多线程的创建以及VC6.0下的编译设置.doc

多线程的创建 以及VC6.0下的编译设置示例一：#include #include using namespace std;DWORD WINAPI FunOne(LPVOID param)while(1) Sleep(300); coutThis is FunOne.endl;return 1;DWORD WINAPI FunTwo(LPVOID param)while(1) Sleep(300); coutThis is FunTwo.endl;return 1;int main(int argc,char * argv)DWORD lp1=0,lp2=0;HANDLE hand1=CreateThread(NULL,0,FunOne,NULL,CREATE_SUSPENDED,&lp1);HANDLE hand2=CreateThread(NULL,0,FunTwo,NULL,CREATE_SUSPENDED,&lp2);/system(pause);Sleep(2000);ResumeThread(hand1);ResumeThread(hand2);/system(pause);Sleep(6000);return 0;/*线程占用输出缓冲出现的问题This is FunOne.This is FunTwo.This is FunTwoThis is FunOne.This is FunTwThis is FunOne.o.This is FunOThis is FunTwo.ne.This is FunThis is FunOne.Two.This is FuThis is FunTwo.nOne.This is FThis is FunTwo.unOne.This is This is FunOne.FunTwo.This isThis is FunTwo.FunOne.This iThis is FunOne.s FunTwo.This This is FunTwo.is FunOne.ThisThis is FunOne.is FunTwo.ThiThis is FunTwo.s is FunOne.ThThis is FunOne.is is FunTwo.This is FunOne.This is FunTwo.This is FunOne.This is FunTwo.This is FunOne.This is FunTwo.This is FunOne.This is FunTwo.This is FunOne.This is FunTwo.Press any key to continue*/示例二：#include /#define MT/#define _MT#include #include using namespace std;void ThreadFunc1(PVOID param)Sleep(1000);coutThis is ThreadFunc1endl;void ThreadFunc2(PVOID param)Sleep(2000);coutThis is ThreadFunc2endl;int main()int i=0;_beginthread(ThreadFunc1,0,NULL);_beginthread(ThreadFunc2,0,NULL);Sleep(3000);coutendendl;_endthread();return 0;/*This is ThreadFunc1This is ThreadFunc2endPress any key to continue*/示例二的代码在VC6.0的默认设置下编译出错：d:c+osmulti thread 2.cpp(22) : error C2065: _beginthread : undeclared identifierd:c+osmulti thread 2.cpp(26) : error C2065: _endthread : undeclared identifier打开 process.h 发现如下代码段：#ifdef _MT_CRTIMP unsigned long _cdecl _beginthread (void (_cdecl *) (void *), unsigned, void *);_CRTIMP void _cdecl _endthread(void);_CRTIMP unsigned long _cdecl _beginthreadex(void *, unsigned, unsigned (_stdcall *) (void *), void *, unsigned, unsigned *);_CRTIMP void _cdecl _endthreadex(unsigned);#endif表示如果定义了 _MT(multi thread) 才会包含_beginthread 等函数的声明于是尝试在process.h之前定义一个 _MT (代码中红色注释部分)，结果出现了如下错误：multi thread 2.obj : error LNK2001: unresolved external symbol _endthreadmulti thread 2.obj : error LNK2001: unresolved external symbol _beginthreadlibcpmtd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol _unlocklibcpmtd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol _locklibcpmtd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol _setlc_activelibcpmtd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol _unguarded_readlc_active【错误原因分析】简单的define _MT 是包含了_beginthread等函数的声明，但是编译器并不会调用相关的dll(包含上述声明实现的函数)参与linking，所以出现了上述那么多未解决的外部标识符。【解决办法】编译器设置步骤如下： 工程 属性 C/C+ 分类：Code Gen