C++ CreateProcess cmd.exe读/写管道死锁
你好,我正在尝试为cmd.exe制作一个前端GUI,这样我就可以使它更宽,但我被卡住了 我试图设计一个这样的APIC++ CreateProcess cmd.exe读/写管道死锁,c++,winapi,cmd,C++,Winapi,Cmd,你好,我正在尝试为cmd.exe制作一个前端GUI,这样我就可以使它更宽,但我被卡住了 我试图设计一个这样的API char* Directory = WriteCommand("dir"); printf("- %s\n", Directory); 输出看起来和cmd窗口中的完全一样,只是我把它放在字符串中,所以它是 DATE TIME FILESIZE FILENAME etc etc etc 然后我可以发布 char* Up = WriteCommand ("cd .."); 它会给
char* Directory = WriteCommand("dir");
printf("- %s\n", Directory);
输出看起来和cmd窗口中的完全一样,只是我把它放在字符串中,所以它是
DATE TIME FILESIZE FILENAME
etc etc etc
然后我可以发布
char* Up = WriteCommand ("cd ..");
它会给我上面的目录列表。所以我想要一个终端控件,通过使用管道进行读写
基于此MSDN示例代码,我尝试了很多方法-
但我认为这段代码只适用于发出一个命令并读取一个响应,因为在它死锁之后,正如这里所描述的-
我在这里看到了其他几个问题,比如这个问题,也有类似的问题,但没有一个解决方案适合我
这是我的代码
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <strsafe.h>
#define BUFSIZE 4096
HANDLE g_hChildStd_IN_Rd = NULL;
HANDLE g_hChildStd_IN_Wr = NULL;
HANDLE g_hChildStd_OUT_Rd = NULL;
HANDLE g_hChildStd_OUT_Wr = NULL;
HANDLE g_hInputFile = NULL;
void CreateChildProcess(void);
void WriteToPipe(char* Arg1);
void ReadFromPipe(void);
void ErrorExit(PTSTR);
int _tmain(int argc, TCHAR *argv[])
{
SECURITY_ATTRIBUTES saAttr;
printf("\n->Start of parent execution.\n");
// Set the bInheritHandle flag so pipe handles are inherited.
saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
saAttr.bInheritHandle = TRUE;
saAttr.lpSecurityDescriptor = NULL;
// Create a pipe for the child process's STDOUT.
if (!CreatePipe(&g_hChildStd_OUT_Rd, &g_hChildStd_OUT_Wr, &saAttr, 0))
ErrorExit(TEXT("StdoutRd CreatePipe"));
// Ensure the read handle to the pipe for STDOUT is not inherited.
if (!SetHandleInformation(g_hChildStd_OUT_Rd, HANDLE_FLAG_INHERIT, 0))
ErrorExit(TEXT("Stdout SetHandleInformation"));
// Create a pipe for the child process's STDIN.
if (!CreatePipe(&g_hChildStd_IN_Rd, &g_hChildStd_IN_Wr, &saAttr, 0))
ErrorExit(TEXT("Stdin CreatePipe"));
// Ensure the write handle to the pipe for STDIN is not inherited.
if (!SetHandleInformation(g_hChildStd_IN_Wr, HANDLE_FLAG_INHERIT, 0))
ErrorExit(TEXT("Stdin SetHandleInformation"));
// Create the child process.
CreateChildProcess();
// Get a handle to an input file for the parent.
// This example assumes a plain text file and uses string output to verify data flow.
/*if (argc == 1)
ErrorExit(TEXT("Please specify an input file.\n"));
g_hInputFile = CreateFile(
argv[1],
GENERIC_READ,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_READONLY,
NULL);
if (g_hInputFile == INVALID_HANDLE_VALUE)
ErrorExit(TEXT("CreateFile"));*/
// Write to the pipe that is the standard input for a child process.
// Data is written to the pipe's buffers, so it is not necessary to wait
// until the child process is running before writing data.
// Read from pipe that is the standard output for child process.
ReadFromPipe();
WriteToPipe("ipconfig");
// THIS IS WHERE DEADLOCK OCCURS, FROM HERE
// PROGRAM BECOMES UNRESPONSIVE - HOW TO FIX THIS?
