from:http://hi.baidu.com/erdosfish/blog/item/6d82aa180cf33e0634fa41e4.html
ACE應用程序鏈接錯誤 error LNK2019 的解決辦法
注意：是Stone Jiang寫的，我找到的文章。感謝他的文章！
讀者水平:初級 http://blog.csdn.net/FocusOnACE/archive/2006/07/09/896332.aspx
摘要：文本簡要指出如何正確編譯和鏈接ACE應用程序。
對于新手來說，ACE開發環境，會是一團謎團，如何正確配置開發者機器，快速體驗ACE，
就是本系列文章的目的。本文僅解決如何解決LNK2019錯誤
環境：
ACE版本 5.5.1
操作系統 Windows xp professional sp2
開發環境 Microsoft Visual C++ 2005 77626-009-0000007-41235
下面的代碼是服務的主程序
// @file: RegisterServer.cpp :
// @description: Defines the entry point for the GameService Daemon application.
// @date: 2006-07-06
// @author: Jiangtao<2005119@gmail.com>
#ifdef _DEBUG
#define ACE_NDEBUG 0
#define ACE_NTRACE 0
#endif
#include " stdafx.h "
#include " ACE/Filecache.h "
#include " ACE/Log_Msg.h "
#include " ACE/OS_NS_signal.h "
#include " ACE/Service_Config.h "
#ifdef ACE_HAS_SIG_C_FUNC
#pragma message ( " ACE_HAS_SIG_C_FUNC " )
extern " C "
{
#endif /* ACE_HAS_SIG_C_FUNC */
// call exit() so that static destructors get called
static void
handler ( int )
{
delete (ACE_Filecache * ) ACE_Filecache::instance ();
ACE_OS::exit ( 0 );
}
#ifdef ACE_HAS_SIG_C_FUNC
}
#endif /* ACE_HAS_SIG_C_FUNC */
int ACE_TMAIN( int argc, ACE_TCHAR * argv[])
{
ACE_DEBUG((LM_INFO,ACE_TEXT( " 啟動服務\n " )));
ACE_Service_Config daemon;
ACE_OS::signal (SIGCHLD, SIG_IGN);
// SigAction not needed since the handler will shutdown the server.
ACE_OS::signal (SIGINT, (ACE_SignalHandler) handler);
ACE_OS::signal (SIGUSR2, (ACE_SignalHandler) handler);
if (daemon.open (argc, argv, ACE_DEFAULT_LOGGER_KEY, 0 ) != 0 )
ACE_ERROR_RETURN ((LM_ERROR, " %p\n " , " open " ), 1 );
// The configured service creates threads, and the
// server won't exit until the threads die.
// Run forever, performing the configured services until we receive
// a SIGINT.
return 0 ;
}
服務加載的配置文件
###############################################################################
# file svc.conf
###############################################################################
dynamic GameService Service_Object * GameService: _make_GameServer_T() active
出錯提示:
----- Build started: Project: RegisterServer, Configuration: Debug Win32 ------
Compiling
RegisterServer.cpp
Linking
RegisterServer.obj : error LNK2019: unresolved external symbol
"__declspec(dllimport) int __cdecl ace_os_wmain_i(class ACE_Main_Base
&,int,wchar_t * * const)" (__imp_?ace_os_wmain_i@@YAHAAVACE_Main_Base@@HQAPA_W@Z) referenced in function _wmain
RegisterServer.obj : error LNK2019: unresolved external symbol
"__declspec(dllimport) public: static int __cdecl
ACE_Service_Config::open(int,wchar_t * * const,wchar_t const
*,int,int,int)" (__imp_?open@ACE_Service_Config@@SAHHQAPA_WPB_WHHH@Z) referenced in function "int __cdecl ace_wmain_i(int,wchar_t * * const)" (?ace_wmain_i@@YAHHQAPA_W@Z)
D:\ACE_OUTPUT\Game\\RegisterServerd.exe : fatal error LNK1120: 2 unresolved externals
Build log was saved at "file://d:\My Sources\RegisterService\RegisterServer\Debug\BuildLog.htm"
RegisterServer - 3 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 1 up-to-date, 0 skipped ==========
問題分析
出錯信息顯示，不能解析函數ace_os_wmain_i()以及 ACE_Service_Config::open()。
從這里可以看出，鏈接器需要UNICODE版本的ace庫，而我們在生成ACE的時候，并沒有生成寬字符
的UNICODE版本。
解決辦法：
打開項目的屬性頁，找到配置屬性，在字符集中，選擇多字節字符集。再重新編譯，問題解決。