Windows Phone 8加载外部动态链接库DLL（非安装包内的）
Windows Phone 8加载外部动态链接库DLL（非安装包内的）在《动态加载与插件化》中大概介绍了下，wp8加载非安装包的下动态链接库，这次详细梳理下。
加载外部DLL主要的原理：
[*]通过NtCurrentTeb获得线程环境块
[*]从线程环境块中获得进程环境块
[*]在进程环境块中加载过得DLL链表
[*]从链表中找到kernelbase.dll的模块句柄
[*]从kernelbase.dll中获得LoadLibraryEx函数地址
[*]加载指定地址下的DLL
相关的结构体：
typedef struct _CLIENT_ID
{
PVOID UniqueProcess;
PVOID UniqueThread;
} CLIENT_ID;
//模块链表实体
typedef struct _MODULE_LIST_ENTRY
{
struct_MODULE_LIST_ENTRY* Flink;
struct_MODULE_LIST_ENTRY* Blink;
DWORD* baseAddress;
}MODULE_LIST_ENTRY;
//进程加载的模块信息
typedef struct _PEB_LDR_DATA
{
// BYTE fill; x86
ULONG Length;
BOOLEAN Initialized;
PVOID SsHandle ;
LIST_ENTRY InLoadOrderModuleList;
LIST_ENTRY InMemoryOrderModuleList;
MODULE_LIST_ENTRY* initModuleList;
}PEB_LDR_DATA;
//进程环境块
typedef struct _PEB
{
// BYTE fill; x86
BYTE Reserved1;
BYTE BeingDebugged;
BYTE Reserved2;
PVOID Reserved3;
PEB_LDR_DATA* ldr;
}PEB;
//线程环境块
typedef struct _TEB
{
//BYTE fill; x86
NT_TIB nt_tib;
PVOID EnvironmentPointer;
CLIENT_ID id;
PVOID ActiveRpcHandle;
PVOID ThreadLocalStoragePointer;
PEB* currentPEB;
}TEB;
typedef HMODULE(*LoadLibraryEx)(
LPCTSTR lpLibFileName,
HANDLE hFile,
DWORD dwFlags
);
获取kernelbase.dll模块句柄的类定义
namespace Anye
{
namespace Native
{
public ref class DllHandle sealed
{
friend ref class NativeInterop;
friend class NativeHelper;
public:
int GetModule();
private:
HMODULE _handle;
DllHandle(HMODULE handle);
//获取指定名称的函数地址
void* GetFunction(LPCSTR name);
};
public ref class NativeInterop sealed
{
public:
NativeInterop();
//加载指定路径下的DLL
DllHandle^ LoadLibrary(Platform::String^ name);
//获取KernelBase.dll的模块句柄
DllHandle^ GetKernel();
int GetModule();
private:
DllHandle^ _kernel;
LoadLibraryEx _loadLibrary;
HMODULE getKernelModule();
};
class NativeHelper
{
public:
NativeHelper(const wchar_t* path);
void* GetFunction(LPCSTR name);
private:
DllHandle^ _interop;
};
}
}
主要的加载逻辑
HMODULE NativeInterop::getKernelModule()
{
//获取线程环境快
TEB* teb = NtCurrentTeb();
获取KernelBase.dll的模块句柄PS：保险点的方法市历遍DLL初始化链表通过模块名称确定
return (HMODULE) teb->currentPEB->ldr->initModuleList->Flink->baseAddress;
}
DllHandle^ NativeInterop::LoadLibrary(Platform::String^ name)
{
if (_loadLibrary == nullptr)//获取LoadLibraryExW函数地址
_loadLibrary = (LoadLibraryEx)_kernel->GetFunction("LoadLibraryExW");
HMODULE module = _loadLibrary(name->Data(), nullptr, 0);
if (module != nullptr)
return ref new DllHandle(module);
return nullptr;
}
void* DllHandle::GetFunction(LPCSTR name)
{
return GetProcAddress(_handle, name);
}
NativeHelper
NativeHelper::NativeHelper(const wchar_t* path)
{
auto inter = ref new NativeInterop();
String^ pathString = (Platform::String^)Platform::StringReference(path);
_interop = inter->LoadLibrary(pathString);
}
void* NativeHelper::GetFunction(LPCSTR name)
{
return _interop->GetFunction(name);
}
下面是加载wp手机SD卡上的plugin.dll的例子
动态库项目
动态链接库逻辑
extern "C"
{
__declspec(dllexport) void* Create();
}
namespace Plugin
{
class IPlugin
{
public:
virtual void Show(Platform::String^ msg) = 0;
};
class TestPlugin : public IPlugin
{
public:
TestPlugin()
{
}
void Show(Platform::String^ msg)
{
(ref new Windows::UI::Popups::MessageDialog(msg))->ShowAsync();
}
};
}
void* Create()
{
return new Plugin::TestPlugin();
}
加载外部动态链接库
class IPlugin
{
public:
virtual void Show(Platform::String^ msg) = 0;
};
void NativeEntry::Load(Platform::String^ path)
{ //path 是 D:\\Downloads\\plugin.dll,D盘就是sd
Anye::Native::NativeHelper* h = new Anye::Native::NativeHelper(path->Data());
CreateFunc func;
func = (CreateFunc)h->GetFunction("Create");
IPlugin* plugin = (IPlugin*)func();
plugin->Show("我是"+path+"里的插件^_^");
}
好了例子就到这了，我们获得了LoadLibraryExW函数，不局限于加载外部DLL，也可以去加载系统的DLL，去访问一些微软未公开的API，如只读访问注册表信息
Anye::Native::NativeInterop interop;
auto h = interop.LoadLibrary("ADVAPI32LEGACY.DLL");
Anye_RegCreateKeyEx = (RegCreateKeyFunc)GetFunc(h->GetModule(), "RegCreateKeyW");
Anye_RegSetValueEx = (RegSetValueFunc)GetFunc(h->GetModule(), "RegSetValueW");
Anye_RegQueryValueEx = (RegQueryValueFunc)GetFunc(h->GetModule(), "RegQueryValueW");
Anye_RegCloseKey = (RegCloseKeyFunc)GetFunc(h->GetModule(), "RegCloseKey");
Anye_RegOpenKey = (RegOpenKeyFunc)GetFunc(h->GetModule(), "RegOpenKeyW");
Anye_RegEnumKey = (RegEnumKeyFunc)GetFunc(h->GetModule(), "RegEnumKeyW");
源码：https://onedrive.live.com/redir?resid=30D5EB407F085DD8!31587&authkey=!ABzmTswcDh91WQw&ithint=file%2czip
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