Build failed on Windows

Author: Heromyth

examples/HttpDemo/.vscode/launch.json

@@ -4,6 +4,17 @@
     // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
     "version": "0.2.0",
     "configurations": [
+        {
+            "name": "(Windows) launch",
+            "type": "cppvsdbg",
+            "request": "launch",
+            "program": "${workspaceFolder}/http-server.exe",
+            "args": [],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}",
+            "environment": [],
+            "externalConsole": true
+        },
         {
             "name": "(gdb) Launch-client",
             "type": "cppdbg",

source/hunt/http/server/HttpSession.d

@@ -481,6 +481,8 @@ ubyte[] getRandom(ushort len = 64)
     ubyte[] buffer;
     buffer.length = len;
     version(Windows){
+        import core.sys.windows.wincrypt;
+        import core.sys.windows.windef;
         HCRYPTPROV hCryptProv;
         assert(CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT) != 0);
         CryptGenRandom(hCryptProv, cast(DWORD)buffer.length, buffer.ptr);