {
                  console.log("Operation cancelled.");
              }
          });
      });
});

- Ian MacLean

---

我只是不确定需要哪种组合才能将此zip文件写入用户磁盘。这个要求仅适用于使用Windows 10操作系统的计算机，对吗？ - guest271314

是的。我正在尝试将这个Windows 10应用程序放入Windows应用商店中。 - Ian MacLean

Answer 1

如果有人遇到这个问题，我找到了这个链接，它引导我朝着正确的方向https://blog.appliedis.com/2013/09/18/zipping-and-unzipping-files-in-a-winjs-application/。我使用了JSZip中的uint8array，结合文件流和Windows FileIO类中的WriteBytesAsync。以下是我用于压缩并呈现文件保存对话框的最终代码块。

savePNGButton.addEventListener('click', function (e) {
  var zip = new JSZip();
  if (WatermarkText === ""){
    ZipFolder = zip.folder("Images");
  } else {
    ZipFolder = zip.folder(WatermarkText);
  }
  $(".WatermarkPhoto").each(function(index) {
   imgsrc = this.src;
   var DataURL = imgsrc.replace('data:image/png;base64,', '');
   ZipFolder.file(WatermarkText + index + ".png", DataURL, { base64: true });

  });

  zip.generateAsync({ type: "uint8array", streamFiles:"true"})
      .then(function (content) {
          console.log(content);
              var savePicker = new Windows.Storage.Pickers.FileSavePicker();
              savePicker.suggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.documentsLibrary;
              savePicker.fileTypeChoices.insert("ZIP archive", [".zip"]);
              savePicker.suggestedFileName = WatermarkText + ".zip";
              savePicker.pickSaveFileAsync().then(function (file) {
                  if (file) {
                      Windows.Storage.CachedFileManager.deferUpdates(file);
                      Windows.Storage.FileIO.writeBytesAsync(file, content).done(function () {
                          Windows.Storage.CachedFileManager.completeUpdatesAsync(file).done(function (updateStatus) {
                              if (updateStatus === Windows.Storage.Provider.FileUpdateStatus.complete) {
                                  console.log("File " + file.name + " was saved.");
                              } else {
                                  console.log("File " + file.name + " couldn't be saved.");
                              }
                          });
                      });
                  } else {
                      console.log("Operation cancelled.");
                  }
              });
      });
});

- Ian MacLean