ReadFromPipe();
printf("\n->End of parent execution.\n");
// The remaining open handles are cleaned up when this process terminates.
// To avoid resource leaks in a larger application, close handles explicitly.
return 0;
}
void CreateChildProcess()
// Create a child process that uses the previously created pipes for STDIN and STDOUT.
{
TCHAR szCmdline[] = TEXT("cmd.exe /k");
PROCESS_INFORMATION piProcInfo;
STARTUPINFO siStartInfo;
BOOL bSuccess = FALSE;
// Set up members of the PROCESS_INFORMATION structure.
ZeroMemory(&piProcInfo, sizeof(PROCESS_INFORMATION));
// Set up members of the STARTUPINFO structure.
// This structure specifies the STDIN and STDOUT handles for redirection.
ZeroMemory(&siStartInfo, sizeof(STARTUPINFO));
siStartInfo.cb = sizeof(STARTUPINFO);
siStartInfo.hStdError = g_hChildStd_OUT_Wr;
siStartInfo.hStdOutput = g_hChildStd_OUT_Wr;
siStartInfo.hStdInput = g_hChildStd_IN_Rd;
siStartInfo.dwFlags |= STARTF_USESTDHANDLES;
// Create the child process.
bSuccess = CreateProcess(NULL,
"cmd.exe", // command line
NULL, // process security attributes
NULL, // primary thread security attributes
TRUE, // handles are inherited
0, // creation flags
NULL, // use parent's environment
NULL, // use parent's current directory
&siStartInfo, // STARTUPINFO pointer
&piProcInfo); // receives PROCESS_INFORMATION
// If an error occurs, exit the application.
if (!bSuccess)
ErrorExit(TEXT("CreateProcess"));
else
{
// Close handles to the child process and its primary thread.
// Some applications might keep these handles to monitor the status
// of the child process, for example.
CloseHandle(piProcInfo.hProcess);
CloseHandle(piProcInfo.hThread);
}
}
void WriteToPipe(char* Command)
// Read from a file and write its contents to the pipe for the child's STDIN.
// Stop when there is no more data.
{
DWORD dwRead, dwWritten;
CHAR chBuf[BUFSIZE];
BOOL bSuccess = FALSE;
bSuccess = WriteFile(g_hChildStd_IN_Wr, Command, strlen(Command), &dwWritten, NULL);
if (bSuccess == FALSE)
printf("write fail\n");
printf("written = %i\n", dwWritten);
//for (;;)
//{
//bSuccess = ReadFile(g_hInputFile, chBuf, BUFSIZE, &dwRead, NULL);
//if (!bSuccess || dwRead == 0) break;
//bSuccess = WriteFile(g_hChildStd_IN_Wr, Command, strlen(Command), &dwWritten, NULL);
//if (bSuccess == FALSE)
//printf("write fail\n");
//printf("written = %i\n", dwWritten);
//}
// Close the pipe handle so the child process stops reading.
//if (!CloseHandle(g_hChildStd_IN_Wr))
//ErrorExit(TEXT("StdInWr CloseHandle"));
}
void ReadFromPipe(void)
// Read output from the child process's pipe for STDOUT
// and write to the parent process's pipe for STDOUT.
// Stop when there is no more data.
