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Assuming your struct has integers, use CString::Format() to make a string representation of the numbers, and write that string to the file.
--Mike--
http://home.inreach.com/mdunn/
#include "buffy_sig"
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#define ID 10
#define NAME 26
typedef struct person{
char id[ID];
char name[NAME];
}person;
typedef person* p_person;
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I want that in my file will be write:
________
id
name
time
________
but I dont success.
This is my code:
____________
str = "\n"; //not work !
file.SeekToEnd()
file.Write(p->id, sizeof(char)*ID);
file.Write(str, str.GetLength());
file.Write(p->name,sizeof(char)*NAME);
file.Write(str, str.GetLength());
file.Write(str_time, str_time.GetLength());
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Does anyone know the functions windows calls to do an addnetwork connection. I do not want to assign it to a drive though, but rather treat it as a webfolder.
Thanks for any help
qVL
qluu@limitless.ca
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Is there any method that convert a CTime in seconds? Thanks
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Hi there,
You should look at CTimeSpan. (CTime - CTimeSpan = CTime...)
CTimeSpan has a function called GetTotalSeconds(),
example:
CTimeSpan myDiff(0,1,0,0); // 0 Days, 1 Hour, 0 Min, 0 Sec
ASSERT (myDiff.GetTotalSeconds()==3600);
hope this helps
Olli
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Hello,
I have a program written in Visual C++ and I want to add some codes that can help me know
this program is being debigged (ex: in debug mode in Visual C++ ) in run-time.
Does anybody know how to do that ?
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there is _DEBUG macro if your project's active configuration [Build->Set Active Configuration]is derived from Debug.
So you can check like this
#ifdef _DEBUG
//Run this code if in debug mode
#else
//Run this code if not in debug mode
#endif
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There's a function you can call. I forget the name but it's something like IsDebuggerEnabled().
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I get crappy things when I try and return a CString. It goes a little like this...
CString lotsofcrap;
blah blah
return lotsofcrap;
ERROR Unhandled exception...yadda yaddda
CString::CString(const CString& stringSrc)
{
ASSERT(stringSrc.GetData()->nRefs != 0); //**** DEBUGGER GOES TO THIS LINE
if (stringSrc.GetData()->nRefs >= 0)
{
ASSERT(stringSrc.GetData() != _afxDataNil);
m_pchData = stringSrc.m_pchData;
InterlockedIncrement(&GetData()->nRefs);
}
else
{
Init();
*this = stringSrc.m_pchData;
}
}
------------------------------------------------------
Why do it now when you can put it off and do it tomorrow?
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K....
CString CLUPort::BuildStartCommand()
{
LUMessage msg;
CString strConnect;
memset(&msg, 0, sizeof(LUMessage));
msg.start.cmd = START;
msg.start.crc16 = crc16_checksum((byte_t *)&msg, sizeof(msg.start) - 2);
msg.start.crc16 = TO_buint16(msg.start.crc16);
memcpy(&strConnect, &msg, sizeof(msg.start));
return strConnect;
}
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It's the memcpy bit - you need to get a pointer to the buffer and store data there rather than over the string object itself. See GetBuffer (I think) - also don't forget you need to make sure the buffer is of the correct length.
> Andrew.
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Ok a little bit of reading convinces me that's the correct way to do this. However I don't understand what the buffer length is/should be. MSDN describes it to be "The minimum size of the character buffer in characters. This value does not include space for a null terminator." Eh?? Does this mean I need to specify a number greater than the largest possible length of the string-to-be?
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The problem is in the memcpy()
You can't asign the mem to a CString
cheers!!!
Carlos Antollini.
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You have overwritten CString object with LUMessage struct contents. CString is a C++ class, you can't write to CStrings using memcpy.
I have no idea what are the members of LUMessage (crc16 suggests ints) - you should convert them to strings and concatenate them in strConnect.
Tomasz Sowinski -- http://www.shooltz.com.pl
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Version II:
CString CLUPort::BuildStartCommand()
{
LUMessage msg;
CString strConnect;
LPTSTR pBuffer = strConnect.GetBuffer(1);
memset(&msg, 0, sizeof(LUMessage));
msg.start.cmd = START;
msg.start.crc16 = crc16_checksum((byte_t *)&msg, sizeof(msg.start) - 2);
msg.start.crc16 = TO_buint16(msg.start.crc16);
memcpy(pBuffer, &msg, sizeof(msg.start));
strConnect.ReleaseBuffer();
return strConnect;
}
This seems to only copy msg.start.cmd into strConnect, but I need the whole msg.start struct...
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Hi,
Replace this;
strConnect.GetBuffer(1);
with;
strConnect.GetBuffer(sizeof(msg.start));
Hope that helps.
> Andrew.
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Been there, done that. Whether I put 1, 100, or sizeof(msg.start) I get the same result each time. pBuffer seems to get the value of only msg.start.cmd instead of all of msg.start.
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Without information about the data types of LUMessage struct nobody here will be able to help you.
Tomasz Sowinski -- http://www.shooltz.com.pl
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There may be a zero byte after msg.start.cmd, this will cause ReleaseBuffer() to cut the string at that point.
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One suggestion:
Instead of returning a CString, I would suggest passing one as a parameter by reference and manipulating it. Also, memcpy doesn't work well with CString (too much detail involved in explaining why -- basically, the memory structure is different than a normail C-style character arrary).
Zac Howland
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> One suggestion: Instead of returning a CString, I would
> suggest passing one as a parameter by reference and manipulating it
Why? CString uses copy-on-write - the cost of copy constructor call is very low (no memory allocations are performed).
Tomasz Sowinski -- http://www.shooltz.com.pl
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