windows系统调用 利用事件对象实现进程通信

#include "iostream"
#include "windows.h"
#include "cstring"
using namespace std;

static LPCTSTR g_szContinueEvent="w2kdg.EventDemo.event.Continue";

BOOL CreateChild(){
    TCHAR szFilename[MAX_PATH];
    GetModuleFileName(NULL,szFilename,MAX_PATH);

    TCHAR szCmdLine[MAX_PATH];
    sprintf_s(szCmdLine,""%s" child",szFilename);

    STARTUPINFO si;
    ZeroMemory(reinterpret_cast<void*>(&si),sizeof(si));
    si.cb=sizeof(si);

    PROCESS_INFORMATION pi;

    BOOL bCreateOK=CreateProcess(
        szFilename,
        szCmdLine,
        NULL,
        NULL,
        FALSE,
        0,
        NULL,
        NULL,
        &si,
        &pi
        
        );

    if(bCreateOK){
        CloseHandle(pi.hProcess);
        CloseHandle(pi.hThread);
    }

    return (bCreateOK);

}

void WaitForChild(){
    HANDLE hEventContinue=CreateEvent(
        NULL,
        TRUE,
        FALSE,
        g_szContinueEvent
        );

    if(hEventContinue!=NULL){
        printf("Event creates.
");
        if(CreateChild()){
            printf("Child process created.
");
            printf("Parent process waiting on child process.
");
            WaitForSingleObject(hEventContinue,INFINITE);
            printf("Parent process received the event signaling from child process.
");
        }

        CloseHandle(hEventContinue);
    }

}

void SignalParent(){
    HANDLE hEventContinue=OpenEvent(
        EVENT_MODIFY_STATE,
        FALSE,
        g_szContinueEvent
        );

    if(hEventContinue!=NULL){
        SetEvent(hEventContinue);
        printf("Child process begining...
");
    }

    CloseHandle(hEventContinue);
}

int main(int argc,char *argv[]){
    if(argc>1&&strcmp(argv[1],"child")==0){
        SignalParent();
    }
    else{
    
    WaitForChild();
    printf("Parent process released.
");
    }
    getchar();
    return 0;

}