CreateProcess create pipes to read data-CodePudding

Program loop to read data, but every time CreateProcess create pipeline data read
Question:
Can be created only once, back to read, because every time see the CreateProcess create waste 200-300 ms time,

 
SECURITY_ATTRIBUTES sa; 
HANDLE hRead, hWrite; 
Sa. NLength=sizeof (SECURITY_ATTRIBUTES); 
Sa. The lpSecurityDescriptor=NULL; 
Sa. BInheritHandle=TRUE; 
if (! The CreatePipe (& amp; HRead, & amp; HWrite, & amp; Sa, 0)) {
ShowLocalizedMsg (" Error On CreatePipe () "); 
return 0; 
} 

STARTUPINFO si; 
PROCESS_INFORMATION PI; 
Si. Cb=sizeof (STARTUPINFO); 
GetStartupInfo (& amp; Si); 
Si. HStdError=hWrite; 
Si. HStdOutput=hWrite; 
Si. WShowWindow=SW_HIDE; 
Si. DwFlags=STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES; 
if (! CreateProcess (NULL, 
"C: \ \ Windows \ \ system32 \ \ CMD exe", 
NULL, 
NULL, 
TRUE, 
NULL, 
NULL, 
NULL, 
& Si, 
& PI) 
) {
ShowLocalizedMsg (" Error on CreateProcess () "); 
return 0; 
} 

The CloseHandle (hWrite); 
Char buffer [4096]={0}; 
DWORD bytesRead; 
While (true) {
If (ReadFile (hRead, buffer, 4095, & amp; BytesRead, NULL)==NULL) 
break; 
Printf (" % s \ n ", buffer); 
Sleep (200); 
} 
return 0;

CodePudding user response:

Can be created at a time, to manage a permanent use, we handle