关于文件操作API方法以前用过,这次用了下MFC封装好的CFILE类实现文件的传输,这对大的双机文件传输来说还是蛮方便的。这种方法可以传输文本文件和二进制文件都可以.
CSOCKT建立连接比较容易,如下
CSocket sockClient;
void CFileTrans::MakeConnection(string address,int port)
{
AfxSocketInit(NULL);
sockClient.Create();
sockClient.Connect(address.c_str(), port);
}
发送端获取待传输文件的大小,发送到接收端,接收端根据发送的大小申请空间,准备接受文件,这里一定要注意申请的内存空间的大小不能太大,因为内存正常情况下可以申请的内存大小最好不要大于1G,所以这里每次限制申请空间的大小最大为1k,分情况来传输接收。
接受端:(sockClient需要先建立连接)
void CFileTrans::RecvFile(string fileName)
{
int myFileLength;
sockClient.Receive(&myFileLength, sizeof(myFileLength));
CFile destFile(fileName.c_str(),CFile::modeCreate | CFile::modeWrite);
if (myFileLength<1024)
{
byte* data = new byte[myFileLength];
if (data==NULL)
{
AfxMessageBox("文件长度小于1024内存不足");
exit(0);
}
sockClient.Receive(data, myFileLength); //Get the whole thing
destFile.Write(data, myFileLength); // Write it
delete []data;
}
else
{
for (int i=0; i {
byte* data = new byte[1024];
if (data==NULL)
{
AfxMessageBox("文件长度大于1024,整数中内存不足");
exit(0);
}
sockClient.Receive(data, 1024); //Get the whole thing
destFile.Write(data, 1024); // Write it
delete [] data;
}
if (myFileLength%1024!=0)
{
int len=myFileLength-i*1024;
byte* data=new byte[len];
if (data==NULL)
{
AfxMessageBox("文件大小大于1024,之外内存不足");
exit(0);
}
sockClient.Receive(data, len); //Get the whole thing
destFile.Write(data, len); // Write it
delete []data;
}
}
destFile.Close();
}
发送端:
CFile myFile;
myFile.Open(fileName.c_str(), CFile::modeRead);
int myFileLength = myFile.GetLength(); // Going to send the correct File Size
sockClient.Send(&myFileLength, sizeof(myFileLength)); // 4 bytes long
byte* data;
if (myFileLength<1024)
{
data = new byte[myFileLength];
if (data==NULL)
{
AfxMessageBox("内存不足");
exit(0);
}
myFile.Read(data, myFileLength);
sockClient.Send(data, myFileLength); //Send the whole thing now
delete []data;
}
else
{
for (int i=0; i {
data = new byte[1024];
if (data==NULL)
{
AfxMessageBox("内存不足");
exit(0);
}
myFile.Read(data, 1024);
sockClient.Send(data, 1024); //Send the whole thing now
delete []data;
}
if (myFileLength/1024!=0)
{
int len=myFileLength-i*1024;
data=new byte[len];
if (data==NULL)
{
AfxMessageBox("内存不足");
exit(0);
}
myFile.Read(data, len);
sockClient.Send(data, len); //Send the whole thing now
delete []data;
}
}
myFile.Close();
}
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