首先我把代码贴出来吧.sa.nLength:= SizeOf(sa);
sa.lpSecurityDescriptor:= nil;
sa.bInheritHandle:= True;
if not CreatePipe(hOutRead, hOutWrite, @sa, 0) then
begin
ShowMessage('CreatePipe Error!!!');
Exit;
end;
ZeroMemory(@Buf[0],1024);
ZeroMemory(@si, SizeOf(si));
si.cb:= SizeOf(si);
si.dwFlags:= STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES;
si.wShowWindow:= SW_HIDE;
si.hStdOutput:= hOutWrite;
si.hStdError:= hOutWrite;
if not CreateProcess(nil,'E:\MinGW\Bin\gcc.exe c:\2_3.c -o c:\2_3.exe -O2 -Wall -lm -DONLINE_JUDGE',nil,nil,True,CREATE_NEW_CONSOLE,nil,nil,si,pi) then
begin
ShowMessage('CreateProcess Error!!!');
Exit;
end; case WaitForSingleObject(pi.hProcess, 2000) of
WAIT_OBJECT_0:
begin
CloseHandle(hOutWrite) ;
if ReadFile(hOutRead,Buf, 1024, dwCount, nil) then
begin
ShowMessage('GetReadBack: ' + StrPas(PChar(@buf[0])));
end
else
begin
dwCount:= GetLastError;
ShowMessage(IntToStr(dwCount));
end;
end;
WAIT_TIMEOUT:
TerminateProcess(pi.hProcess, 100);
end;
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
调试过程中,发现ReadFile返回false了,而GetLastError返回109也就是Error_Broken_Pipe
如果在ReadFile前不关闭写入端hOutWrite的话,ReadFile函数会阻塞.
求解,如何解决这个问题.
sa.lpSecurityDescriptor:= nil;
sa.bInheritHandle:= True;
if not CreatePipe(hOutRead, hOutWrite, @sa, 0) then
begin
ShowMessage('CreatePipe Error!!!');
Exit;
end;
ZeroMemory(@Buf[0],1024);
ZeroMemory(@si, SizeOf(si));
si.cb:= SizeOf(si);
si.dwFlags:= STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES;
si.wShowWindow:= SW_HIDE;
si.hStdOutput:= hOutWrite;
si.hStdError:= hOutWrite;
if not CreateProcess(nil,'E:\MinGW\Bin\gcc.exe c:\2_3.c -o c:\2_3.exe -O2 -Wall -lm -DONLINE_JUDGE',nil,nil,True,CREATE_NEW_CONSOLE,nil,nil,si,pi) then
begin
ShowMessage('CreateProcess Error!!!');
Exit;
end; case WaitForSingleObject(pi.hProcess, 2000) of
WAIT_OBJECT_0:
begin
CloseHandle(hOutWrite) ;
if ReadFile(hOutRead,Buf, 1024, dwCount, nil) then
begin
ShowMessage('GetReadBack: ' + StrPas(PChar(@buf[0])));
end
else
begin
dwCount:= GetLastError;
ShowMessage(IntToStr(dwCount));
end;
end;
WAIT_TIMEOUT:
TerminateProcess(pi.hProcess, 100);
end;
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
调试过程中,发现ReadFile返回false了,而GetLastError返回109也就是Error_Broken_Pipe
如果在ReadFile前不关闭写入端hOutWrite的话,ReadFile函数会阻塞.
求解,如何解决这个问题.
解决方案 »
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