将 const wchar_t* 转换为 const char* [英] Convert const wchar_t* to const char*

问题描述

我正在尝试使用 GetHostByName() 这需要一个 const char*.我的 URL 位于成本 wchar_t* 格式的变量中.如何转换它以便 GetHostByName 可以使用它?代码.

I am trying to use GetHostByName() this requires a const char*. I have my URL in a variable that is in a cost wchar_t* format. How can I convert this so that GetHostByName may use it? The code.

BSTR bstr;
pBrowser->get_LocationURL(&bstr);
std::wstring wsURL;
wsURL = bstr;

size_t DSlashLoc = wsURL.find(L"://");
if (DSlashLoc != wsURL.npos)
    {
    wsURL.erase(wsURL.begin(), wsURL.begin() + DSlashLoc + 3);
    }
DSlashLoc = wsURL.find(L"www.");
if (DSlashLoc == 0)
    {
    wsURL.erase(wsURL.begin(), wsURL.begin() + 4);
    }
DSlashLoc = wsURL.find(L"/");
if (DSlashLoc != wsURL.npos)
    {
    wsURL.erase(DSlashLoc);
    }
    wprintf(L"\n   Current Website URL: %s\n\n", wsURL.c_str());

    HOSTENT *pHostEnt;
    int  **ppaddr;
    SOCKADDR_IN sockAddr;
    char* addr;
    pHostEnt = gethostbyname(wsURL.c_str());
    ppaddr = (int**)pHostEnt->h_addr_list;
    sockAddr.sin_addr.s_addr = **ppaddr;
    addr = inet_ntoa(sockAddr.sin_addr);
    printf("\n   Current Website IP:%s", addr);

int length = WideCharToMultiByte (CP_ACP, WC_COMPOSITECHECK, wsURL.c_str(), -1, NULL, 0,  NULL, NULL); 
std::string LogURL(length+1, 0); 
int result = WideCharToMultiByte (CP_ACP, WC_COMPOSITECHECK, wsURL.c_str(), -1, &LogURL[0],length+1,  NULL, NULL);
myfile << "\n   Current Website URL:" << LogURL;
myfile << "\n   Current Website IP:"<< addr;

这是我得到的错误.IntelliSense:const wchar_t *"类型的参数与const char *"类型的参数不兼容

This is the error I am getting. IntelliSense:argument of type "const wchar_t *" is incompatible with parameter of type "const char *"

推荐答案

这似乎有效.欢迎评论.

This seems to work. Comments welcome.

int Newlength = WideCharToMultiByte (CP_ACP, WC_COMPOSITECHECK, wsURL.c_str(), -1, NULL, 0,  NULL, NULL);
std::string NewLogURL(Newlength+1, 0); 
int Newresult = WideCharToMultiByte (CP_ACP, WC_COMPOSITECHECK, wsURL.c_str(), -1, &NewLogURL[0],Newlength+1,  NULL, NULL);

    HOSTENT *pHostEnt;
    int  **ppaddr;
    SOCKADDR_IN sockAddr;
    char* addr;

    pHostEnt = gethostbyname(NewLogURL.c_str());
    ppaddr = (int**)pHostEnt->h_addr_list;
    sockAddr.sin_addr.s_addr = **ppaddr;
    addr = inet_ntoa(sockAddr.sin_addr);
    printf("\n   Current Website IP:%s", addr);

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