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我有第三方控制檯應用程序,打印幾行和立即退出(或等待按鍵被關閉 - 取決於使用的參數)。我想從我自己的控制檯程序運行此應用程序,並將其輸出到我的緩衝區。我試過這種方法,但它不起作用:如何閱讀控制檯應用程序的輸出?
....
HANDLE stdRead, stdWrite;
SECURITY_ATTRIBUTES PipeSecurity;
ZeroMemory (&PipeSecurity, sizeof (SECURITY_ATTRIBUTES));
PipeSecurity.nLength = sizeof (SECURITY_ATTRIBUTES);
PipeSecurity.bInheritHandle = true;
PipeSecurity.lpSecurityDescriptor = NULL;
CreatePipe (&stdRead, &stdWrite, &PipeSecurity, NULL)
STARTUPINFO sinfo;
ZeroMemory (&sinfo, sizeof (STARTUPINFO));
sinfo.cb = sizeof (STARTUPINFO);
sinfo.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
sinfo.hStdInput = stdWrite;
sinfo.hStdOutput = stdRead;
sinfo.hStdError = stdRead;
sinfo.wShowWindow = SW_SHOW;
CreateProcess (NULL, CommandLine, &PipeSecurity, &PipeSecurity, TRUE, NORMAL_PRIORITY_CLASS | CREATE_NEW_CONSOLE | CREATE_UNICODE_ENVIRONMENT, NULL, NULL, &sinfo, &pi))
DWORD dwRetFromWait= WAIT_TIMEOUT;
while (dwRetFromWait != WAIT_OBJECT_0)
{
dwRetFromWait = WaitForSingleObject (pi.hProcess, 10);
if (dwRetFromWait == WAIT_ABANDONED)
break;
//--- else (WAIT_OBJECT_0 or WAIT_TIMEOUT) process the pipe data
while (ReadFromPipeNoWait (stdRead, Buffer, STD_BUFFER_MAX) > 0)
{
int iLen= 0; //just for a breakpoint, it never breaks here
}
}
....
int ReadFromPipeNoWait (HANDLE hPipe, WCHAR *pDest, int nMax)
{
DWORD nBytesRead = 0;
DWORD nAvailBytes;
WCHAR cTmp [10];
ZeroMemory (pDest, nMax * sizeof (WCHAR));
// -- check for something in the pipe
PeekNamedPipe (hPipe, &cTmp, 20, NULL, &nAvailBytes, NULL);
if (nAvailBytes == 0)
return (nBytesRead); //always ends here + cTmp contains crap
// OK, something there... read it
ReadFile (hPipe, pDest, nMax-1, &nBytesRead, NULL);
return nBytesRead;
}
如果我刪除PeekNamedPipe,它只是掛在ReadFile上,什麼也不做。任何想法可能是錯誤的?管道不是不幸的我的一杯茶,我只是把在互聯網上找到的一些代碼放在一起。
非常感謝。只有當你發現不工作,做一些更復雜的解決您遇到的特定問題(S)
char tmp[1024];
std::string buffer;
FILE *child = _popen("child prog.exe", "r");
if (NULL == child)
throw std::runtime_error("Unable to spawn child program");
while (fgets(tmp, sizeof(tmp), child))
buffer += tmp;
:
在命令提示符處輸入'appname> output.txt 2>&1'並查看輸出是否被重定向到文本文件。如果是這樣,你的代碼有問題。否則,你需要一種不同的方法。 – arx