无法找到我的本机DLL（错误代码0x8007007E） [英] Unable to Find my Native DLL (Error Code 0x8007007E)

问题描述

Hello Experts，



我创建了一个Native Dll（myNativeDll.dll）只是为了保持简单，它暴露了一种方法。



__declspec（dllexport）char * GetStringFromDll（）

{



const size_t alloc_size = 128;

STRSAFE_LPSTR结果=（STRSAFE_LPSTR）CoTaskMemAlloc（alloc_size）;

STRSAFE_LPCSTR retstr =此值从本机dll返回;

StringCchCopyA（结果，alloc_size，retstr）;

返回（char *）结果;

}



客户端（托管应用程序）定义了一个帮助类来使用这个dll作为

Hello Experts,

I have created a Native Dll (myNativeDll.dll) just to keep it simple it exposes one method.

__declspec(dllexport)char * GetStringFromDll( )
{

const size_t alloc_size = 128;
STRSAFE_LPSTR result = (STRSAFE_LPSTR)CoTaskMemAlloc( alloc_size );
STRSAFE_LPCSTR retstr = "This value is returned from native dll";
StringCchCopyA( result, alloc_size, retstr );
return (char *) result;
}

on the client side (Managed App) defined a helper class to use this dll as

namespace MarshalStringApp
{
    public class MyDllWrapper
    {
        //  Calling Standard Windows Functions.
        [DllImport("User32.dll", EntryPoint = "MessageBox", CharSet = CharSet.Auto)]
        public static extern int MsgBox(int hWnd, String text, String caption, uint type);

        //  Calling Functions from our Dll.
        [DllImport("myNativeDll.dll")]
        public static extern String GetStringFromDll();
    }
}

并在表单中添加了一个处理程序来调用此函数。

and added a handler to the form to call this function.

private void btnGetStringFromDll_Click(object sender, EventArgs e)
       {
           String str = "";
           try
           {
               str = MyDllWrapper.GetStringFromDll();
               MessageBox.Show("String Returned [" + str + "]");
           }
           catch (Exception eX)
           {
               MessageBox.Show(eX.Message);
           }
       }

我收到异常代码（0x8007007E），提示DLLmyNativeDll.dll 找不到，我试着把它复制到客户端的文件夹（exe所在的地方），但没有用。我应该在哪里复制这个本机dll，让这个应用程序工作。或者我错过了什么。



任何帮助都将受到高度赞赏。



-prateek。

I am getting an exception Code (0x8007007E), suggesting that DLL "myNativeDll.dll" is not found, i tried copying it to the client's folder to (where exe resides) but no avail. where should i copy this native dll, for this app to work. or i am missing something.

any help will be highly appreciated.

-prateek.

推荐答案

最快的解决方案是将此dll放在WINDOWS \SYSTEM32文件夹中，看看它是否被加载。

Quickest solution is to put this dll in WINDOWS\SYSTEM32 folder and see whether it gets loaded or not.

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