在js-ctypes中调用SCardListReaders时出错 [英] Error while calling SCardListReaders in js-ctypes

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本文介绍了在js-ctypes中调用SCardListReaders时出错的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我使用js-ctypes来为Firefox插件调用winscard函数。 SCardEstablishContext正常工作，但在调用SCardListReaders时会返回以下错误：
SCARD_ERROR_INVALID_HANDLE 0x80100006



这是我的代码：



  var {Cu} = require（chrome）; 
 var {ctypes} = Cu.import（resource：//gre/modules/ctypes.jsm，null）; 
 const NULL = ctypes.voidptr_t（0）; 
 var is64bit = ctypes.voidptr_t.size == 4？假：真; 
 var TYPES = {
 ABI：is64bit？ ctypes.default_abi：ctypes.winapi_abi，
 CALLBACK_ABI：is64bit？ ctypes.default_abi：ctypes.stdcall_cabi，
 DWORD：ctypes.uint32_t，
 LPCVOID：ctypes.voidptr_t，
 LPSCARDCONTEXT：ctypes.voidptr_t，
 LPSTR：ctypes.jschar.ptr， 
 LPCSTR：ctypes.char.ptr 
 
 var CONST = {
 SCARD_SCOPE_USER：0，
 SCARD_SCOPE_SYSTEM：2，
 SCARD_S_SUCCESS：0 
}; 
 var cardLib = ctypes.open（Winscard）; 
变种SCardEstablishContext = cardLib.declare（ SCardEstablishContext，TYPES.ABI，TYPES.DWORD，TYPES.DWORD，TYPES.LPCVOID，TYPES.LPCVOID，TYPES.LPSCARDCONTEXT）; 
 var ContextHandle = TYPES.LPSCARDCONTEXT（）; 
 var ret = SCardEstablishContext（CONST.SCARD_SCOPE_SYSTEM，null，null，ContextHandle.address（））; 
 var SCardListReadersA = cardLib.declare（SCardListReadersA，TYPES.ABI，TYPES.DWORD，TYPES.LPSCARDCONTEXT，TYPES.LPCSTR，TYPES.LPSTR，TYPES.DWORD）; 
 var reader_count = TYPES.DWORD（）; 
 var reader_names = ctypes.jschar.ptr（）; 
 var ret = SCardListReadersA（ContextHandle.address（），null，reader_names，reader_count）; 
 cardLib.close（）;


解决方案

文档显示这个函数是在这样的一个方法有两种方法可以做到这一点。

方法1



发送 null 缓冲区，取回一个计数，自己分配一个缓冲区到这个计数，发送这个分配的缓冲区来填充。在这里看到： GitHubGIST :: Noitidart / _ff-addon-snippet-WinAPI-listCardReadersManAlloc.js 

  Cu.import（'resource：//gre/modules/ctypes.jsm'）; 
 
 var is64bit = ctypes.voidptr_t.size == 4？假：真; 
 var ifdef_UNICODE = true; 
 
 var TYPES = {
 ABI：is64bit？ ctypes.default_abi：ctypes.winapi_abi，
 CALLBACK_ABI：is64bit？ ctypes.default_abi：ctypes.stdcall_cabi，
 
 CHAR：ctypes.char，
 DWORD：ctypes.uint32_t，
 LONG：ctypes.long，
 LPCVOID：ctypes。 voidptr_t，
 ULONG_PTR：is64bit？ ctypes.uint64_t：ctypes.unsigned_long，
 WCHAR：ctypes.jschar 
}; 
 
 //高级类型 - 基于简单类型
 TYPES.LPSTR = TYPES.CHAR.ptr; 
 TYPES.LPCSTR = TYPES.CHAR.ptr; 
 TYPES.LPDWORD = TYPES.DWORD.ptr; 
 TYPES.LPCWSTR = TYPES.WCHAR.ptr; 
 TYPES.LPWSTR = TYPES.WCHAR.ptr; 
 TYPES.SCARDCONTEXT = TYPES.ULONG_PTR; 
 
