记录一个小项目中运用的知识点

1.在新的VS版本中，会对老的一些函数做安全验证，导致编译报错，解决方案

在该文件的最上方 加上 #define _CRT_SECURE_NO_WARNINGS

 

2.对于某个应用，不需要弹出黑窗口，而是在后台静默运行

修改链接的部分，或者在代码中 添加 #pragma comment( linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"" )

 

3.对于互斥量的使用，一个程序只允许在当前的机器上打开一次，不能同时打开两个

HANDLE m_hMutex = CreateMutex(NULL, FALSE, L"krs_process_keep");
    if (GetLastError() == ERROR_ALREADY_EXISTS)
    {
        CloseHandle(m_hMutex);
        m_hMutex = NULL;
        return 0;
    }

 

4.获取本地时间以宽字符的形式输出

	std::wstring strLocalTime;
	time_t nowtime;
	struct tm* p;
	time(&nowtime);
	p = localtime(&nowtime);
	TCHAR tmp[256];
	wcsftime(tmp, sizeof(tmp), L"%Y-%m-%d %H:%M:%S", p);
	strLocalTime = tmp;

这里的wcsftime 是专门用来格式化宽字符的函数

 

5.获取当前应用的所在目录和读取init文件(假设在该exe的目录下有一个user文件夹里面有一个setting.ini文件)

TCHAR szValue[MAX_PATH] = _T("");
	TCHAR szModulePath[MAX_PATH] = { 0 };
	ZeroMemory(szModulePath, MAX_PATH * sizeof(TCHAR));
	::GetModuleFileName(NULL, szModulePath, MAX_PATH);
	std::wstring strApp = szModulePath;
	int nPos = strApp.find_last_of(_T('\\'));
	strApp = strApp.substr(0, nPos + 1);

	std::wstring strPath = strApp + _T("user\\settings.ini");
	::GetPrivateProfileString(_T("Login"), _T("ServerAddr"), _T(""), szValue, MAX_PATH, strPath.c_str());
	std::wstring strAddr = szValue;

	::GetPrivateProfileString(_T("Login"), _T("Account"), _T(""), szValue, MAX_PATH, strPath.c_str());
	std::wstring strAccount = szValue;

	::GetPrivateProfileString(_T("Login"), _T("PassWord"), _T(""), szValue, MAX_PATH, strPath.c_str());
	std::wstring strPassWord = szValue;

	::GetPrivateProfileString(_T("Login"), _T("ServerPort"), _T(""), szValue, MAX_PATH, strPath.c_str());
	std::wstring strPort = szValue;

文件内容：

[Login]
ServerAddr=192.168.0.1
ServerPort=80
Account=JamesWu9527
PassWord=123456

 

6.将应用程序提权（提升至管理员权限）这个是网上摘取的 链接在注释中

// https://blog.csdn.net/csdn_zhangchunfeng/article/details/83751544
bool KrsTools::EnableDebugPrivilege()
{
	HANDLE hToken;
	LUID sedebugnameValue;
	TOKEN_PRIVILEGES tkp;
	if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) {
		return false;
	}
	if (!LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &sedebugnameValue)) {
		__try {
			if (hToken) {
				CloseHandle(hToken);
			}
		}
		__except (EXCEPTION_EXECUTE_HANDLER) {};
		return false;
	}
	tkp.PrivilegeCount = 1;
	tkp.Privileges[0].Luid = sedebugnameValue;
	tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
	if (!AdjustTokenPrivileges(hToken, FALSE, &tkp, sizeof(tkp), NULL, NULL)) {
		__try {
			if (hToken) {
				CloseHandle(hToken);
			}
		}
		__except (EXCEPTION_EXECUTE_HANDLER) {};
		return false;
	}
	return true;
}

 

7.通过应用名获取进程ID

DWORD KrsTools::GetProcessIdFromName(const char* processName)
{
	PROCESSENTRY32 pe;
	DWORD id = 0;

	HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
	pe.dwSize = sizeof(PROCESSENTRY32);
	if (!Process32First(hSnapshot, &pe))
		return 0;
	char pname[300];
	do
	{
		pe.dwSize = sizeof(PROCESSENTRY32);
		if (Process32Next(hSnapshot, &pe) == FALSE)
			break;
		sprintf(pname, "%ws", pe.szExeFile);
		if (strcmp(pname, processName) == 0)
		{
			id = pe.th32ProcessID;
			break;
		}

	} while (1);

	CloseHandle(hSnapshot);

	return id;
}

 

