常用代碼片段[待補充]

讀取檔案進行解析處理

//解析調試的資料（測試）
void  testParaData()
{
	//讀取檔案
	FILE *stream;
	if ((stream = fopen("./FrameInfo.txt", "rb")) == NULL)
	{
		WirteLogLocal("Cannot open output file.\n");
	}

	MicsIPCStreamKey key;
	key.iStreamType = 0;
	char mzCode[] = "33059151001320300016";
	memcpy(key.szCamCode, mzCode, sizeof(mzCode));

	int dataLen = 0;
	int ret = 0;

	//解析資料
	while (true)
	{
		ret = fread(&dataLen, 1, 4, stream);
		if (ret != 4)
		{
			break;
		}

		char* pVideoData = new char[dataLen];
		ret = fread(pVideoData, 1, dataLen, stream);
		if (ret < dataLen)
		{
			break;
		}


		GetStreamCallBack(122, 0, pVideoData, dataLen, (void*)(&key));

		delete pVideoData;
	}

	fclose(stream);
}
           

• IP數字與點分十進制轉換

//點分十進制轉數字
inet_addr("192.168.1.10")

//數字轉點分十進制
sockaddr_in devAddr = {};
memcpy(&(devAddr.sin_addr.S_un), &dwIP, sizeof(DWORD));
std::string  strIP = std::string("IP=") + inet_ntoa(devAddr.sin_addr) + std::string("\n");
           

• Windows 程式已打開判斷

#include <Psapi.h>
#pragma comment ( lib, "Psapi.lib" )

#define APP_MUTEX _T("XXXXX")

HANDLE hAppMutex = CreateMutex(NULL, TRUE, APP_MUTEX);
if (GetLastError() == ERROR_ALREADY_EXISTS)
{
	CloseHandle(hAppMutex);
	hAppMutex = NULL;
	//MessageBox(_T("The program has been running!"));
	exit(0);
}
           

• 輸出資訊到檔案

#include <string>
#include <fstream>

void WriteLog(std::string logata)
{
	std::ofstream fout;
	fout.open("./log.txt", std::ios::binary | std::ios::app);
	if (!fout)
	{
		return;
	}

	fout << logata;
	fout.close();
}
           

• 寫入檔案

void WriteFile(std::string data)
{
	FILE *stream = NULL;
	if ((stream = fopen("./log.txt", "wb+")) == NULL)
	{
		return;
	}
	
	fwrite(data.c_str(), data.size(), 1, stream);
	fclose(stream);
}
           

• 字元分割
• 參考：https://www.jianshu.com/p/5876a9f49413

std::vector<std::string> strSplit(const std::string &str, const std::string &pattern)
{
	std::vector<std::string> res;
	if (str == "")
		return res;
	//在字元串末尾也加入分隔符，友善截取最後一段
	std::string strs = str + pattern;
	size_t pos = strs.find(pattern);

	while (pos != strs.npos)
	{
		std::string temp = strs.substr(0, pos);
		res.push_back(temp);
		//去掉已分割的字元串,在剩下的字元串中進行分割
		strs = strs.substr(pos + 1, strs.size());
		pos = strs.find(pattern);
	}

	return res;
}
           

• 擷取exe執行全路徑名稱

void  getResourcePath(HINSTANCE hInstance, char pPath[1024])
{
	char    szPathName[1024];
	char    szDriver[64];
	char    szPath[1024];
	GetModuleFileNameA(hInstance, szPathName, sizeof(szPathName));
	_splitpath(szPathName, szDriver, szPath, 0, 0);
	sprintf(pPath, "%s%s", szDriver, szPath);
}

//使用：
char    szPath[1024];
getResourcePath(0,szPath);