CreateProcess执行cmd指令 执行结果返回错误码87的可能原因

这是犯蠢的结果，这里踩了个坑

在createprocess的cmdline参数上构造的字符串前有一个空格，createprocess一直失败，偏偏我拷贝过来的其他指令都可以成功执行，我花了两个小时才找到我粘贴过来的cmd命令字符串最前面有一个空格，这个空格看的我想哭。不吐槽了上源码：

1、构造cmd指令

char chCmd[512] = {0};
    char chRet[1024] = {0};
    int nRet = 0;

//错误示例

//sprintf_s(chCmd, sizeof(chCmd), " auditpol /set /subcategory:\"进程创建\" /success:enable "); 

sprintf_s(chCmd, sizeof(chCmd), "auditpol /set /subcategory:\"进程创建\" /success:enable");
     nRet= ExecuteCmd(chCmd, chRet, sizeof(chRet) - 1);

2、执行cmd指令函数的源码

int	CSmallTestDlg::ExecuteCmd(const CString &csCmd, char *pszRet, int nRetMaxSize/* = 102400*/)
{  



	if (csCmd.IsEmpty() || (NULL == pszRet) || (nRetMaxSize < 0))
	{
		return -1;
	}

	SECURITY_ATTRIBUTES sa = {0};  
	HANDLE hRead = NULL, hWrite = NULL;  

	sa.nLength = sizeof(SECURITY_ATTRIBUTES);  
	sa.lpSecurityDescriptor = NULL;  
	sa.bInheritHandle = TRUE;  
	if (! CreatePipe(&hRead,&hWrite,&sa,0))  
	{
		return -2;  
	}

	STARTUPINFO si={sizeof(si)};  
	PROCESS_INFORMATION pi;  
	si.hStdError = hWrite;  
	si.hStdOutput = hWrite;  
	si.wShowWindow = SW_HIDE;  
	si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;  
	TCHAR* cmdline=(char *)(const char *)csCmd;
	if (!CreateProcess(NULL,cmdline,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))  
	//if(CreateProcessAsUser(hToken,NULL,cmdline,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))
	{
		CloseHandle(hWrite);  
		CloseHandle(hRead);  
		return -3;  
	}
	CloseHandle(hWrite);  

	int nIndex = 0;
	DWORD byteRead = 0;  
	while(true)  
	{
		if (! ReadFile(hRead, pszRet + nIndex, nRetMaxSize - 1,&byteRead,NULL))  
		{
			break;  
		}
		nIndex += byteRead; 
	}
	CloseHandle(hRead);  

	return nIndex;  
}