8.执行一个第三方程序（带参数）

void KrsTools::StartPrcess(std::wstring strProcessName,std::wstring strParam)
{
	TCHAR tszProcess[64] = { 0 };
	lstrcpy(tszProcess, strProcessName.c_str());
	//启动程序
	SHELLEXECUTEINFO shellInfo;
	memset(&shellInfo, 0, sizeof(SHELLEXECUTEINFO));
	shellInfo.cbSize = sizeof(SHELLEXECUTEINFO);
	shellInfo.fMask = NULL;
	shellInfo.hwnd = NULL;
	shellInfo.lpVerb = NULL;
	shellInfo.lpFile = tszProcess;                      // 执行的程序名(绝对路径)
	shellInfo.lpParameters = strParam.c_str();			// 执行程度的参数
	shellInfo.lpDirectory = NULL;
	shellInfo.nShow = NULL;
	shellInfo.hInstApp = NULL;
	ShellExecuteEx(&shellInfo);
}

 

9.HTTP访问

std::string KrsTools::HttpRequest(const TCHAR* lpHostName, const TCHAR* lpUrl,
	const TCHAR* lpMethod, short sPort, char* lpPostData, int nPostDataLen)
{
	HINTERNET hInternet = NULL, hConnect = NULL, hRequest = NULL;

	TCHAR headerContentType[] = L"Content-Type:application/x-www-form-urlencoded";
	TCHAR headAccept[] = L"Accept: application/json, text/plain, */*";
	DWORD dwLastError = 0;
	BOOL bRet;

	std::string strResponse;

	hInternet = (HINSTANCE)InternetOpen(L"User-Agent", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
	if (!hInternet)
	{
		std::cout << "InternetOpen user-agent failed" << std::endl;
		//CommonLog::getInstance()->WriteLog(LogLevel_debug, _T("InternetOpen user-agent failed"));
		goto end;
	}

	//hostname可以写www.baidu.com，不能写http://www.baidu.com,
	hConnect = (HINSTANCE)InternetConnect(hInternet, lpHostName, sPort, NULL, L"HTTP/1.1", INTERNET_SERVICE_HTTP, 0, 0);
	if (!hConnect)
	{
		std::cout << "InternetConnect failed" << std::endl;
		//CommonLog::getInstance()->WriteLog(LogLevel_debug, _T("InternetConnect failed"));
		goto end;
	}

	hRequest = (HINSTANCE)HttpOpenRequest(hConnect, lpMethod, lpUrl, L"HTTP/1.1", NULL, NULL, INTERNET_FLAG_RELOAD, 0);
	if (!hRequest)
	{
		std::cout << "HttpOpenRequest failed" << std::endl;
		//CommonLog::getInstance()->WriteLog(LogLevel_debug, _T("HttpOpenRequest failed"));
		goto end;
	}
	///header可以加其他的///
	//_tcslen(headerContentType)千万不要因为以前养成的好习惯而加上*sizeof(TCHAR),不然header中会有乱码，看起来是length表示的是utf-8的长度，不是占用的字节数
	//nginx可能会报400
	bRet = HttpAddRequestHeaders(hRequest, headerContentType, _tcslen(headerContentType), HTTP_ADDREQ_FLAG_REPLACE | HTTP_ADDREQ_FLAG_ADD);
	if (!bRet)
	{
		std::cout << "HttpAddRequestHeaders failed" << std::endl;
		//CommonLog::getInstance()->WriteLog(LogLevel_debug, _T("HttpAddRequestHeaders failed"));
		goto end;
	}

	bRet = HttpAddRequestHeaders(hRequest, headAccept, _tcslen(headAccept), HTTP_ADDREQ_FLAG_REPLACE | HTTP_ADDREQ_FLAG_ADD);
	if (!bRet)
	{
		std::cout << "HttpAddRequestHeaders2 failed" << std::endl;
		//CommonLog::getInstance()->WriteLog(LogLevel_debug, _T("HttpAddRequestHeaders2 failed"));
		goto end;
	}


	bRet = HttpSendRequest(hRequest, NULL, 0, lpPostData, nPostDataLen);
	dwLastError = GetLastError();

	while (TRUE)
	{
		char cReadBuffer[4096];
		unsigned long lNumberOfBytesRead;
		bRet = InternetReadFile(hRequest, cReadBuffer, sizeof(cReadBuffer) - 1, &lNumberOfBytesRead);
		if (!bRet || !lNumberOfBytesRead)
		{
			break;
		}
		cReadBuffer[lNumberOfBytesRead] = 0;
		strResponse = strResponse + cReadBuffer;
	}

end:
	if (hRequest)
		InternetCloseHandle(hRequest);
	if (hConnect)
		InternetCloseHandle(hConnect);
	if (hInternet)
		InternetCloseHandle(hInternet);

	return strResponse;
}

KrsTools::HttpRequest(strAddr.c_str(), strUrl.c_str(), L"get", _wtoi(strPort.c_str()));    

参数：服务器地址，参数，访问方式，端口号