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我有一個問題，定義一個DLL使用的回調函數來獲取DLL的其他功能的日誌。 以下是C函數：Python的回調ctypes功能與va_list
typedef void (RTMP_LogCallback)(int level, const char *fmt, va_list);
void RTMP_LogPrintf(const char *format, ...);
這裏是我的Python代碼：
dll = cdll.LoadLibrary('bin/librtmp.dll')
CMPFUNC = CFUNCTYPE(c_int, c_int, c_char_p, c_void_p)
def logCallBack(level, message, va_list):
dll.RTMP_LogPrintf(message, va_list)
return 0
的問題是，日誌是骯髒和不可讀：
Parsed host : ☺Parsed app : ☺connect to stream
ÄßGj♫¨', ... connected, handshaking?ßGj♥: Type Answer : 27DBEC?ßGjä?┼♣: Server Uptime : 2612204?ßGj♥: FMS Version : 2612204.2612100.488283845.4882
83530?ßGj♥: Handshaking finished....ÄßGj♫¨', handshaked│°Gj♀☻: fd=2614284, size=2614180Invoking ▒?'ä°Gj♀☻: fd=2618556`÷Gjá%&: server BW = 2618572ä°Gj♀
☻: fd=2618556o÷Gjá%&: client BW = 2618572 2618468ä°Gj♀☻: fd=2618556?÷Gj, received ctrl. type: 2618572, len: 2618468?÷Gj, Stream Begin 2618572ä°Gj♀☻: f
d=26185568÷Gj, received: chunk size change to 2618572ä°Gj♀☻: fd=2618556N÷Gj♣☺, received: invoke 2618572 bytes(object begin)Property: <|±'☺>Property: <
|±'☺>Property: <|±'OBJECT>(object begin)Property: <,´'☺>Property: <,´'☺>Property: <,´'☺>(object end)Property: <|±'OBJECT>(object begin)Property: <,´'☺
>Property: <,´'☺>Property: <,´'☺>Property: <,´'OBJECT>(object begin)Property: <▄ý'☺>(object end)Property: <,´'☺>Property: <,´'☺>(object end)(object en
d)~÷Gjmt;, server invoking <☺>~÷Gj, received result for method call <☺>│°Gj♀☻: fd=2616844, size=2616740sending ctrl. type: 0x27f264│°Gj♀☻: fd=2616828,
size=2616724│°Gj♀☻: fd=2616828, size=2616724Invoking ?‗'UsherToken: ú?B☻,☺│°Gj♀☻: fd=2617164, size=2617060Invoking)¶'ä°Gj♀☻: fd=2618556N÷Gj↔, receiv
ed: invoke 2618572 bytes(object begin)Property: <|±'☺>Property: <|±'☺>Property: NULLProperty: <|±'☺>(object end)~÷Gj?⌂;, server invoking <☺>~÷Gj8¶;, r
eceived result for method call <☺>¶÷Gj, seekTime=2617308, stopTime=2617204, sending play: â─↑?♥â╚*?e¶╔├U?ýâý►SVW?¨?w►?E*ëE??F♦┴Ó☻?┌??↨│°Gj♀☻: fd=26171
64, size=2617060Invoking)¶'sending ctrl. type: 0x27f264│°Gj♀☻: fd=2616828, size=2616724ä°Gj♀☻: fd=2618556N÷Gj%, received: invoke 2618572 bytes(object
begin)Property: <|±'☺>Property: <|±'☺>Property: NULLProperty: <|±'☺>(object end)~÷Gj?⌂;, server invoking <☺>~÷Gj, received result id 2617308 without
matching requestä°Gj♀☻: fd=2618556?÷Gj, received ctrl. type: 2618572, len: 2618468?÷Gj☺, Stream Begin 2618572ä°Gj♀☻: fd=2618556N÷Gjö, received: invoke
2618572 bytes(object begin)Property: <|±'☺>Property: <|±'☺>Property: NULLProperty: <|±'OBJECT>(object begin)Property: <,´'☺>Property: <,´'☺>Property:
<,´'☺>Property: <,´'☺>(object end)(object end)~÷Gj?t;, server invoking <☺>~÷Gj┴t;, onStatus: ☺ä°Gj♀☻: fd=2618556N÷Gj?, received: invoke 2618572 bytes
(object begin)Property: <|±'☺>Property: <|±'☺>Property: NULLProperty: <|±'OBJECT>(object begin)Property: <,´'☺>Property: <,´'☺>Property: <,´'☺>Propert, ...etc
我也試着打印直接留言如下：
def logCallBack(level, message, va_list):
print message
return 0
但此時，記錄不完整：
%s, ... connected, handshaking
%s: Type Answer : %02X
%s: Server Uptime : %d
%s: FMS Version : %d.%d.%d.%d
%s: Handshaking finished....
%s, handshaked
%s: fd=%d, size=%d
Invoking %s
%s: fd=%d
%s: server BW = %d
%s: fd=%d
%s: client BW = %d %d
%s: fd=%d
%s, received ctrl. type: %d, len: %d
... etc
有誰知道豪解決這個問題？
在此先感謝。
問候，Gontran
編輯：
根據該螺紋（http://www.digipedia.pl/usenet/thread/15901/197/），ctypes的不提供處理可變參數的功能的一種方式。我明白這一點。但是爲什麼使用RTMP_LogPrintf（）函數無法正常工作？我的印象是，我正在通過正確的論點。
的信息，RTMP_LogPrintf（）的定義是這樣的：
void RTMP_LogPrintf(const char *format, ...)
{
char str[MAX_PRINT_LEN]="";
int len;
va_list args;
va_start(args, format);
len = vsnprintf(str, MAX_PRINT_LEN-1, format, args);
va_end(args);
if (RTMP_debuglevel==RTMP_LOGCRIT)
return;
if (!fmsg) fmsg = stderr;
if (neednl) {
putc('\n', fmsg);
neednl = 0;
}
if (len > MAX_PRINT_LEN-1)
len = MAX_PRINT_LEN-1;
fprintf(fmsg, "%s", str);
if (str[len-1] == '\n')
fflush(fmsg);
}
我看到了悲傷的臉。我知道這意味着什麼'☺' – Doboy 2012-03-20 07:37:30