c语言如何获取a.out的进程id，int id=system("ps -C a.out")返回0.如何返回正确ID

这个一般的做法就是

A进程启动悔谨，通碧拦基过getpid获取自己的pid

把自己的pid写入到文件pidfile

B通过读取该文件获取A进程的pid

要用到A的pid，一般都是衡咐写文件的

#include <首纯含sys/types.h>

#include <裤亏unistd.h>

int main(void)

{

int i=2

pid_t pid

while(i--){

if((pid=fork())<0){

err_sys("fork error\n")

exit(1)

}

else if(pid==0){

printf("Child Thread: my pid is %d.\者笑n",getpid())

break

}else{

printf("Parent Thread: create thread, pid is %d.\n",pid)

}

}

exit(0)

}

HRESULThres

VARIANT vInst_

hres = pObject->Get(L"TargetInstance", 0, &vInst_, 0, 0)

if(FAILED(hres))

{

cout <<"Failed to get TargetInstance: "<<hres <<endl

continue

}//if

try

{

_variant_t vInst

vInst.Attach(vInst_)// use C++ class to manage VARIANT

IWbemClassObjectPtr pWin32ProcessObj(vInst)

VARIANT vVar

hres = pWin32ProcessObj->Get(L"ExecutablePath", 0, &vVar, 0, 0)

if(FAILED(hres))

{

cout <<"Failed to get ExecutablePath: "<<hres <滑银<endl

}//if

else

{

_variant_t vExecPath

vExecPath.Attach(vVar)

wcout <<L"ExecPath: "<<配模 (constwchar_t*)((_bstr_t)vExecPath) <<endl

}//else

}//信卖宴try

catch(_com_error &err)

{

cout <<"caught _com_error: "<<err.Error() <<endl

}//catch

进程ID就用L"ProcessID"获取

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