 //高级高级类型 - 基于高级类型
 TYPES.LPCTSTR = ifdef_UNICODE？ TYPES.LPCWSTR：TYPES.LPCSTR; 
 TYPES.LPTSTR = ifdef_UNICODE？ TYPES.LPWSTR：TYPES.LPSTR; 
 TYPES.PSCARDCONTEXT = TYPES.SCARDCONTEXT.ptr; 
 TYPES.LPSCARDCONTEXT = TYPES.SCARDCONTEXT.ptr; 
 $ b var CONST = {
 SCARD_SCACHE_USER：0，
 SCARD_S_SUCCESS：0 
}; 
 
 var cardLib = ctypes.open（'Winscard'）; 
变种SCardEstablishContext = cardLib.declare（ SCardEstablishContext，TYPES.ABI，TYPES.DWORD，TYPES.DWORD，TYPES.LPCVOID，TYPES.LPCVOID，TYPES.LPSCARDCONTEXT）; 
变种SCardListReaders = cardLib.declare（ifdef_UNICODESCardListReadersW：SCardListReadersA，TYPES.ABI，TYPES.LONG，TYPES.SCARDCONTEXT，TYPES.LPCTSTR，TYPES.LPTSTR，TYPES.LPDWORD）; 
 var SCardFreeMemory = cardLib.declare（'SCardFreeMemory'，TYPES.ABI，TYPES.LONG，TYPES.SCARDCONTEXT，TYPES.LPCVOID）; 
 var SCardReleaseContext = cardLib.declare（'SCardReleaseContext'，TYPES.ABI，TYPES.LONG，TYPES.SCARDCONTEXT）; 
 
 //类型，常量和函数声明完成，现在让我们使用它
 try {
 var hSC = TYPES.SCARDCONTEXT（）; 
 var rez_SCEC = SCardEstablishContext（CONST.SCARD_SCOPE_SYSTEM，null，null，hSC.address（））; 
 if（rez_SCEC.toString（）！= CONST.SCARD_S_SUCCESS.toString（））{
 console.error（'failed to establish context！error code was：'+ rez_SCEC +'in other terms是：0x'+ rez_SCEC.toString（16）+'你可以在这里查找这个错误值：https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29的.aspx＃smart_card_return_values'）; 
抛出新错误（'建立上下文失败！'）; 
} 
 
 try {
 var reader_count = TYPES.DWORD（）; 
 var rez_SCLR = SCardListReaders（hSC，null，null，reader_count.address（））; 
 console.log（'rez_SCLR：'，rez_SCLR，rez_SCLR.toString（））; 
 if（rez_SCLR.toString（）！= CONST.SCARD_S_SUCCESS.toString（））{
 console.error（'读者列表失败！错误代码为：'+ rez_SCLR +'它是：0x'+ rez_SCLR.toString（16）+'你可以在这里查找这个错误值：https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85 ％29.aspx＃smart_card_return_values'）; 
抛出新的错误（'未能获取读者列表！'）; 
 
 
 console.log（'parseInt（reader_count.value）：'，parseInt（reader_count.value））; 
 
 var reader_names = TYPES.LPTSTR.targetType.array（parseInt（reader_count.value））（）; 
 console.log（'reader_names.toString（）'，reader_names.toString（））; 
 console.log（'reader_names.address（）。toString（）'，reader_names.address（）。toString（））; 
 
 var rez_SCLR = SCardListReaders（hSC，null，reader_names，reader_count.address（））; 
 console.log（'rez_SCLR：'，rez_SCLR，rez_SCLR.toString（））; 
 if（rez_SCLR.toString（）！= CONST.SCARD_S_SUCCESS.toString（））{
 console.error（'读取者列表失败！错误代码是：'+ rez_SCLR +'它是：0x'+ rez_SCLR.toString（16）+'你可以在这里查找这个错误值：https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85 ％29.aspx＃smart_card_return_values'）; 
抛出新的错误（'未能获取读者列表！'）; 
} 
 console.error（'reader_names.toString（）'，reader_names.toString（））; 
 console.error（'reader_names.address（）。toString（）'，reader_names.address（）。toString（））; 
 
