Monday, August 23, 2010

Copying files from the Desktop to the Device using .NET

Someone asked me recently how to copy files from the desktop to the device after reading my old article called How to copy files from the Device to the Desktop using .NET. Well here's how to do it:

First, we'll need our P/Invokes to rapi.dll

[DllImport("rapi.dll")]
static extern int CeRapiInit();
 
[DllImport("rapi.dll")]
static extern int CeRapiUninit();
 
[DllImport("rapi.dll", CharSet = CharSet.Unicode)]
static extern IntPtr CeCreateFile(
  string lpFileName,
  uint dwDesiredAccess,
  int dwShareMode,
  int lpSecurityAttributes,
  int dwCreationDisposition,
  int dwFlagsAndAttributes,
  int hTemplateFile);
 
[DllImport("rapi.dll", CharSet = CharSet.Unicode)]
internal static extern int CeWriteFile(
    IntPtr hFile,
    byte[] lpBuffer,
    int nNumberOfbytesToWrite,
    ref int lpNumberOfbytesWritten,
    int lpOverlapped);
 
[DllImport("rapi.dll", CharSet = CharSet.Unicode)]
internal static extern int CeSetFileTime(
    IntPtr hFile,
    ref long lpCreationTime,
    ref long lpLastAccessTime,
    ref long lpLastWriteTime);
 
const int BUFFER_SIZE = 1024 * 5; // 5k transfer buffer
const int CREATE_ALWAYS = 2;
const int ERROR_SUCCESS = 0;
const int FILE_ATTRIBUTE_NORMAL = 0x80;
const uint GENERIC_WRITE = 0x40000000;
const int INVALID_HANDLE_VALUE = -1;


Now let's wrap all those in a method called CopyToDevice(string localFile, string remoteFile). The localFile is the file located on the desktop and the remoteFile is the destination filename on the device.

void CopyToDevice(string localFile, string remoteFile)
{
    var rapi = CeRapiInit() == ERROR_SUCCESS;
    if (!rapi)
        return;
 
    try
    {
        var filePtr = CeCreateFile(remoteFile, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
        if (filePtr == new IntPtr(INVALID_HANDLE_VALUE))
            return;
 
        using (var localFileStream = new FileStream(localFile, FileMode.Open, FileAccess.Read))
        {
            var byteswritten = 0;
            var position = 0;
            var buffer = new byte[BUFFER_SIZE];
 
            var bytesread = localFileStream.Read(buffer, position, BUFFER_SIZE);
            while (bytesread > 0)
            {
                position += bytesread;
                if (CeWriteFile(filePtr, buffer, bytesread, ref byteswritten, 0) == ERROR_SUCCESS)
                    return;
 
                try
                {
                    bytesread = localFileStream.Read(buffer, 0, BUFFER_SIZE);
                }
                catch
                {
                    bytesread = 0;
                }
            }
        }
    }
    finally
    {
        CeRapiUninit();
    }
}


To use the code above you will have to know the full path of the file on the desktop.
I hope you found this useful.

2 comments:

Giới thiệu said...

Thanks, this article is very helpful for me.

Giới thiệu said...

Thanks, It is very helpful for me.