c++ - Map char pointer to in-memory file with file descriptor -

-

I try to map a four * with in-memory FILE * with fmemopen I just found out that Phamopen will not give me a file descriptor, is there any way to get an in-memory file with FD?

Four * Data = ... Data ...; FILE * fid = fmemopen (data, 172, "r"); Int fd = fileno (fid); If (FD & lt; 0) std :: cout & lt; & Lt; "BAD" & lt; & Lt; Std :: endl; Else std :: cout & lt; & Lt; "Good" & lt; & Lt; Std :: endl;

Take a look and see that in shm_open () What does the combination with fdopen () 

  #include & lt; Stdio.h & gt; # Include & lt; Sys / mman.h & gt; # Include & lt; Sys / stat.h & gt; # Include & lt; Fcntl.h & gt; Int main () {FILE * f = NULL; Int fd = 0, n = 0; Four buffer [6] = "hello"; Fd = shm_open ("myfile", O_CREAT | O_RDWR, S_IRUSR | S_IWUSR); If (FD & lt; 0) {printf ("failed in shm_open \ n"); Exit (1); } F = fdopen (fd, "w +"); If (! F) {printf ("Failed to do FDOpin \ n"); Exit (1); } N = fwrite (buffer, size), size (buffer), f); Printf ("write% d bytes", n); Fclose (f); }

Comments

Post a Comment

Popular posts from this blog

import - Python ImportError: No module named wmi -

-
I followed the instructions for downloading WMI for Python When I try to run the code for C.Win32_Service (StartMode = "Auto", state = "Stopped") import wmi c = wmi.WMI (): if Raw_input ("restart% s?"% S.Caption) .upper () == "Y": s.StartService () I got the error < Code> traceback (most recent call end): file ". \", Line 1, edit: I am using Python 2.7.6 EDIT2: I am running 64-bit Windows 2008 R2, and I've downloaded WMI-1.4.9.zip (md5). I removed the content and put it in D: Python \ Tools \ Scripts I executed dragon setup.py.install I said D : \ Python \ tools \ scripts to% PATH% and when I execute the code for C.Win32_Service (StartMode = "Auto", state = "Stopped") import wmi c = Wmi.WMI (): If raw_input ("Restart% s?"% S. Caption). () == "Y": s.StartService () error me Gets traceback (most recent call final): File ". See \", line 1, &
Read more

Editing Python Class in Shell and SQLAlchemy -

-
I am working on the terminal on a shell script after this tutorial SQLAlchemy tutorial. I need to type gt; & Gt; & Gt; Sqlalchemy import column, integer, string & gt; & Gt; & Gt; Class user (base): __tablename__ = 'users' id = column (integer, primary_key = true) name = column (string) absolute name = column (string) password = column (string) def __repr __ (self): return "& lt ; User (name = '% s', absolute name = '% s', password = '% s') & gt; "% (Self.name, self.fullname, self.password) After the problem I have typed the password = column (string) I hit twice and changed .... >> I then took everything back but then an error was thrown because the class already exists ... I am not completely sure how to fix it. How do I open that slip in the shell script and edit it (Add DF to DRR) The error thrown below: / user / giripeters / TFSQLLX / Lib / python2.7 / site-packages / sqlalchemy / ext / decla
Read more

c# - MySQL Parameterized Select Query joining tables issue -

-
I am using parameterized select questions in conjunction with my program and it works entirely, When I try to join the table Everything I have done is a small fraction: using (MySqlCommand cmd = new MySqlCommand (paramQuery) ToSql (), Connection)) /etc/ paramQuery.ToSql () Equal: "Select TableOne ID, Tableon, Department, Tablet. One by name table, Table 2 h Yes TableOnEID = @Pharmak "* / for (Int Index = 0; Index and Lt; ParamariX Parameter (.c calculation; Index ++) Cmd.Parameters.AddWithValue (paramQuery.Parameters (). ElementAt (index). , ParamQuery.Parameters (). ElementAt (index) .Value); / * ParamQuery.Parameters (). ElementAt (index) .k = "@most 0" paramQuery.Parameters (). ElementAt (index) .Value = "tableTwo.ID" * / MySqlDataReader Reader = cmd.ExecuteReader (); While (reader.Read ()) {// do stuff} } One of the tables I attempt to join is For the table, two with the same id for all. Is there something that I'm doing wrong?
Read more