} finally {
 var rez_release = SCardReleaseContext（hSC）; 
 console.log（'rez_release：'，rez_release，rez_release.toString（））; 
 if（rez_release.toString（）！= CONST.SCARD_S_SUCCESS.toString（））{
 console.error（'failed to release context！error code was：'+ rez_release +'in other terms是：0x'+ rez_release.toString（16）+'你可以在这里查找这个错误值：https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29的.aspx＃smart_card_return_values'）; 
抛出新错误（'未能释放上下文！'）; 
} 
} 
 
} finally {
 cardLib.close（）; 
 console.log（'cardLib closed'）; 
 
 $ / code>



方法2



发送一个特殊的常量和一个0缓冲区，它会自动为你分配一个缓冲区，并将你的0缓冲区指向的地址改变为这个自动分配的缓冲区，然后你必须释放这个缓冲区。这可以在这里看到： GitHubGIST :: Noitidart / _ff-addon-snippet-WinAPI-listCardReadersAutoAlloc.js 

  Cu.import（'resource：//gre/modules/ctypes.jsm'）; 
 
 var is64bit = ctypes.voidptr_t.size == 4？假：真; 
 var ifdef_UNICODE = true; 
 
 var TYPES = {
 ABI：is64bit？ ctypes.default_abi：ctypes.winapi_abi，
 CALLBACK_ABI：is64bit？ ctypes.default_abi：ctypes.stdcall_cabi，
 
 CHAR：ctypes.char，
 DWORD：ctypes.uint32_t，
 LONG：ctypes.long，
 LPCVOID：ctypes。 voidptr_t，
 ULONG_PTR：is64bit？ ctypes.uint64_t：ctypes.unsigned_long，
 WCHAR：ctypes.jschar 
}; 
 
 //高级类型 - 基于简单类型
 TYPES.LPSTR = TYPES.CHAR.ptr; 
 TYPES.LPCSTR = TYPES.CHAR.ptr; 
 TYPES.LPDWORD = TYPES.DWORD.ptr; 
 TYPES.LPCWSTR = TYPES.WCHAR.ptr; 
 TYPES.LPWSTR = TYPES.WCHAR.ptr; 
 TYPES.SCARDCONTEXT = TYPES.ULONG_PTR; 
 
 //高级高级类型 - 基于高级类型
 TYPES.LPCTSTR = ifdef_UNICODE？ TYPES.LPCWSTR：TYPES.LPCSTR; 
 TYPES.LPTSTR = ifdef_UNICODE？ TYPES.LPWSTR：TYPES.LPSTR; 
 TYPES.PSCARDCONTEXT = TYPES.SCARDCONTEXT.ptr; 
 TYPES.LPSCARDCONTEXT = TYPES.SCARDCONTEXT.ptr; 
 $ b var CONST = {
 SCARD_SCACHE_USER：0，
 SCARD_S_SUCCESS：0 
}; 
 
 var cardLib = ctypes.open（'Winscard'）; 
变种SCardEstablishContext = cardLib.declare（ SCardEstablishContext，TYPES.ABI，TYPES.DWORD，TYPES.DWORD，TYPES.LPCVOID，TYPES.LPCVOID，TYPES.LPSCARDCONTEXT）; 
变种SCardListReaders = cardLib.declare（ifdef_UNICODESCardListReadersW：SCardListReadersA，TYPES.ABI，TYPES.LONG，TYPES.SCARDCONTEXT，TYPES.LPCTSTR，TYPES.LPTSTR.ptr，TYPES.LPDWORD）; 
 var SCardFreeMemory = cardLib.declare（'SCardFreeMemory'，TYPES.ABI，TYPES.LONG，TYPES.SCARDCONTEXT，TYPES.LPCVOID）; 
 var SCardReleaseContext = cardLib.declare（'SCardReleaseContext'，TYPES.ABI，TYPES.LONG，TYPES.SCARDCONTEXT）; 
 
 //类型，常量和函数声明完成，现在让我们使用它
 try {
 var hSC = TYPES.SCARDCONTEXT（）; 
 var rez_SCEC = SCardEstablishContext（CONST.SCARD_SCOPE_SYSTEM，null，null，hSC.address（））; 
 if（rez_SCEC.toString（）！= CONST.SCARD_S_SUCCESS.toString（））{
 console.error（'failed to establish context！error code was：'+ rez_SCEC +'in other terms是：0x'+ rez_SCEC.toString（16）+'你可以在这里查找这个错误值：https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29的.aspx＃smart_card_return_values'）; 
抛出新错误（'建立上下文失败！'）; 
} 
 