{
DWORD dwRead, dwWritten;
CHAR chBuf[BUFSIZE];
BOOL bSuccess = FALSE;
HANDLE hParentStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
int i;
for (i = 0; i < 4; i++)
{
/*DWORD dwAvail = 0;
if (!PeekNamedPipe(g_hChildStd_OUT_Rd, NULL, 0, NULL, &dwAvail, NULL)) {
// error, the child process might have ended
break;
}
if (!dwAvail) {
// no data available in the pipe
break;
}*/
bSuccess = ReadFile(g_hChildStd_OUT_Rd, chBuf, BUFSIZE, &dwRead, NULL);
if (!bSuccess || dwRead == 0) break;
/*bSuccess = WriteFile(hParentStdOut, chBuf, dwRead, &dwWritten, NULL);
if (!bSuccess) break;*/
chBuf[dwRead] = '\0';
printf("%i - %s\n", i, chBuf);
}
printf("done\n");
}
#包括
#包括
#包括
#包括
#定义BUFSIZE 4096
句柄g_hChildStd_IN_Rd=NULL;
句柄g_hChildStd_IN_Wr=NULL;
HANDLE g_hChildStd_OUT_Rd=NULL;
句柄g_hChildStd_OUT_Wr=NULL;
HANDLE g_hInputFile=NULL;
void-CreateChildProcess(void);
无效写入管道(字符*Arg1);
管道中的空隙读数(空隙);
无效错误退出(PTSTR);
int_tmain(int argc,TCHAR*argv[])
{
安全属性saAttr;
printf(“\n->开始父执行。\n”);
//设置bInheritHandle标志,以便继承管道句柄。
saAttr.nLength=sizeof(安全属性);
saAttr.bInheritHandle=TRUE;
saAttr.lpSecurityDescriptor=NULL;
//为子进程的标准输出创建管道。
如果(!CreatePipe(&g_-hchildsd_-OUT_-Rd,&g_-hchildsd_-OUT_-Wr,&saAttr,0))
ErrorExit(文本(“StdoutRd CreatePipe”);
//确保未继承STDOUT管道的读取句柄。
if(!SetHandleInformation(g_hchildsd_OUT_Rd,HANDLE_FLAG_INHERIT,0))
ErrorExit(文本(“标准输出设置句柄信息”);
//为子进程的STDIN创建管道。
如果(!CreatePipe(&g_hChildStd_IN_Rd,&g_hChildStd_IN_Wr,&saAttr,0))
ErrorExit(文本(“stdincreatepipe”);
//确保未继承STDIN管道的写入句柄。
if(!SetHandleInformation(g_hchildsd_IN_Wr,HANDLE_FLAG_INHERIT,0))
ErrorExit(文本(“标准输入设置句柄信息”);
//创建子进程。
CreateChildProcess();
//获取父级输入文件的句柄。
//此示例假定为纯文本文件,并使用字符串输出来验证数据流。
/*如果(argc==1)
ErrorExit(文本(“请指定输入文件。\n”);
g_hInputFile=CreateFile(
argv[1],,
泛读,
0,
无效的
开放式,
文件\属性\只读,
无效);
if(g\u hInputFile==无效的\u句柄\u值)
错误退出(文本(“创建文件”)*/
//写入作为子进程标准输入的管道。
//数据被写入管道的缓冲区,因此无需等待
//直到子进程运行后,才能写入数据。
//从作为子进程标准输出的管道中读取。
ReadFromPipe();
WriteToPipe(“ipconfig”);
//这就是死锁发生的地方,从这里开始
//程序变得无响应-如何修复此问题?
ReadFromPipe();
printf(“\n->父执行结束。\n”);
//此进程终止时,剩余的打开句柄将被清除。
//为了避免大型应用程序中的资源泄漏,请显式关闭句柄。
返回0;
}
void CreateChildProcess()
//创建一个子进程,该子进程使用先前为STDIN和STDOUT创建的管道。
{
TCHAR szCmdline[]=文本(“cmd.exe/k”);
处理信息piProcInfo;
STARTUPINFO-siStartInfo;
BOOL bsucces=假;
//设置流程信息结构的成员。
零内存(&piProcInfo,sizeof(进程信息));
//设置STARTUPINFO结构的成员。
//此结构指定重定向的STDIN和STDOUT句柄。
ZeroMemory(&siStartInfo,sizeof(STARTUPINFO));
siStartInfo.cb=sizeof(STARTUPINFO);
siStartInfo.hStdError=g_hchildsd_OUT_Wr;
siStartInfo.hStdOutput=g_hchildsd_OUT_Wr;
siStartInfo.hStdInput=g_hChildStd_IN_Rd;
siStartInfo.dwFlags |=STARTF_USESTDHANDLES;
//创建子进程。
bSuccess=CreateProcess(空,
“cmd.exe”,//命令行
NULL,//进程安全属性
NULL,//主线程安全属性
TRUE,//句柄被继承
0,//创建标志
NULL,//使用父环境
NULL,//使用父级的当前目录
