我正在尝试使用GetHostByName()这需要一个const char *。我的URL在一个成本为wchar_t *格式的变量中。如何转换它以便GetHostByName可以使用它?代码。
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:类型为“const wchar_t *”的参数与“const char *”类型的参数不兼容
答案 0 :(得分:4)
我喜欢使用wcstombs(),因为它很容易使用。
试试这个样本:
char *str = new char[4046];
wchar_t array[] = L"Hello World";
wcstombs(str, array, 12);
std::cout << str;
这是你必须将wchar_t转换为char *。
的方法修改强>
代码中的更改:
char* addr = new char[4046];
wcstombs(wsURL, addr, wsURL.size());
pHostEnt = gethostbyname(addr);
答案 1 :(得分:1)
这似乎有效。欢迎评论。
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);
答案 2 :(得分:0)
WideCharToMultiByte是Win32 API调用,它在一天结束时执行此操作,但根据您使用的框架(MFC,WTL等),可能有更好的方法。
答案 3 :(得分:0)
/***** This code is well done *****/
#include...
#include...
int wmain(int argc, wchar_t *argv[])
{
...
...
char *path = new char[255];
wcstombs(path, argv[2], 255);
IplImage *img;
if (img = cvLoadImage (path, 1))
{
Mat input_img = Mat (img);
imshow ("haha",input_img);
waitKey(0);
}
...
...
//wcout<<endl<<argv[2];
}