我在codeproject上找到了一些允许用户模拟的示例代码.
此代码通过导入以下非托管Win32 API函数来工作:
[DllImport("advapi32.dll", SetLastError = true)]
private static extern int LogonUser(
string lpszUserName,
string lpszDomain,
string lpszPassword,
int dwLogonType,
int dwLogonProvider,
ref IntPtr phToken);
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern int DuplicateToken(IntPtr hToken,int impersonationLevel,ref IntPtr hNewToken);
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool RevertToSelf();
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
private static extern bool CloseHandle(IntPtr handle);
这些函数用于模拟目标用户,然后执行某些操作,然后还原模拟上下文.冒充用户是这样实现的:
if ( LogonUser(userName, domainName, password, LOGON32_LOGON_INTERACTIVE,LOGON32_PROVIDER_DEFAULT, ref token ) != 0 )
{
if …我正在尝试将用户输入的参数传递给execvp().
到目前为止,我已经拆分了字符串.如果用户键入ls -a,temp则保存为"ls"和"-a",后跟NULL字符.我不太确定如何恰当地指出这一点execvp.在我看到它使用的例子中execvp(temp[position], temp).我知道我现在尝试这样做的方式是错误的,但我不确定如何正确地做到这一点!目前我遇到了分段错误.
int main(int argc, char *argv[])
{
char line[124];
int size = 124;
char *temp = NULL;
while(fgets(line, size, stdin) != NULL ) {
if (strcmp(line, "exit\n") == 0) {
exit(EXIT_SUCCESS);
}
temp = strtok(line, " ");
while (temp != NULL) {
printf("%s\n", temp);
temp = strtok(NULL, " ");
}
execvp(temp, &temp);
}
return EXIT_SUCCESS;
}
我正在尝试使用ruby on rails和postgres设置我的VPS(CentOS 6.4).
我安装了ruby(2.1.0p0),rails(4.1.0)和postgresql(9.3.4)没有问题.
当我尝试创建新的rails应用程序(rails new new_app -d postgresql)时,它会在安装pg gem时停止.我查看了有关此错误的所有SO帖子,并尝试了我能找到的所有内容.最建议的是运行"yum install postgresql-devel"并仍然无法正常工作.
您可以在下面找到ssh输出和mkmf.log.如果需要更多信息,请告诉我......
Building native extensions. This could take a while... ERROR: Error installing pg: ERROR: Failed to build gem native extension. /home/deploy/.rvm/rubies/ruby-2.1.0/bin/ruby extconf.rb checking for pg_config... yes Using config values from /usr/bin/pg_config checking for libpq-fe.h... *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided …
在下面的代码中,我原本期望调用a.Generate(v)会导致调用V.Visit(A a),因为当调用Generate是this类型A.Hoewever时,它看起来this像是一个Inter代替.
是否有可能具有不明确地执行(相同)的方法在两个预期的行为A和B与仅在共享基类？如果是这样,怎么能实现呢？
using System;
using System.Diagnostics;
namespace Test {
class Base {}
class Inter: Base {
public virtual void Generate(V v) {
// `Visit(Base b)` and not `Visit(A a)` is called when calling
// A.Generate(v). Why?
v.Visit(this);
}
}
class A: Inter {}
class B: Inter {}
class V {
public void Visit(Base b) { throw new NotSupportedException(); }
public void Visit(A a) { Trace.WriteLine("a"); …我有兴趣在index.Rmd文件中为不同的幻灯片使用不同的布局.复制此处和下面提供的模板后,我在我的assets/layouts文件夹中创建了一个.html文件.
<slide class="{{ class }}" id="{{ id }}">
<hgroup>
{{{ header }}}
</hgroup>
<article>
<hr noshade size=4 color='red'>
{{{ content }}}
<div class='left' style='float:left;width:48%'>
{{{ left }}}
</div>
<div class='right' style='float:right;width:48%'>
{{{ right }}}
</div>
</article>
</slide>
到目前为止,仍然不清楚:
1)为什么我牌组中的幻灯片是空白的,并且没有显示以下任何内容:
---
#testing
hello
*** left
- point a
- point b
- point c
*** right
- point a
- point b
- point c
2)如何从我的资产文件夹中为单个幻灯片而不是整个卡组"调用"自定义布局
我的代码有一个ostream由各种模块累积并最终显示到控制台的对象.我也想将这个ostream对象写入一个文件,但我是否必须使用一个ofstream对象重写所有代码,或者有一种方法可以将一个转换为另一个(可能通过stringstream？)
例如,我现有的许多功能都是这样的
ostream& ClassObject::output(ostream& os) const
{
os << "Details";
return os;
}
我可以用ofstream对象作为参数调用此函数,并让该ofstream对象累积信息吗？
我正在尝试使用Json.NET处理JSON结构并遇到一些问题:
当JSON包含未命名的数组时,我的类不起作用.