&siStartInfo,//STARTUPINFO指针
&piProcInfo);//接收进程信息
//如果发生错误,请退出应用程序。
如果(!b成功)
ErrorExit(文本(“CreateProcess”);
其他的
{
//关闭子进程及其主线程的句柄。
//某些应用程序可能保留这些句柄以监视状态
//例如,子进程的。
CloseHandle(piProcInfo.hProcess);
CloseHandle(piProcInfo.hThread);
}
}
void WriteToPipe(char*命令)
//从文件中读取并将其内容写入孩子的STDIN的管道。
//没有更多数据时停止。
{
德沃德·德雷德,德沃德·书面;
CHAR chBuf[BUFSIZE];
BOOL bsucces=假;
bSuccess=WriteFile(g_hChildStd_IN_Wr,Command,strlen(Command),&dwwrited,NULL);
if(bSuccess==FALSE)
printf(“写入失败\n”);
printf(“writed=%i\n”,dwwrited);
//对于(;;)
//{
//bSuccess=ReadFile(g_hInputFile,chBuf,BUFSIZE,&dwRead,NULL);
//如果(!bsucces | | dwRead==0)中断;
//bSuccess=WriteFile(g_hChildStd_IN_Wr,Command,strlen(Command),&dwwrited,NULL);
//if(bSuccess==FALSE)
//printf(“写入失败\n”);
//printf(“writed=%i\n”,dwwrited);
//}
//关闭管道句柄,使子进程停止读取。
//如果(!CloseHandle(g_hChildStd_IN_Wr))
//ErrorExit(文本(“StdInWr CloseHandle”);
}
void ReadFromPipe(void)
//从子进程的管道读取标准输出
/和写入PAR
#define _XP_SUPPORT_
struct IO_COUNT
{
HANDLE _hFile;
HANDLE _hEvent;
LONG _dwIoCount;
IO_COUNT()
{
_dwIoCount = 1;
_hEvent = 0;
}
~IO_COUNT()
{
if (_hEvent)
{
CloseHandle(_hEvent);
}
}
ULONG Create(HANDLE hFile);
void BeginIo()
{
InterlockedIncrement(&_dwIoCount);
}
void EndIo()
{
if (!InterlockedDecrement(&_dwIoCount))
{
SetEvent(_hEvent);
}
}
void Wait()
{
WaitForSingleObject(_hEvent, INFINITE);
}
};
struct U_IRP : OVERLAPPED
{
enum { read, write };
IO_COUNT* _pIoObject;
ULONG _code;
LONG _dwRef;
char _buffer[256];
void AddRef()
{
InterlockedIncrement(&_dwRef);
}
void Release()
{
if (!InterlockedDecrement(&_dwRef)) delete this;
}
U_IRP(IO_COUNT* pIoObject) : _pIoObject(pIoObject)
{
_dwRef = 1;
pIoObject->BeginIo();
RtlZeroMemory(static_cast<OVERLAPPED*>(this), sizeof(OVERLAPPED));
}
~U_IRP()
{
_pIoObject->EndIo();
}
ULONG CheckIoResult(BOOL fOk)
{
if (fOk)
{
#ifndef _XP_SUPPORT_
OnIoComplete(NOERROR, InternalHigh);
#endif
return NOERROR;
}
ULONG dwErrorCode = GetLastError();
if (dwErrorCode != ERROR_IO_PENDING)
{
OnIoComplete(dwErrorCode, 0);
}
return dwErrorCode;
}
ULONG Read()
{
_code = read;
AddRef();
return CheckIoResult(ReadFile(_pIoObject->_hFile, _buffer, sizeof(_buffer), 0, this));
}
ULONG Write(const void* pvBuffer, ULONG cbBuffer)
{
_code = write;
AddRef();
return CheckIoResult(WriteFile(_pIoObject->_hFile, pvBuffer, cbBuffer, 0, this));
}
VOID OnIoComplete(DWORD dwErrorCode, DWORD_PTR dwNumberOfBytesTransfered)
{
switch (_code)
{
case read:
if (dwErrorCode == NOERROR)
{
if (dwNumberOfBytesTransfered)
{
if (int cchWideChar = MultiByteToWideChar(CP_OEMCP, 0, _buffer, (ULONG)dwNumberOfBytesTransfered, 0, 0))
{
PWSTR wz = (PWSTR)alloca(cchWideChar * sizeof(WCHAR));
if (MultiByteToWideChar(CP_OEMCP, 0, _buffer, (ULONG)dwNumberOfBytesTransfered, wz, cchWideChar))