尝试{
 var reader_count = TYPES.DWORD（'0xffffffff'）; 
 var reader_names = TYPES.LPTSTR（）; 
 
 console.log（'reader_names.toString（）'，reader_names.toString（））; 
 console.log（'reader_names.address（）。toString（）'，reader_names.address（）。toString（））; 
 
 var rez_SCLR = SCardListReaders（hSC，null，reader_names.address（），reader_count.address（））; 
 console.log（'rez_SCLR：'，rez_SCLR，rez_SCLR.toString（））; 
 if（rez_SCLR.toString（）！= CONST.SCARD_S_SUCCESS.toString（））{
 console.error（'读者列表失败！错误代码为：'+ rez_SCLR +'它是：0x'+ rez_SCLR.toString（16）+'你可以在这里查找这个错误值：https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85 ％29.aspx＃smart_card_return_values'）; 
抛出新的错误（'未能获取读者列表！'）; 
 
 
 console.error（'reader_names.toString（）'，reader_names.toString（））; 
 console.error（'reader_names.address（）。toString（）'，reader_names.address（）。toString（））; 
 
 var rez_free = SCardFreeMemory（hSC，reader_names）; 
 console.log（'rez_free：'，rez_free，rez_free.toString（））; 
 if（rez_free.toString（）！= CONST.SCARD_S_SUCCESS.toString（））{
 console.error（'未能释放列出读卡器的多字符串！错误代码是：'+ rez_free +'，换句话说就是：0x'+ rez_free.toString（16）+'你可以在这里查找这个错误值：https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738 ％28V = vs.85％29.aspx＃smart_card_return_values'）; 
抛出新错误（'未能释放列出读卡器的多字符串！'）; 
} 
} finally {
 var rez_release = SCardReleaseContext（hSC）; 
 console.log（'rez_release：'，rez_release，rez_release.toString（））; 
 if（rez_release.toString（）！= CONST.SCARD_S_SUCCESS.toString（））{
 console.error（'failed to release context！error code was：'+ rez_release +'in other terms是：0x'+ rez_release.toString（16）+'你可以在这里查找这个错误值：https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29的.aspx＃smart_card_return_values'）; 
抛出新错误（'未能释放上下文！'）; 
} 
} 
 
} finally {
 cardLib.close（）; 
 console.log（'cardLib closed'）; 
}


I am calling winscard functions using js-ctypes for a Firefox addon. SCardEstablishContext works properly but when calling SCardListReaders returns the following error: SCARD_ERROR_INVALID_HANDLE 0x80100006

Here is my code:

var {Cu} = require("chrome");
var{ctypes} = Cu.import("resource://gre/modules/ctypes.jsm", null);
const NULL = ctypes.voidptr_t(0);
var is64bit = ctypes.voidptr_t.size == 4 ? false : true;
var TYPES = {
    ABI: is64bit ? ctypes.default_abi : ctypes.winapi_abi,
    CALLBACK_ABI: is64bit ? ctypes.default_abi : ctypes.stdcall_cabi,
    DWORD: ctypes.uint32_t,
    LPCVOID: ctypes.voidptr_t,
    LPSCARDCONTEXT: ctypes.voidptr_t,
    LPSTR: ctypes.jschar.ptr,
    LPCSTR: ctypes.char.ptr
}
var CONST = {
    SCARD_SCOPE_USER: 0,
    SCARD_SCOPE_SYSTEM: 2,
    SCARD_S_SUCCESS: 0
};
var cardLib = ctypes.open("Winscard");
var SCardEstablishContext = cardLib.declare("SCardEstablishContext", TYPES.ABI, TYPES.DWORD, TYPES.DWORD, TYPES.LPCVOID, TYPES.LPCVOID, TYPES.LPSCARDCONTEXT);
var ContextHandle = TYPES.LPSCARDCONTEXT();
var ret = SCardEstablishContext(CONST.SCARD_SCOPE_SYSTEM, null, null, ContextHandle.address());
var SCardListReadersA = cardLib.declare("SCardListReadersA", TYPES.ABI, TYPES.DWORD, TYPES.LPSCARDCONTEXT, TYPES.LPCSTR, TYPES.LPSTR, TYPES.DWORD );
var reader_count = TYPES.DWORD();
var reader_names = ctypes.jschar.ptr();
var ret = SCardListReadersA(ContextHandle.address(), null, reader_names,reader_count );
cardLib.close();

