Comments by rmds - CodeProject

rmds 1-Feb-19 5:47am View

Here's the snippet:

SERVER SIDE:

command_header.command = SEND_FILE;
command_header.iDataBuffer = findfile.cFileName;
int nfRet = SockConnection.Send((char*)&command_header.command,
sizeof(command_header.command));
size_t iDataLen = command_header.iDataBuffer.GetLength() * sizeof(TCHAR);
nfRet = SockConnection.Send((char*)command_header.iDataBuffer.GetBuffer(),iDataLen);
switch(command_header.command) {
case SEND_FILE: {
CFile Sourcefile;
Sourcefile.Open(Filepath, CFile::modeRead);
ULONGLONG dwLength = Sourcefile.GetLength();
command_header.DataBuffer = new char[(int)dwLength + 1];
UINT nActual = Sourcefile.Read(command_header.DataBuffer,dwLength);
command_header.DataBuffer[nActual] = 0;
nfRet = SockConnection.Send(command_header.DataBuffer, nActual);

CLIENT SIDE:
COMMAND_HEADER hCommand_header;
CFile Destfile;
char nBuf[1000];
int nRet = SockConnection.Receive((char*)&hCommand_header.command,
sizeof(hCommand_header.command));
nRet = SockConnection.Receive((char*)hCommand_header.iDataBuffer.GetBuffer(50),
50*sizeof(TCHAR));
hCommand_header.iDataBuffer.ReleaseBuffer(nRet/sizeof(TCHAR));

here: hCommand_header.iDataBuffer still has junk that was not the case in CREATE_FILE command.

rmds 1-Feb-19 5:33am View

Could you please lemme know how you comeup with the calculation of GetBuffer() and ReleaseBuffer()? This is pure mastermind!!! and it worked for CREATE_FILE Command. But, wen I'm changing command to SEND_FILE, hCommand_header.iDataBuffer still has garbage values. thank you very much

rmds 31-Jan-19 7:44am View

I hate to trouble but been checking for quite a while now... A txtfile with the name is created, however the above code crashes with error dialog"Heap Corruption Detected: after Normal block. "CRT detected that the application wrote to memory end of heap buffer". It crashes when I press F10 after "DestFile.Open" in following code:

switch(hCommand_header.command) {
case CREATE_FILE: {
nRet = SockConnection.Receive((char*)hCommand_header.iDataBuffer.GetBuffer(),50);
(hCommand_header.iDataBuffer.GetBuffer())[nRet] = '\0';
Destfile.Open(hCommand_header.iDataBuffer, CFile::modeCreate | CFile::modeWrite);
}
hCommand_header.iDataBuffer.ReleaseBuffer();
break;

rmds 31-Jan-19 5:14am View

I got it. It worked! Thank you very much!!!

rmds 31-Jan-19 5:04am View

OK...instead this code reads the filename but along with the garbage value:
int nRet = SockConnection.Receive((char*)&hCommand_header.command,
sizeof(hCommand_header.command));

switch(hCommand_header.command) {
case CREATE_FILE: {
nRet = SockConnection.Receive((char*)hCommand_header.iDataBuffer.GetBuffer(), 50);
}
break;

how to get rid of the garbage and unpack the filename to CString?

rmds 31-Jan-19 4:42am View

Thank you, it says a lot! I tried above however, still receiving client not getting the filename. Here's my client end code:

COMMAND_HEADER hCommand_header;
CString fname[50];
int nRet = SockConnection.Receive((char*)&hCommand_header, sizeof(hCommand_header));
switch(hCommand_header.command) {
case CREATE_FILE: {
nRet = SockConnection.Receive((char*)&hCommand_header.iDataBuffer, 50); // instead I
// also tried this:
nRet = SockConnection.Receive(fname, 50);
}
break;
Thank you!

rmds 29-Jan-19 1:34am View

Actually mine is char* to struct. Tried:
method 1. memcpy(command_header.Message_Buffer, buffer, nActual);
buffer[nActual] = '\0';

method 2. memset(command_header.DataBuffer, '\0', sizeof(command_header.DataBuffer));
strcpy(command_header.DataBuffer, buffer);

Both these methods reads data along with junk values too.

rmds 28-Jan-19 23:26pm View

Agreed! Pls help me get rid of garbage values in above situation. Thank you

rmds 28-Jan-19 13:39pm View

Thanks much...Somehow this memcpy reads garbage values too at the end...Here's what I tried:
memcpy(command_header.Message_Buffer, buffer, /*min(1000, nActual)*/nActual);
buffer[nActual] = '\0';
int nRet = m_SocketConnection.Send((char*)&command_header,
sizeof(command_header));

rmds 28-Jan-19 7:04am View

command_header is an object structure Command_Data. and Yes, I'm reading the data from SourceFile into that buffer. I also changed the definition of command data to:

struct Command_Data {
char message[1000];
};

All I want is copy the buffer which contains data from file into this 'char message[1000]' in above struct.

rmds 28-Jan-19 6:08am View

Thank you, but the code posted already is pretty much all of it.
By the way I found way to type cast from char* to struct.

