有一个名为 ffi
的库,它承诺允许用户加载系统本地库并调用其中的函数。
使用他们的示例,我尝试使用 User32.dll 中的 MessageBox 函数:
var ref = require('ref');
var ffi = require('ffi');
var Struct = require('ref-struct');
// Define Winapi types according to
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa383751%28v=vs.85%29.aspx
var winapi = {};
winapi.void = ref.types.void;
winapi.PVOID = ref.refType(winapi.void);
winapi.HANDLE = winapi.PVOID;
winapi.HWND = winapi.HANDLE;
winapi.WCHAR = ref.types.char;
winapi.LPCWSTR = ref.types.CString;
winapi.UINT = ref.types.uint;
// Try to load message box function as defined in
// https://msdn.microsoft.com/en-us/library/windows/desktop/ms645505%28v=vs.85%29.aspx
var current = ffi.Library("user32.dll", {
'MessageBox': [ 'int', [ winapi.HWND, winapi.LPCWSTR, winapi.LPCWSTR, winapi.UINT ] ]
});
current.MessageBox(0, "sss", "sss", 0);
这个出现了错误:
C:\MYSELF\programing\nodejs\node_modules\ffi\lib\dynamic_library.js:112
throw new Error('Dynamic Symbol Retrieval Error: ' + this.error())
^
Error: Dynamic Symbol Retrieval Error: Win32 error 127
at DynamicLibrary.get (C:\MYSELF\programing\nodejs\node_modules\ffi\lib\dynamic_library.js:112:11)
at C:\MYSELF\programing\nodejs\node_modules\ffi\lib\library.js:50:19
at Array.forEach (native)
at Object.Library (C:\MYSELF\programing\nodejs\node_modules\ffi\lib\library.js:47:28)
at Object.<anonymous> (C:\MYSELF\programing\nodejs\ffitest\winapi.js:23:19)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Function.Module.runMain (module.js:501:10)
我试图将声明更改为一些无意义的内容,但是我得到了相同的错误,所以我猜它确实是错误的。我该如何修复它以使其正常工作?我是否指定了不正确的数据类型?