解决方案

The documentation shows that this function was created in such a way that there are two ways to do this.

Method 1

Send null buffer, get back a count, allocate a buffer yourself to that count, send this allocted buffer to get populated. That is seen here: GitHubGIST :: Noitidart / _ff-addon-snippet-WinAPI-listCardReadersManAlloc.js

Cu.import('resource://gre/modules/ctypes.jsm');

var is64bit = ctypes.voidptr_t.size == 4 ? false : true;
var ifdef_UNICODE = true;

var TYPES = {
    ABI: is64bit ? ctypes.default_abi : ctypes.winapi_abi,
    CALLBACK_ABI: is64bit ? ctypes.default_abi : ctypes.stdcall_cabi,

    CHAR: ctypes.char,
    DWORD: ctypes.uint32_t,
    LONG: ctypes.long,
    LPCVOID: ctypes.voidptr_t,
    ULONG_PTR: is64bit ? ctypes.uint64_t : ctypes.unsigned_long,
    WCHAR: ctypes.jschar
};

// advanced types - based on simple types
TYPES.LPSTR = TYPES.CHAR.ptr;
TYPES.LPCSTR = TYPES.CHAR.ptr;
TYPES.LPDWORD = TYPES.DWORD.ptr;
TYPES.LPCWSTR = TYPES.WCHAR.ptr;
TYPES.LPWSTR = TYPES.WCHAR.ptr;
TYPES.SCARDCONTEXT = TYPES.ULONG_PTR;

// advanced advanced types - based on advanced types
TYPES.LPCTSTR = ifdef_UNICODE ? TYPES.LPCWSTR : TYPES.LPCSTR;
TYPES.LPTSTR = ifdef_UNICODE ? TYPES.LPWSTR : TYPES.LPSTR;
TYPES.PSCARDCONTEXT = TYPES.SCARDCONTEXT.ptr;
TYPES.LPSCARDCONTEXT = TYPES.SCARDCONTEXT.ptr;

var CONST = {
    SCARD_AUTOALLOCATE: TYPES.DWORD('0xffffffff'),
    SCARD_SCOPE_SYSTEM: 2,
    SCARD_SCOPE_USER: 0,
    SCARD_S_SUCCESS: 0
};

var cardLib = ctypes.open('Winscard');
var SCardEstablishContext = cardLib.declare('SCardEstablishContext', TYPES.ABI, TYPES.DWORD, TYPES.DWORD, TYPES.LPCVOID, TYPES.LPCVOID, TYPES.LPSCARDCONTEXT);
var SCardListReaders = cardLib.declare(ifdef_UNICODE ? 'SCardListReadersW' : 'SCardListReadersA', TYPES.ABI, TYPES.LONG, TYPES.SCARDCONTEXT, TYPES.LPCTSTR, TYPES.LPTSTR, TYPES.LPDWORD);
var SCardFreeMemory = cardLib.declare('SCardFreeMemory', TYPES.ABI, TYPES.LONG, TYPES.SCARDCONTEXT, TYPES.LPCVOID);
var SCardReleaseContext = cardLib.declare('SCardReleaseContext', TYPES.ABI, TYPES.LONG, TYPES.SCARDCONTEXT);

