C ++ WinHttpSendRequest Eror C2664

Question

我正在嘗試制作一個程序，從需要您通過其他網站登錄的網站獲取HTML。 我遇到了WinHttpSendRequest的問題。 我預計所有這些都沒有錯誤。

1. 碼：

    len = (DWORD)strlen("username=aan1982&pswd=admin1234&sub_check=1&sub_login="); bResult = WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, "username=aan1982&pswd=admin1234&sub_check=1&sub_login=", len, len, 0); 

   錯誤：

    C2664 'BOOL' WinHttpSendRequest(HINTERNET,LPCWSTR,DWORD,LPVOID,DWORD,DWORD,DWORD_PTR)': cannot convert argument 4 from 'const char [55]' to 'LPVOID' 

2. 碼：

    LPVOID data = "username=aan1982&pswd=admin1234&sub_check=1&sub_login="; len = (DWORD)strlen("username=aan1982&pswd=admin1234&sub_check=1&sub_login="); bResult = WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, data, len, len, 0); 

   錯誤：

    C2440 'initializing': cannot convert from 'const char [55]' to 'LPVOID' 

3. 碼：

    len = (DWORD)strlen("username=aan1982&pswd=admin1234&sub_check=1&sub_login="); bResult = WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, (LPVOID)"username=aan1982&pswd=admin1234&sub_check=1&sub_login=", len, len, 0); 

   錯誤：

    LNK1120 9 unresolved externals LNK2019 unresolved external symbol __imp__WinHttpCloseHandle@4 referenced in function "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl GetHTML(void)" (?GetHTML@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ) 

   和其他8個更像LNK2019

Answer 1

char    p[] = "username=aan1982&pswd=admin1234&sub_check=1&sub_login=";
LPVOID  ptr = static_cast<LPVOID>( p );
int     len = strlen( p );