"Command_Data* tmp_str = reinterpret_cast<Command_Data*>(buffer);"
Now, gotta copy this data into [Command_Data message buffer]. I changed it to array.. How to do this?

rmds 28-Jan-19 5:35am View

My bad! I missed these...
COMMAND_HEADER command_header;
command_header.command = SEND_FILE;
ULONGLONG dwLength = Sourcefile.GetLength();
char* buffer = new char[(int)dwLength + 1];
buffer[dwLength] = 0;
UINT nActual = Sourcefile.Read(buffer, dwLength);
Command_Data *tmp_str = (Command_Data *)buffer;
//Buffer contains text file.
int nfRet = SockConnection.Send((char*)&command_header, sizeof(command_header));

//Command_Data *tmp_str = (Command_Data *)buffer;//trying to type cast from char* to struct.

rmds 26-Jan-19 8:37am View

The link goes to surface download page!!!

rmds 24-Jan-19 23:56pm View

Thank you rick and richard!

rmds 24-Jan-19 2:38am View

Can you please give me glimpse of header you're referring to with message, length and command. Just wanna see how it looks like to get an idea to implement. Thank you

rmds 23-Jan-19 6:52am View

After going through lot, i did this...
Server:
typedef struct{
char* filename[20];
}Data_Buffer;
Data_Buffer data_buffer;
data_buffer.filename[21] = "myinputfile";

int nRet = SockConnection.Send((void*)&data_buffer, sizeof(data_buffer));

Client:
typedef struct{
char* filename[21];
}Data_Buffer;
Data_Buffer data_buffer;
int nRet = SockConnection.Receive((void*)&data_buffer, sizeof(data_buffer));
CFile Destfile;
CString filename = (LPCTSTR)&data_buffer;
Destfile.Open(filename, CFile::modeCreate | CFile::modeWrite);
Destfile.Write(Buf, br);

I get file name as garbage values.. What went wrong?

rmds 23-Jan-19 5:37am View

I really appreciate your time for this. Could you please clarify is this what you mean by header? :
typedef struct COMMAND_HEADER {
char* SET_FILE_NAME;
int data_size;
}
please correct me if I'm wrong

rmds 23-Jan-19 0:33am View

I understand but, I never actually done it. I'm trying since yesterday but unable to find how the send() with command header looks like. Can atleast show me glimpse of send() with command header with any kind of example? Thank you very much.

rmds 22-Jan-19 7:03am View

Explanation is crystal clear! Let's say I have multiple Receive() in client application and I'm in need to send message or data from server. How to send the message to specific Receive()? I indeed googled for examples but no luck. Please throw some light with example. Thank you!

rmds 22-Jan-19 5:28am View

Pls correct me if I'm wrong. You mean to say like this?
"SockConnection.Send(L"Myinputfiledata", 0);"

rmds 21-Jan-19 12:46pm View

Is there a way to save the file to drive... instead of CFile::ModeCreate and then write into file? I dont wanna create file and then write into it. Thanks!

rmds 21-Jan-19 12:33pm View

I also have another doubt. I'm sending file from server to client using CSocket. I'm calling Socketid.Receive() in client end. Where the text file will be received? Here's the snippet.
"Server-end"
ULONGLONG dwLength = sourceFile.GetLength();
char* buffer = new char[(int)dwLength + 1];
buffer[dwLength] = 0;
UINT nActual = sourceFile.Read(buffer, dwLength);
if(DataBytes == SOCKET_ERROR) {
AfxMessageBox(L"Error while sending");
return;
}
nActual = nActual - DataBytes;
}
"Client-End"

char *pBuf =new char [1025];
CString strData;
int iLen;
iLen=m_SocketClient.Receive(pBuf,1024);

After I run this code, I'm not finding any text file in Client Folder.

rmds 21-Jan-19 12:23pm View

Thanks! you're eye opener

rmds 21-Jan-19 8:20am View

I don't get it.

rmds 21-Jan-19 8:19am View

This is what I get in lBytesRead in debugging
"lBytesRead 44 unsigned int"

rmds 21-Jan-19 8:19am View

This is what I get in lBytesRead in debugging
"lBytesRead 44 unsigned int"

rmds 19-Jan-19 0:59am View

The purpose here to transfer files through MFC socket. Using copyfile() doesn't serve the purpose. Any input would be greatly appreciated. Thanks!

rmds 17-Jan-19 0:34am View

I'm not particularly using any button to transfer file. Once connection is made, the file should be transferred from server folder to client folder in same computer.

rmds 16-Jan-19 1:14am View

Now I'm able to spy and notify any changes in directory. How to send the modified files to other connected client application? Do I need to implement thread or any simple method available?

rmds 16-Jan-19 0:58am View

That was really helpful! tqvm...

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