// types, consts, and functions declarations complete, now lets use it
try {
    var hSC = TYPES.SCARDCONTEXT();
    var rez_SCEC = SCardEstablishContext(CONST.SCARD_SCOPE_SYSTEM, null, null, hSC.address());
    if (rez_SCEC.toString() != CONST.SCARD_S_SUCCESS.toString()) {
        console.error('failed to establish context! error code was: ' + rez_SCEC + ' in other terms it is: 0x' + rez_SCEC.toString(16) + ' you can look up this error value here: https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29.aspx#smart_card_return_values');
        throw new Error('failed to establish context!');
    }

    try {
        var reader_count = TYPES.DWORD();               
        var rez_SCLR = SCardListReaders(hSC, null, null, reader_count.address());
        console.log('rez_SCLR:', rez_SCLR, rez_SCLR.toString());
        if (rez_SCLR.toString() != CONST.SCARD_S_SUCCESS.toString()) {
            console.error('failed to get list of readers! error code was: ' + rez_SCLR + ' in other terms it is: 0x' + rez_SCLR.toString(16) + ' you can look up this error value here: https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29.aspx#smart_card_return_values');
            throw new Error('failed to get list of readers!');
        }

        console.log('parseInt(reader_count.value):', parseInt(reader_count.value));

        var reader_names = TYPES.LPTSTR.targetType.array(parseInt(reader_count.value))();
        console.log('reader_names.toString()', reader_names.toString());
        console.log('reader_names.address().toString()', reader_names.address().toString());

        var rez_SCLR = SCardListReaders(hSC, null, reader_names, reader_count.address());
        console.log('rez_SCLR:', rez_SCLR, rez_SCLR.toString());
        if (rez_SCLR.toString() != CONST.SCARD_S_SUCCESS.toString()) {
            console.error('failed to get list of readers! error code was: ' + rez_SCLR + ' in other terms it is: 0x' + rez_SCLR.toString(16) + ' you can look up this error value here: https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29.aspx#smart_card_return_values');
            throw new Error('failed to get list of readers!');
        }
        console.error('reader_names.toString()', reader_names.toString());
        console.error('reader_names.address().toString()', reader_names.address().toString());

    } finally {
        var rez_release = SCardReleaseContext(hSC);
        console.log('rez_release:', rez_release, rez_release.toString());
        if (rez_release.toString() != CONST.SCARD_S_SUCCESS.toString()) {
            console.error('failed to release context! error code was: ' + rez_release + ' in other terms it is: 0x' + rez_release.toString(16) + ' you can look up this error value here: https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29.aspx#smart_card_return_values');
            throw new Error('failed to release context!');
        }
    }

} finally {
    cardLib.close();
    console.log('cardLib closed');
}

Method 2

Send a special constant and a 0 buffer, and it will auto-allocate a buffer for you and change the address your 0 buffer points to - to this auto-allocated buffer, which you then have to free. This is seen here: GitHubGIST :: Noitidart / _ff-addon-snippet-WinAPI-listCardReadersAutoAlloc.js

Cu.import('resource://gre/modules/ctypes.jsm');

var is64bit = ctypes.voidptr_t.size == 4 ? false : true;
var ifdef_UNICODE = true;

var TYPES = {
    ABI: is64bit ? ctypes.default_abi : ctypes.winapi_abi,
    CALLBACK_ABI: is64bit ? ctypes.default_abi : ctypes.stdcall_cabi,

    CHAR: ctypes.char,
    DWORD: ctypes.uint32_t,
    LONG: ctypes.long,
    LPCVOID: ctypes.voidptr_t,
    ULONG_PTR: is64bit ? ctypes.uint64_t : ctypes.unsigned_long,
    WCHAR: ctypes.jschar
};

// advanced types - based on simple types
TYPES.LPSTR = TYPES.CHAR.ptr;
TYPES.LPCSTR = TYPES.CHAR.ptr;
TYPES.LPDWORD = TYPES.DWORD.ptr;
TYPES.LPCWSTR = TYPES.WCHAR.ptr;
TYPES.LPWSTR = TYPES.WCHAR.ptr;
TYPES.SCARDCONTEXT = TYPES.ULONG_PTR;