Json示例:
{
"graph_property" : [{
"name" : "calculation_method",
"value" : "Arithmetic"
}, {
"name" : "graph_type",
"value" : "TIME"
}
],
"measurement" : [{
"id" : "9997666",
"alias" : "Measurement (TxP)[IE]-Home Page - Total Time (seconds)",
"bucket_data" : [{
"name" : "2013-MAR-18 12:00 AM",
"id" : 1,
"perf_data" : {
"value" : "2.244",
"unit" : "seconds"
},
"avail_data" : {
"value" : "99.67",
"unit" : "percent"
},
"data_count" : {
"value" : "299",
"unit" : "#"
}
} …我试图在C中实现一个简单的客户端和服务器,我无法在网上找到如何为客户端设置特定IP地址的示例.这是我到目前为止所得到的:
sockfd = socket(PF_INET, SOCK_STREAM, 0);
if (sockfd == -1)
{
<some code to handle error>
}
address.sin_family = AF_INET;
address.sin_addr.s_addr = inet_addr(<addressOfTheServer>);
address.sin_port = htons(<portToConnectToServer>);
len = sizeof(address);
int result = connect(sockfd, (struct sockaddr *)&address, len);
在服务器端,我检查客户端IP地址,我总是得到127.0.0.1
我想改变一些不同的东西.
我正在学习C++.我在格式化程序输出时遇到问题.我想打印完全对齐的列,但到目前为止我不能这样做,这是我的代码:
int main()
{
employee employees[5];
employees[0].setEmployee("Stone", 35.75, 053);
employees[1].setEmployee("Rubble", 12, 163);
employees[2].setEmployee("Flintstone", 15.75, 97);
employees[3].setEmployee("Pebble", 10.25, 104);
employees[4].setEmployee("Rockwall", 22.75, 15);
printEmployees(employees, 5);
return 0;
}
// print the employees in my array
void printEmployees(employee employees[], int number)
{
int i;
for (i=0; i<number; i++) {
employees[i].printEmployee();// this is the method that give me problems
}
cout << "\n";
}
在班级员工中我有print员工方法:
void printEmployee() const
{
cout << fixed;
cout << surname << setw(10) << empNumber << "\t" << setw(4) << …我有一个SignalR和Ext.net的项目.两者都需要Newtonsoft.Json.
SignalR需要Newtonsoft.Json 4.5.0.0,Ext.net需要4.0.8.0.
我的绑定重定向根本不起作用.在我的web.config中
<dependentAssembly>
<assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral"/>
<bindingRedirect oldVersion="4.0.8.0" newVersion="4.5.0.0"/>
</dependentAssembly>
但是当它结束时
=== Pre-bind state information === LOG: DisplayName = Newtonsoft.Json, Version=4.0.8.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed (Fully-specified) LOG: Appbase = file:///C:/Users/*****/Documents/Visual Studio 2012/Projects/QuotaBuilder/branches/1Install/QMSSite/ LOG: Initial PrivatePath = C:\Users\*****\Documents\Visual Studio 2012\Projects\QuotaBuilder\branches\1Install\QMSSite\bin Calling assembly : Ext.Net, Version=1.6.0.1867, Culture=neutral, PublicKeyToken=2e12ce3d0176cd87. === LOG: This bind starts in default load context. LOG: Using application configuration file: C:\Users\*****\Documents\Visual Studio 2012\Projects\QuotaBuilder\branches\1Install\QMSSite\web.config LOG: Using host configuration file: \\pacrl-fsrv02\userdata$\*****\My Documents\IISExpress\config\aspnet.config LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config. LOG: Post-policy …