Segmentation fault on deleting a struct

[coders123]

I'm exentending existing C++ application. It have struct as below.

struct Message
{
	char	z_Date[10];
	char	z_Code[14];

	Message()
	{
		z_Date[0] = '\0';
		z_Code[0] = '\0';
	}
}

Then it has created a pointer to that struct as Message* pMsg = new Message(); and filled the Message variables. For ex. as below.
pMsg->z_Date has value "15/09";
pMsg->z_Code has value "ABCDEFGHIGHJ"

Then it has created a key using these z_Date and z_Code, insert that key in to map, and finally delete that pMsg pointer. That is something like that.

struct ltstr
{
	bool operator()(const char* s1, const char* s2) const	
	{		
		return strcmp(s1, s2) < 0;	
	}
};

map<const char*, int, ltstr>	map_test;
char	z_Key[40];
sprintf(z_Key,"%s%c%s",pMsg->z_Code,':',pMsg->z_Date);
std::map<const char*, int, ltstr>::iterator iteMap(map_test.find(z_Key));
if iteMap!= map_test.end())
{
	int i =   iteMap->second);
	//Continue the processing with thie int i here.
}
else
{	
	map_test.insert(make_pair(z_Key, 25));
}

//Here goes some code which use the pMsg.
delete pMsg;

//Here after map_test is using till the end of the program. 

Although this pMsg has deleted, after that map_test is used through out the entire program. The above mentioned code is working with out any issue.

Now what I need to do is change that key. In the above way z_Key is ABCDEFGHIGHJ:15/09. But now I need the key as ABCDEFGHIGHJ:1509 (by removing the middle /). So I did the following.

char zBuf[10];
strcpy(zBuf, pMsg->z_Date);
char zMonth[3];
char zDate[3];
strcpy(zMonth,zBuf+3);
zBuf[2] = '\0';
strcpy(zDate,zBuf);

char	z_Key[40];
sprintf(z_Key,"%s%c%s%s",pMsg->z_Code,':',zDate,zMonth);

Is this the best way to make the key? Although it gives the key correctly sometimes it gives a run time error(segmentation fault) at the line delete pMsg.

Can someone please help me on this.

[kbw]

All those temporary buffers and copying without length checking make me want to shut down.

Can you not find a safer way to build that key?