本文共 4930 字，大约阅读时间需要 16 分钟。

环境：Visual Studio 2013  C++

语言：C++

百度地图API

：

1. 申请密钥
2. 填写信息
3. 创建应用（IP白名单记得填0.0.0.0/0）
4. 查看应用
5. 复制访问应用（AK）

：

1. 知道自己的AK (E4805d16520de693a3fe707cdc962045)
2. 知道对应转换的地址链接并了解格式中的含义

/************************************************************************//*                            网页操作		                            *//************************************************************************/// query locale place namechar* Gps_xjkg::QueryLocale(void){	char PlaceName[256] = {};	memcpy(PlaceName, CreateURL(),sizeof(PlaceName));	AccessURL(PlaceName);	GetURLStruct();		CString placename(this->PlaceName);	if (smps[KEY_PLACENAME_INFO])		printf("本地地名：%s\n", placename);	return PlaceName;}/*==========================================================* Function   : CreateURL* Description: 根据经纬度创建http请求链接* Input      : * Return     : const char* URL		链接http地址==========================================================*/char* Gps_xjkg::CreateURL(void){	char ctemp[256] = {};	// add Baidu Base URL	strcat_s(ctemp, Baidu_GPS);	// add Baidu secret key	strcat_s(ctemp, "/?ak=");	strcat_s(ctemp, ak);	// add longitude and latitude	strcat_s(ctemp, "&location=");	char tempaddr[32] = {};	memcpy(tempaddr, dtoc(Rmc.GPS_Latitude), sizeof(tempaddr));	strcat_s(ctemp, tempaddr);	strcat_s(ctemp, ",");	memcpy(tempaddr, dtoc(Rmc.GPS_Longitude), sizeof(tempaddr));	strcat_s(ctemp, tempaddr);	return ctemp;}/*==========================================================* Function   : AccessURL* Description: 链接百度地图API获取XML信息* Input      : const string URL		链接http地址* Return     : bool					失败返回false==========================================================*/#pragma comment(lib, "wininet.lib")bool Gps_xjkg::AccessURL(const std::string URL){	URL_COMPONENTS crackedURL;	char szBuffer[1024] = {};// 缓冲区	TCHAR szHostName[128] = {};	TCHAR szUrlPath[256] = {};	ZeroMemory(&crackedURL, sizeof (URL_COMPONENTS));	crackedURL.dwStructSize = sizeof (URL_COMPONENTS);	crackedURL.lpszHostName = szHostName;	crackedURL.dwHostNameLength = sizeof(szHostName);	crackedURL.lpszUrlPath = szUrlPath;	crackedURL.dwUrlPathLength = sizeof(szUrlPath);	std::wstring wstrURL;	StringToWstring(wstrURL, URL);	InternetCrackUrl(wstrURL.c_str(), wstrURL.length(), 0, &crackedURL);	FILE* file = NULL;	fopen_s(&file, "XJKG_GPS.xml", "wb");	HINTERNET hInt, hConn, hReq;	//启用HTTP建立并创建URL请求	hInt = InternetOpen(_T("Microsoft Internet Explorer"), INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);	hConn = InternetConnect(hInt, crackedURL.lpszHostName, crackedURL.nPort, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0);	hReq = HttpOpenRequest(hConn, _T("GET"), crackedURL.lpszUrlPath, NULL, _T(""), NULL, 0, 0);	char buff[64] = {};	DWORD dwLen = 0;	BOOL bResult = FALSE;	DWORD nBytesGet = 0;	BOOL bEnd = FALSE;	DWORD dwRetCode = 0;	DWORD dwSizeOfRq = sizeof(DWORD);	dwSizeOfRq = sizeof(buff);	if (HttpSendRequest(hReq, NULL, 0, NULL, 0)		&& HttpQueryInfo(hReq, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER, &dwRetCode, &dwSizeOfRq, NULL)		&& dwRetCode < 400)		bResult = TRUE;	hReq = HttpOpenRequest(hConn, _T("GET"), crackedURL.lpszUrlPath, NULL, _T(""), NULL, 0, 0);	if (HttpSendRequest(hReq, NULL, 0, NULL, 0)		&& HttpQueryInfo(hReq, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_CONTENT_ENCODING, &dwRetCode, &dwSizeOfRq, NULL)		&& dwRetCode < 400)		bResult = TRUE;		while (TRUE)	{		if (bResult)		{			// Begin			bResult = InternetReadFile(hReq, szBuffer, sizeof(szBuffer), &dwLen);			if (bResult)			{				nBytesGet += dwLen;				if (dwLen == 0)				{					bEnd = TRUE;					break;				}//				szBuffer				fwrite(szBuffer, 1, dwLen, file);			}		}		else // end			break;	}	fclose(file);	return true;}/*==========================================================* Function   : GetURLStruct* Description: 获取地址,并将地址放入类变量 PlaceName 中* Input      : * Return     : char *dest			失败返回false==========================================================*/bool Gps_xjkg::GetURLStruct(void){ 	FILE* pfile = NULL; 	fopen_s(&pfile, "XJKG_GPS.xml", "r"); 	if (!pfile){		if (smps[KEY_ERROR_INFO]) 			printf("error: open file happen error.\n"); 		return false; 	}	char cbuff[1024] = {}; 	int size = fread(cbuff, 1024, 1, pfile);	std::string str_begin = "
   
    ";	std::string str_end = "
   ";	// 字段首位	char *addr_begin = NULL;	addr_begin = strstr(cbuff, str_begin.c_str());	addr_begin += str_begin.length();	// 字段末尾	char *addr_end = strstr(cbuff, str_end.c_str());	if (addr_end < addr_begin)	{		fclose(pfile);		if (smps[KEY_ERROR_INFO])			printf("error: GetURLStruct exception!\n");		return false;	}	// 转换字段	memset(this->PlaceName, '\0', sizeof(this->PlaceName));	int pos = 0;	while (addr_begin != addr_end)	{		if (*addr_begin > 0){			this->PlaceName[pos++] = *addr_begin++;			continue;		}		char temp[4] = {};		for (int i = 0; i < 3; ++i, addr_begin++)			temp[i] = *addr_begin;				this->PlaceName[pos++] = Getplacename(temp);	}	fclose(pfile);	return true;}

注：以上函数只是给出了大概的思路。并不能直接复制粘贴使用

函数大概思路流程：

1. 动态创建可用的 URL 链接
2. 访问对应的 URL 链接并将返回的数据，尽数拷贝到 本地临时文件
3. 获取 本地临时文件 有效信息