Is a "Visual c + + development of actual combat, 1200 cases in the sample code, one is your own programs, after changed the sample code added,
At first two programs can be used, then, after restart the server, only the sample code available
Their application error is in the final connect the sentences, an invalid pointer, debug, discovery was jpop after creation is still null pointer

 jmail: : IMessagesPtr JMSG; 
Jmail: : IPOP3Ptr jpop; 
Jpop. CreateInstance (__uuidof (jmail: : POP3)); 
JMSG. CreateInstance (__uuidof (jmail: : Message)); 
Jpop - & gt; Timeout=120; 
Jpop - & gt; The Connect ((_bstr_t) strusr, (_bstr_t) STRPWD, (_bstr_t) strpop, 110); 

Very puzzling, the jmail. Registered DLL, unloading, server restart countless times to do this,

CodePudding user response:

Please check the return values of each function call
Please use the try... The catch... Capture the catch all exceptions,

Sometimes not to "call a function name + each parameter value, after entering the function of each parameter values, intermediate variable values, exit the function return value of preparation, return to the function to call after the function value of the parameter name + + return value" this information to write logs to a file is where no matter how to also can not find the problem, including capture all kinds of abnormal, writing log to the screen and single step or set a breakpoint or generating core or DMP file,... These methods are not! Write logs to a file reference below:

//loop to a function sends a length of 200 bytes (this is the fixed) buffer, 
//a function need to incoming buffer, the circulation of 240 bytes (fixed) new buffer for processing, 
//when dealing with each new printing takes two bytes of the buffer 
# ifdef _MSC_VER 
# pragma warning (4996) disable: 
# endif 
# include & lt; Stdio. H> 
# include & lt; Stdlib. H> 
# include & lt; String. H> 
# ifdef _MSC_VER 
# include & lt; Windows. H> 
# include & lt; Process. H> 
# include & lt; IO. H> 
# define MYVOID void 
# define vsnprintf _vsnprintf 
# the else 
# include & lt; Unistd. H> 
# include & lt; Sys/time. H> 
# include & lt; Pthread. H> 
# define CRITICAL_SECTION pthread_mutex_t 
# define MYVOID void * 
# endif 
//the Log {
# define MAXLOGSIZE 20000000 
# define MAXLINSIZE 16000 
# include & lt; Time. H> 
# include & lt; Sys/timeb. H> 
# include & lt; Stdarg. H> 
Char logfilename1 []="MyLog1. Log"; 
Char logfilename2 []="MyLog2. Log"; 
The static char logstr [MAXLINSIZE + 1]; 
Char datestr [16]. 
Char timestr [16]. 
Char MSS [4]. 
CRITICAL_SECTION cs_log; 
The FILE * flog; 
# ifdef _MSC_VER 
The Lock (CRITICAL_SECTION void * l) {
The EnterCriticalSection (l); 
} 
Void Unlock (CRITICAL_SECTION * l) {
LeaveCriticalSection (l); 
} 
Void sleep_ms (int) ms {
Sleep (ms). 
} 
# the else 
The Lock (CRITICAL_SECTION void * l) {
Pthread_mutex_lock (l); 
} 
Void Unlock (CRITICAL_SECTION * l) {
Pthread_mutex_unlock (l); 
} 
Void sleep_ms (int) ms {
Usleep (ms * 1000); 
} 
# endif 
Void LogV (const char * pszFmt, va_list argp) {
* struct tm now; 
Struct timeb TB; 

If (NULL==pszFmt | | 0==pszFmt [0]) return; 
Vsnprintf (logstr, MAXLINSIZE pszFmt, argp); 
Ftime (& amp; TB); 
Now=localtime (& amp; TB. Time); 
Sprintf (datestr, "% d % % 4 d - 02-02 d", now - & gt; Tm_year + 1900, now - & gt; Tm_mon + 1, now - & gt; Tm_mday); 
Sprintf (timestr, "02 02 02 % d: % d: % d", now - & gt; Tm_hour, now - & gt; Tm_min, now - & gt; Tm_sec); 
Sprintf (MSS, "% 3 d", TB. Millitm); 
Printf (" % s % s. % s % s ", datestr, timestr, MSS, logstr); 
Flog=fopen (logfilename1, "a"); 
If (NULL! Flog)={
Fprintf (flog, "% s % s. % s % s", datestr, timestr, MSS, logstr); 
If (ftell (flog) & gt; MAXLOGSIZE) {
The fclose (flog); 
If (rename (logfilename1 logfilename2)) {
Remove (logfilename2); 
Rename (logfilename1 logfilename2); 
} 
} else {
The fclose (flog); 
} 
} 
} 
Void the Log (const char * pszFmt,... ) {
Va_list argp; 

The Lock (& amp; Cs_log); 
Va_start (argp, pszFmt); 
LogV (pszFmt argp); 
Va_end (argp); 
Unlock (& amp; Cs_log); 
} 
//the Log} 
# define ASIZE 200 
# define BSIZE 240 
# define CSIZE 2 
Char Abuf [ASIZE]; 
Char Cbuf [CSIZE]; 
CRITICAL_SECTION cs_HEX; 
CRITICAL_SECTION cs_BBB; 
Struct FIFO_BUFFER {
Int the head; 
Int tail; 
Int size; 
Char data [BSIZE]; 
} BBB; 
Int No_Loop=0; 
Void HexDump) (int cn, char * buf, int len) {
Int I, j, k; 
Char binstr [80]. 

The Lock (& amp; Cs_HEX); 
for (i=0; IIf (0==16) (I %) {
Sprintf (binstr, "% 3 d % 4 x -", cn, I); 
Sprintf (binstr, "% s % 02 x", binstr, buf (unsigned char) [I]); 
} else if (15==16) (I %) {
Sprintf (binstr, "% s % 02 x", binstr, buf (unsigned char) [I]); 
Sprintf (binstr, "% s", binstr); 
For (j=I - 15; J<=I; J++) {
Sprintf (binstr, "% s % c," binstr, ('! '& lt; Buf [j] & amp; & Buf [j] <='~')? Buf [j] : '. '); 
} 
The Log (" % s \ n ", binstr); 
} else {
Sprintf (binstr, "% s % 02 x", binstr, buf (unsigned char) [I]); 
} 
} 
If (0! 16)=(I %) {
16 k=16 - (I %); 
For (j=0; JSprintf (binstr, "% s", binstr); 
} 
Sprintf (binstr, "% s", binstr); 
K=16 - k; 
For (j=I - k; JSprintf (binstr, "% s % c," binstr, ('! '& lt; Buf [j] & amp; & Buf [j] <='~')? Buf [j] : '. '); 
} 
The Log (" % s \ n ", binstr); 
} 
Unlock (& amp; Cs_HEX); 
} 
Int GetFromRBuf (int cn, CRITICAL_SECTION * cs, struct FIFO_BUFFER * fbuf, char * buf, int len) {
Int lent, len1 len2; 

Lent=0; 
The Lock (cs); 
If (fbuf - & gt; Size> Len)={
Lent=len; 
If (fbuf - & gt; The head + lent> BSIZE) {
Len1=BSIZE fbuf - & gt; The head; 
Memcpy (buf, fbuf - & gt; The data + fbuf - & gt; nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnull