private async void OnCommandAct(IUICommand command)
{
int cmdId = (int)command.Id;
if (cmdId == 1)
{
StorageFile file = null;
StorageFolder storagefolder = KnownFolders.RemovableDevices;
int flag = 0;
foreach (var f in await storagefolder.GetFoldersAsync())
{
foreach (var SDfolder in await f.GetFoldersAsync())
{
if (SDfolder.Name == "Downloads")
{
file = await SDfolder.CreateFileAsync("screenimg.jpg", CreationCollisionOption.ReplaceExisting);
File.WriteAllBytes(file.Path, writebuffer);
await new MessageDialog("图片已保存").ShowAsync();
flag = 1;
break;
}
}
if (flag == 0)
{
file = await f.CreateFileAsync("screenimg.jpg", CreationCollisionOption.ReplaceExisting);
File.WriteAllBytes(file.Path, writebuffer);
break;
}
}
}
}
//下载文件，接收文件信息
public async static void ReceiveFile(DiskItemModel diskitem, object obj)
{
StreamSocket stream = obj as StreamSocket;
int BUFFERSZEINT;
byte[] bufferlength = new byte[sizeof(Int32)];
byte[] filebuffer;
byte[] temp = null;
byte[] recvfilebuffer = new byte[0];
DataReader reader = new DataReader(stream.InputStream);
reader.InputStreamOptions = InputStreamOptions.Partial; //异步读取
try
{
uint count = await reader.LoadAsync(sizeof(Int32)); //从流中加载一个long长度的数据
reader.ReadBytes(bufferlength); //获取所加载的long长度的数据
//await Task.Delay(1000);
//文件长度
int fileLength = BitConverter.ToInt32(bufferlength, 0);
App.totaldownload = fileLength;
Debug.WriteLine("接收到的文件大小: " + fileLength);
//文件接收剩余长度
int notRecFileLength = fileLength;
int len = fileLength / (1024 * 1024 * 1);
BUFFERSZEINT = SetBUFFERSIZE(len);
filebuffer = new byte[BUFFERSZEINT];
//在非ui线程中一定不要进行ui操作，容易发生线程冲突，从而形成Access is denied ,未捕获的异常
//await new MessageDialog("文件开始下载,请等待").ShowAsync();
//当接收文件的长度小于文件长度
while (recvfilebuffer.Length < fileLength)
{
//最后一次少于最多接满缓冲区
if (notRecFileLength < BUFFERSZEINT)
{
count = await reader.LoadAsync((uint)notRecFileLength);
App.predownload = App.alreadydownload;
App.alreadydownload += (int)count;
notRecFileLength -= (int)count;
temp = new byte[count];
}
//前几次，每次缓冲区都为最大
else
{
//filebuffer = new byte[BUFFERSZEINT];
//实际接收的流长度为count
count = await reader.LoadAsync((uint)BUFFERSZEINT);
App.predownload = App.alreadydownload;
App.alreadydownload += (int)count;
//未接收文件的长度
notRecFileLength -= (int)count;
temp = new byte[count];
}
reader.ReadBytes(temp);
//alreadydownload +=(int)count;
//fileinfo.Count = alreadydownload;
//获取所加载的数据以字节数组的形式
//将已接收的文件流存起来
recvfilebuffer = recvfilebuffer.Concat(temp).ToArray();
//下载完毕
if (recvfilebuffer.Length >= fileLength)
{
//GetFile(diskitem.FullName,fileLength,"下载成功");
App.downloadfile.RemoveAt(0);
}
}
reader.DetachStream();
byte[] writebuffer = new byte[fileLength];
writebuffer = GetSendBuffer(writebuffer, recvfilebuffer);
if (!diskitem.Name.EndsWith(".jpg") && !diskitem.Name.EndsWith(".jpeg") && !diskitem.Name.EndsWith(".png") &&
!diskitem.Name.EndsWith(".3gp") && !diskitem.Name.EndsWith(".mp4") && !diskitem.Name.EndsWith(".mp3") &&
!diskitem.Name.EndsWith(".wma") && !diskitem.Name.EndsWith(".avi") && !diskitem.Name.EndsWith(".mov") &&
!diskitem.Name.EndsWith(".amr"))
{
App.txtstring = Encoding.UTF8.GetString(writebuffer);
}
else
{
StorageFile file = null;
StorageFolder storagefolder = KnownFolders.RemovableDevices;
int flag = 0;
foreach (var f in await storagefolder.GetFoldersAsync())
{
foreach (var SDfolder in await f.GetFoldersAsync())
{
if (SDfolder.Name == "Downloads")
{
file = await SDfolder.CreateFileAsync(diskitem.Name, CreationCollisionOption.ReplaceExisting);
File.WriteAllBytes(file.Path, writebuffer);
//Task t = Task.Factory.StartNew( new Action(async ()=> {
// await new MessageDialog("文件下载完成").ShowAsync();
//}));
flag = 1;
break;
}
}
if (flag == 0)
{
file = await f.CreateFileAsync(diskitem.Name, CreationCollisionOption.ReplaceExisting);
File.WriteAllBytes(file.Path, writebuffer);
break;
}
//在download文件夹中保存成功，下载下一个文件。
else if (flag == 1)
{
//待下载队列不为空，下载
if (App.downloadfile.Count > 0)
{
DownloadNextFile();
}
break;
}
}
}
}
catch (Exception e)
{
Debug.WriteLine(e.Message);
//await new MessageDialog(e.Message).ShowAsync();
reader.DetachStream();
App.downloadfile.RemoveAt(0);
if (App.downloadfile.Count > 0)
{
DownloadNextFile();
}
//stream.Dispose();
return;
}
}