老吴编程笔记

月度归档： 2016 年 4 月

  • asp.net core显示环境信息

    在razor中添加如下代码，即可在页面显示服务器的环境信息。

    @inject Microsoft.Extensions.PlatformAbstractions.IRuntimeEnvironment env
<html>
    <body>
        <img src="images/ASP-NET-Banners-01.png" />
        @("Hello World")
        <footer>
            <div class="container text-center">
                &copy;@DateTime.Now.Year  <a href="http://www.lwbj.cn">老吴笔记</a> Powered by @($"dotnet-{env.RuntimeType.ToLower()}-{env.RuntimeVersion} on {env.OperatingSystem}")
            </div>
        </footer>
    </body>
</html>

  • tar打包目录

    tar打包目录

    打包 tar -czf default.tar.gz default

    解压 tar -xvf xxx.tar.gz

  • VC获取程序所在的目录

    VC获取程序所在的目录

    CString  GetCurDir()
{
                 char   sDrive[_MAX_DRIVE ];
                 char   sDir[_MAX_DIR ];
                 char   sFilename[_MAX_FNAME ], Filename[_MAX_FNAME];
                 char   sExt[_MAX_EXT ];
                 GetModuleFileName(AfxGetInstanceHandle(), Filename, _MAX_PATH);
                 _tsplitpath(Filename, sDrive, sDir, sFilename, sExt);
                 CString   homeDir(CString (sDrive) + CString(sDir));
                 int   nLen = homeDir.GetLength();

                 if (homeDir.GetAt(nLen - 1)!= '\\' )
                {
                                homeDir += '\\' ;
                }

                 return homeDir;
}

  • VC++获取控制台命令的输出结果

    VC++获取控制台命令的输出结果

    #include "stdafx.h"

#include <Windows.h>
#include <iostream>
#include <string>
using namespace std;

BOOL ExecDosCmd(string cmd, string &output)
{
    SECURITY_ATTRIBUTES sa;
    HANDLE hRead, hWrite;

    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = TRUE;
    if (!CreatePipe(&hRead, &hWrite, &sa, 0))
    {
        return FALSE;
    }
    char command[1024]; // 长达1K的命令行，够用了吧
    strcpy(command, "Cmd.exe /C ");
    strcat(command, cmd.c_str());
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    si.cb = sizeof(STARTUPINFO);
    GetStartupInfo(&si);
    si.hStdError = hWrite;  // 把创建进程的标准错误输出重定向到管道输入
    si.hStdOutput = hWrite; // 把创建进程的标准输出重定向到管道输入
    si.wShowWindow = SW_HIDE;
    si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    // 关键步骤，CreateProcess函数参数意义请查阅MSDN
    if (!CreateProcess(NULL, command, NULL, NULL, TRUE, NULL, NULL, NULL, &si, &pi))
    {
        CloseHandle(hWrite);
        CloseHandle(hRead);
        return FALSE;
    }
    CloseHandle(hWrite);

    char buffer[4096] = {0}; // 用4K的空间来存储输出的内容，只要不是显示文件内容，一般情况下是够用了。
    DWORD bytesRead;
    while (true)
    {
        if (ReadFile(hRead, buffer, 4095, &bytesRead, NULL) == NULL)
            break;
        // buffer中就是执行的结果，可以保存到文本，也可以直接输出
        // AfxMessageBox(buffer);   //这里是弹出对话框显示
        // cout << "----:" << endl << buffer << endl;
    }
    CloseHandle(hRead);

    output = buffer;
    return TRUE;
}

int main()
{
    string output;
    ExecDosCmd("wmic diskdrive get Caption,SerialNumber", output);
    cout << output << endl;
    return 0;
}

  • C++获取windows系统分区大小及使用情况

    Ｃ++使用Windows SDK获取系统分区大小以及使用情况，代码如下：

    // ConsoleApplication1.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"

#include <stdint.h>
#include <windows.h>
#include <iostream>
#include <string>

using namespace std;

void TestDrive()
{
    cout << "TestDrive" << endl;
    char* lpDrives = (char *)malloc(MAX_PATH * sizeof(char ));
    memset(lpDrives, 0, MAX_PATH * sizeof (char));

    DWORD dwLen = ::GetLogicalDriveStringsA(MAX_PATH, lpDrives);
    cout << "dwLen: " << dwLen << endl;

    DWORD driver_number = dwLen / 4;
    cout << "driver_number: " << driver_number << endl;

    string driver;
    LPTSTR start;
    for (DWORD nIndex = 0; nIndex < driver_number; nIndex++)
    {
        start = lpDrives + nIndex * 4;
        cout << "........................................." << endl;
        driver.append(start);
        cout << "lpDrives + nIndex * 4: " << lpDrives + nIndex * 4 << endl;
        cout << "DRIVE_REMOVABLE: " << DRIVE_REMOVABLE << endl;
        cout << "::GetDriveType(lpDrives + nIndex * 4): " << :: GetDriveType(lpDrives + nIndex * 4) << endl;
        if (::GetDriveType (start) == DRIVE_REMOVABLE)
        {
            driver.append(start);
            if (GetVolumeInformation (start, 0, 0, 0, 0, 0, 0, 0)) //判断驱动是否准备就绪
            {
                cout << "驱动准备就绪 " << endl;
            }
        }
        uint64_t lpFreeBytesAvailable = 0;
        uint64_t lpTotalNumberOfBytes = 0;
        uint64_t lpTotalNumberOfFreeBytes = 0;
        GetDiskFreeSpaceExA(lpDrives + nIndex * 4,
                            (PULARGE_INTEGER)&lpFreeBytesAvailable,
                            (PULARGE_INTEGER)&lpTotalNumberOfBytes,
                            (PULARGE_INTEGER)&lpTotalNumberOfFreeBytes);
        cout << "lpFreeBytesAvailable: " << lpFreeBytesAvailable << endl;
        cout << "lpTotalNumberOfBytes: " << lpTotalNumberOfBytes << endl;
        cout << "lpTotalNumberOfFreeBytes: " << lpTotalNumberOfFreeBytes << endl;
    }
    std::cout << "driver: " << driver << endl;
}

int main(int argc, char *argv[])
{
    TestDrive();
    return 0;
}