我目前正尝试通过TCP在C++客户端和C＃服务器之间发送jpeg图片流。 我在C++端使用transmitFile函数，但我不知道我是否在C＃端正确处理它。 我没有得到运行时错误，但图片没有显示，所以我想我错过了一些东西。通过TCP在C++客户端/ C＃服务器之间传输文件

编辑：更新后的代码，我收到正在做一个计算器档案大小...

C++代码(客户端：发送图片)

void TCPclient::sendPicture(LPCWSTR filename, std::string filename_str)

{

HANDLE hFile = CreateFile(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);

//Send file size

send(sock, (const char*)GetSize(filename_str), sizeof(int), 0);

LogManager::log(std::to_string(GetSize(filename_str)));

//Send file

TransmitFile(sock, hFile, GetFileSize(hFile, NULL), 1024, NULL, NULL, TF_USE_KERNEL_APC | TF_WRITE_BEHIND);

CloseHandle(hFile);

}

int TCPclient::GetSize(std::string filename)

{

struct stat stat_buf;

int rc = stat(filename.c_str(), &stat_buf);

return rc == 0 ? stat_buf.st_size : -1;

}

C＃代码(服务器：接收图像和显示它)

while (true)

{

try

{

using (MemoryStream stream = new MemoryStream(ReceiveVarData(clientSock)))

{

stream.Position = 0;

Image image = Image.FromStream(stream);

if (image != null)

pictureBox1.Image = image;

}

}

catch (Exception ex)

{

Console.WriteLine(ex.ToString());

}

}

public static byte[] ReceiveVarData(Socket s)

{

Console.WriteLine("Receiving data ...");

int offset = 0;

int recv;

Console.WriteLine("Receiving data size ...");

byte[] datasize = new byte[4];

s.Receive(datasize);

int size = BitConverter.ToInt32(datasize, 0);

Console.WriteLine("Data size " + size);

byte[] data = new byte[size];

while (offset < size)

{

Console.WriteLine("Downloading " + (offset/size)*100.0 + "%");

recv = s.Receive(data, offset, 1024, SocketFlags.None);

if (recv == 0)

{

data = null;

break;

}

offset += recv;

}

return data;

}

2017-04-04

Germain

+0

您阅读文件大小，但我没有看到您发送文件大小的位置？ –