2017 年 12 月 – Jeff Notes

ASP.NET MVC在Controller中，把JsonResult转为JSON字符串

string json = new System.Web.Script.Serialization.JavaScriptSerializer().Serialize(jsonResult.Data);
Response.Write(json);

使用System.IO.File.Create(path);创建的文件如何关闭

FileStream fs =  System.IO.File.Create(path);
fs.Close();

Qt发布程序

使用下面的命令查看Hello.exe所依赖的DLL:

windeployqt Hello.exe

如果还有缺少的DLL，可以根据报错提示用 Everything 工具进行查找，然后放进程序目录就行了。

qt quick 的程序要这样发布

-qmldir 后面是qt的qml目录

 windeployqt daolan.exe -qmldir "D:\Qt\Qt5.8.0\5.8\mingw53_32\qml"

VC HttpClient

一个 VC++ 中使用的 HttpClient 类，可以进行HTTP GET和POST，代码如下：

HttpClient.h

#pragma once
#include <string>
#include <vector>
using namespace std;

class CHttpClient
{
public:
	CHttpClient(void);
	~CHttpClient(void);

	BOOL Get(LPCSTR url, string &result);
};

HttpClient.cpp

#include "stdafx.h"
#include "HttpClient.h"
#include <wininet.h>   
#pragma comment(lib, "wininet.lib") 


CHttpClient::CHttpClient(void)
{
}

CHttpClient::~CHttpClient(void)
{
}


BOOL CHttpClient::Get(LPCSTR url, string &result)
{
	result.clear();

	vector<char> v; 
	const CHAR * szUrl = url; 
	CHAR szAgent[] = ""; 
	HINTERNET hInternet1 =  
		InternetOpen(NULL,INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,NULL); 
	if (NULL == hInternet1) 
	{ 
		InternetCloseHandle(hInternet1); 
		return FALSE; 
	} 
	HINTERNET hInternet2 =  
		InternetOpenUrl(hInternet1,szUrl,NULL,NULL,INTERNET_FLAG_NO_CACHE_WRITE,NULL); 
	if (NULL == hInternet2) 
	{ 
		InternetCloseHandle(hInternet2); 
		InternetCloseHandle(hInternet1); 
		return FALSE; 
	} 
	DWORD dwMaxDataLength = 500; 
	PBYTE pBuf = (PBYTE)malloc(dwMaxDataLength*sizeof(TCHAR)); 
	if (NULL == pBuf) 
	{ 
		InternetCloseHandle(hInternet2); 
		InternetCloseHandle(hInternet1); 
		return FALSE; 
	} 
	DWORD dwReadDataLength = NULL; 
	BOOL bRet = TRUE; 
	do  
	{ 
		ZeroMemory(pBuf,dwMaxDataLength*sizeof(TCHAR)); 
		bRet = InternetReadFile(hInternet2,pBuf,dwMaxDataLength,&dwReadDataLength); 
		for (DWORD dw = 0;dw < dwReadDataLength;dw++) 
		{ 
			v.push_back(pBuf[dw]); 
		} 
	} while (NULL != dwReadDataLength); 

	vector<char>::iterator i; 
	for(i=v.begin(); i!=v.end(); i++) 
		result += *i;

	return TRUE;
}

ProcessStartInfo 一定要写全路径

ProcessStartInfo 一定要写全路径，不然会出现一些莫明其妙的错误，比如开机自动启动时打不开。

ProcessStartInfo p1 = new ProcessStartInfo($"{Application.StartupPath}\\PD101AHelper.exe", $"{address} \"{windowShowMsg.Trim()}\"  \"{zhShowMsg2 ?? ""}\"");

p1.WindowStyle = ProcessWindowStyle.Hidden;
Process.Start(p1);