{
if (int cbMultiByte = WideCharToMultiByte(CP_ACP, 0, wz, cchWideChar, 0, 0, 0, 0))
{
PSTR sz = (PSTR)alloca(cbMultiByte);
if (WideCharToMultiByte(CP_ACP, 0, wz, cchWideChar, sz, cbMultiByte, 0, 0))
{
DbgPrint("%.*s", cbMultiByte, sz);
}
}
}
}
}
Read();
}
break;
case write:
break;
default:
__debugbreak();
}
Release();
if (dwErrorCode)
{
DbgPrint("[%u]: error=%u\n", _code, dwErrorCode);
}
}
static VOID WINAPI _OnIoComplete(
DWORD dwErrorCode,
DWORD_PTR dwNumberOfBytesTransfered,
LPOVERLAPPED lpOverlapped
)
{
static_cast<U_IRP*>(lpOverlapped)->OnIoComplete(RtlNtStatusToDosError(dwErrorCode), dwNumberOfBytesTransfered);
}
};
ULONG IO_COUNT::Create(HANDLE hFile)
{
_hFile = hFile;
// error in declaration LPOVERLAPPED_COMPLETION_ROUTINE :
// second parameter must be DWORD_PTR but not DWORD
return BindIoCompletionCallback(hFile, (LPOVERLAPPED_COMPLETION_ROUTINE)U_IRP::_OnIoComplete, 0) &&
#ifndef _XP_SUPPORT_
SetFileCompletionNotificationModes(hFile, FILE_SKIP_COMPLETION_PORT_ON_SUCCESS) &&
#endif
(_hEvent = CreateEvent(0, TRUE, FALSE, 0)) ? NOERROR : GetLastError();
}
void ChildTest()
{
static const WCHAR name[] = L"\\\\?\\pipe\\somename";
HANDLE hFile = CreateNamedPipeW(name,
PIPE_ACCESS_DUPLEX|FILE_READ_DATA|FILE_WRITE_DATA|FILE_FLAG_OVERLAPPED,
PIPE_TYPE_BYTE|PIPE_READMODE_BYTE, 1, 0, 0, 0, 0);
if (hFile != INVALID_HANDLE_VALUE)
{
IO_COUNT obj;
if (obj.Create(hFile) == NOERROR)
{
BOOL fOk = FALSE;
SECURITY_ATTRIBUTES sa = { sizeof(sa), 0, TRUE };
STARTUPINFOW si = { sizeof(si) };
PROCESS_INFORMATION pi;
si.dwFlags = STARTF_USESTDHANDLES;
si.hStdError = CreateFileW(name, FILE_GENERIC_READ|FILE_GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE, &sa, OPEN_EXISTING, 0, 0);
if (si.hStdError != INVALID_HANDLE_VALUE)
{
si.hStdInput = si.hStdOutput = si.hStdError;
WCHAR ApplicationName[MAX_PATH];
if (GetEnvironmentVariableW(L"ComSpec", ApplicationName, RTL_NUMBER_OF(ApplicationName)))
{
if (CreateProcessW(ApplicationName, 0, 0, 0, TRUE, 0, 0, 0, &si, &pi))
{
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
fOk = TRUE;
}
}
CloseHandle(si.hStdError);
}
if (fOk)
{
STATIC_ASTRING(help_and_exit, "help\r\nexit\r\n");
U_IRP* p;
if (p = new U_IRP(&obj))
{
p->Read();
p->Release();
}
obj.EndIo();
//++ simulate user commands
static PCSTR commands[] = { "help\r\n", "ver\r\n", "dir\r\n", "exit\r\n" };
ULONG n = RTL_NUMBER_OF(commands);
PCSTR* psz = commands;
do
{
if (MessageBoxW(0,0, L"force close ?", MB_YESNO) == IDYES)
{
DisconnectNamedPipe(hFile);
break;
}
if (p = new U_IRP(&obj))
{
PCSTR command = *psz++;
p->Write(command, (ULONG)strlen(command) * sizeof(CHAR));
p->Release();
}
} while (--n);
//--
obj.Wait();
}
}
CloseHandle(hFile);
}
}