// advanced advanced types - based on advanced types
TYPES.LPCTSTR = ifdef_UNICODE ? TYPES.LPCWSTR : TYPES.LPCSTR;
TYPES.LPTSTR = ifdef_UNICODE ? TYPES.LPWSTR : TYPES.LPSTR;
TYPES.PSCARDCONTEXT = TYPES.SCARDCONTEXT.ptr;
TYPES.LPSCARDCONTEXT = TYPES.SCARDCONTEXT.ptr;

var CONST = {
    SCARD_AUTOALLOCATE: TYPES.DWORD('0xffffffff'),
    SCARD_SCOPE_SYSTEM: 2,
    SCARD_SCOPE_USER: 0,
    SCARD_S_SUCCESS: 0
};

var cardLib = ctypes.open('Winscard');
var SCardEstablishContext = cardLib.declare('SCardEstablishContext', TYPES.ABI, TYPES.DWORD, TYPES.DWORD, TYPES.LPCVOID, TYPES.LPCVOID, TYPES.LPSCARDCONTEXT);
var SCardListReaders = cardLib.declare(ifdef_UNICODE ? 'SCardListReadersW' : 'SCardListReadersA', TYPES.ABI, TYPES.LONG, TYPES.SCARDCONTEXT, TYPES.LPCTSTR, TYPES.LPTSTR.ptr, TYPES.LPDWORD);
var SCardFreeMemory = cardLib.declare('SCardFreeMemory', TYPES.ABI, TYPES.LONG, TYPES.SCARDCONTEXT, TYPES.LPCVOID);
var SCardReleaseContext = cardLib.declare('SCardReleaseContext', TYPES.ABI, TYPES.LONG, TYPES.SCARDCONTEXT);

// types, consts, and functions declarations complete, now lets use it
try {
    var hSC = TYPES.SCARDCONTEXT();
    var rez_SCEC = SCardEstablishContext(CONST.SCARD_SCOPE_SYSTEM, null, null, hSC.address());
    if (rez_SCEC.toString() != CONST.SCARD_S_SUCCESS.toString()) {
        console.error('failed to establish context! error code was: ' + rez_SCEC + ' in other terms it is: 0x' + rez_SCEC.toString(16) + ' you can look up this error value here: https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29.aspx#smart_card_return_values');
        throw new Error('failed to establish context!');
    }

    try {
        var reader_count = TYPES.DWORD('0xffffffff');
        var reader_names = TYPES.LPTSTR();

        console.log('reader_names.toString()', reader_names.toString());
        console.log('reader_names.address().toString()', reader_names.address().toString());

        var rez_SCLR = SCardListReaders(hSC, null, reader_names.address(), reader_count.address());
        console.log('rez_SCLR:', rez_SCLR, rez_SCLR.toString());
        if (rez_SCLR.toString() != CONST.SCARD_S_SUCCESS.toString()) {
            console.error('failed to get list of readers! error code was: ' + rez_SCLR + ' in other terms it is: 0x' + rez_SCLR.toString(16) + ' you can look up this error value here: https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29.aspx#smart_card_return_values');
            throw new Error('failed to get list of readers!');
        }

        console.error('reader_names.toString()', reader_names.toString());
        console.error('reader_names.address().toString()', reader_names.address().toString());

        var rez_free = SCardFreeMemory(hSC, reader_names);
        console.log('rez_free:', rez_free, rez_free.toString());
        if (rez_free.toString() != CONST.SCARD_S_SUCCESS.toString()) {
            console.error('failed to free the multi-string that lists the card readers! error code was: ' + rez_free + ' in other terms it is: 0x' + rez_free.toString(16) + ' you can look up this error value here: https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29.aspx#smart_card_return_values');
            throw new Error('failed to free the multi-string that lists the card readers!');
        }
    } finally {
        var rez_release = SCardReleaseContext(hSC);
        console.log('rez_release:', rez_release, rez_release.toString());
        if (rez_release.toString() != CONST.SCARD_S_SUCCESS.toString()) {
            console.error('failed to release context! error code was: ' + rez_release + ' in other terms it is: 0x' + rez_release.toString(16) + ' you can look up this error value here: https://msdn.microsoft.com/en-us/library/windows/desktop/aa374738%28v=vs.85%29.aspx#smart_card_return_values');
            throw new Error('failed to release context!');
        }
    }

} finally {
    cardLib.close();
    console.log('cardLib closed');
}

这篇关于在js-ctypes中调用SCardListReaders时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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