windows管道
本帖最后由 you13fire 于 2012-10-03 10:07:14 编辑 我改写的一个管道通信程序，因为子进程有多个输入输出组合语句，如（scanf,printf,再scanf,printf...),父进程先WriteFile(对应第一个scanf)，再ReadFile,发现此时ReadFile阻塞；而一次性WriteFile两个参数时，ReadFile不会阻塞。我的本意是想让VC调试程序的界面调试信息写入到一个txt中。符上代码:
//VS2010 主程序


#include "stdafx.h"

#include "stdafx.h"
#include "Windows.h"
#include "stdio.h"

int main(int argc, char* argv[])
{
SECURITY_ATTRIBUTES sa,sa2;
HANDLE hInputRead,hInputWrite;
HANDLE hOutputRead,hOutputWrite;

sa.nLength = sizeof(SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = TRUE;
if (!CreatePipe(&hOutputRead,&hOutputWrite,&sa,0))
{
printf("Error On CreatePipe1");
return 1;
}

sa2.nLength = sizeof(SECURITY_ATTRIBUTES);
sa2.lpSecurityDescriptor = NULL;
sa2.bInheritHandle = TRUE;
if (!CreatePipe(&hInputRead,&hInputWrite,&sa2,0))
{
printf("Error On CreatePipe2");
return 1;
}

STARTUPINFO si;
PROCESS_INFORMATION pi;
si.cb = sizeof(STARTUPINFO);
GetStartupInfo(&si);
si.hStdError = hOutputWrite;
si.hStdOutput = hOutputWrite;
si.hStdInput = hInputRead;
si.wShowWindow = SW_SHOW;
si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;

TCHAR cmd_line[100];
lstrcpy(cmd_line,TEXT("D:\\test\\Debug\\test.exe"));
DWORD dwWritten;
if (!CreateProcess(NULL,cmd_line,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))
{
#ifdef UNICODE
wprintf(TEXT("Error On CreateProcess"));
#else
printf(TEXT("Error On CreateProcess"));
#endif
return 1;
}

CloseHandle(hInputRead);
CloseHandle(hOutputWrite);

char szInPut[]= ("12\r\n");// 输入//34\r\n23\r\n56\r\n

if(WriteFile(hInputWrite, szInPut, strlen(szInPut), &dwWritten, NULL))
printf("write success\n");

char buffer[32] = {0};
DWORD bytesRead;

if(ReadFile(hOutputRead,buffer,31,&bytesRead,NULL))
printf("read success: %s\n",buffer);
else
printf("error\n");

if(WriteFile(hInputWrite, szInPut, strlen(szInPut), &dwWritten, NULL))
printf("write success\n");

if(ReadFile(hOutputRead,buffer,31,&bytesRead,NULL))
printf("read success: %s\n",buffer);
else
printf("error\n");


Sleep(5000);
CloseHandle(hInputWrite);
CloseHandle(hOutputRead);
return 0;
}


/*test.cpp 子进程*/

#include "stdafx.h"
#include "stdio.h"
int main(int argc, char* argv[])
{
int x;
scanf( "%d", &x );
printf("x=%d\n",x);
scanf( "%d", &x );

printf("x=%d\n",x);
return 0;
}


[解决办法]

#include "stdafx.h"
#include "stdio.h"
int main(int argc, char* argv[])
{
int x;
scanf( "%d", &x );
printf("x=%d\n",x);
flushall();
scanf( "%d", &x );
 printf("x=%d\n",x);
flushall();
return 0;
}

试试
[解决办法]
你用AllocConsole不是更简单
http://blog.csdn.net/visualeleven/article/details/7628564