blocks|key|640882|text|虽然reader.dll无法加载GPSVC.dll和IESHIMS.DLL。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|640883|640884|corflags+application.exe+/32bit%2B|code-block|syntax|javascript|640885|640886|版本:+v4.0.30319|640887|CLR头:+2.5|640888|PE+:+PE32|640889|CorFlags+:3|640890|伊洛尼:1|640891|32位:+1|640892|签署:0|640893|entityMap^0|0|12|0|0|0|0|0|E|0|0|9|0|0|9|0|0|B|0|0|5|0|0|6|0|0|4|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|15|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|16|8|@]|D|@]|E|$J|K]]|$1|L|3|-4|5|6|7|17|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1H|8|@$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|U|3|V|5|6|7|1K|8|@$9|1L|A|1M|B|C]]|D|@]|E|$]]|$1|W|3|X|5|6|7|1N|8|@$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|Y|3|Z|5|6|7|1Q|8|@$9|1R|A|1S|B|C]]|D|@]|E|$]]|$1|10|3|-4|5|6|7|1T|8|@]|D|@]|E|$]]]|11|$]]

Although the reader.dll is unable to load GPSVC.dll and IESHIMS.DLL. 
i managed to make it work by running the corflags command on application.exe
the application is now marked as 32bit:

<hr>

<pre><code>corflags application.exe /32bit+
</code></pre>

<hr>

Version : v4.0.30319

CLR Header: 2.5

PE : PE32

CorFlags : 3

ILONLY : 1

32BIT : 1

Signed : 0

blocks|key|640764|text|如果问题确实“找不到”，那么使用Sysinternals的ProcMon将显示系统在哪里查找DLL。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|640765|然而，这种异常通常意味着“我找到了DLL，但无法加载它”，这可能是因为缺少DLL的依赖项，而不是DLL本身，或者因为DLL与试图加载DLL的应用程序不兼容。如果您的C#应用程序设置为“任意CPU”，并且您位于64位计算机上，则加载非托管32位DLL时会出现这种错误。|640766|隔离问题的一种方法是创建一个简单的C/C%2B%2B项目来加载DLL。(如果您无法访问导入库，则使用LoadLibrary动态加载它。)然后使用Dependency来分析测试工具，它将报告缺少DLL的名称。|640767|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

If the problem is really "cannot be found", then using ProcMon from Sysinternals will show you where the system is looking for the DLL.

However, often these sort of exceptions mean 'I found the DLL but I can't load it', and that can be because a dependency of the DLL is missing rather than the DLL itself, or because the DLL is incompatible with the app trying to load it. If your C# app is set for 'Any CPU' and you're on a 64bit machine, you'll get this sort of error loading unmanaged 32-bit DLLs.

One way to isolate the problem would be to create a simple C/C++ project which loads the DLL. (Load it dynamically with LoadLibrary if you don't have access to the import lib.) Then use Dependency Walker to profile the test harness, and it will report the names of missing DLLs.

blocks|key|640741|text|如果它是一个简单的C+DLL，它只需要在与.exe相同的文件夹中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|640742|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If it's a simple C DLL it just needs to be in the same folder as the .exe.

blocks|key|611077|text|我在另一篇文章里发现了这个。也许这会对你的处境有所帮助|type|unstyled|depth|inlineStyleRanges|entityRanges|data|611078|NUnit+"missing"+GPSVC.DLL+on+Windows+7/64|offset|length|611079|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/1877098/nunit-missing-gpsvc-dll-on-windows-7-64^0|0|0|15|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I found this in another post. Maybe it will help your situation

<a href="https://stackoverflow.com/questions/1877098/nunit-missing-gpsvc-dll-on-windows-7-64">NUnit &quot;missing&quot; GPSVC.DLL on Windows 7/64</a>

blocks|key|611170|text|对我来说，解决方案是在客户端计算机上安装C%2B%2B+Redistrable+X64。(Microsoft+Visual+C%2B%2B可为Visual+2015、2017和2019重新发行。)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|611171|dll已位于与.exe文件相同的文件夹中的正确位置。|611172|在这里您可以找到下载链接：|611173|https://support.microsoft.com/en-us/topic/the-latest-supported-visual-c-downloads-2647da03-1eea-4433-9aff-95f26a218cc0|offset|length|611174|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|3A|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@$H|U|I|V|1|W]]|A|$]]|$1|J|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|G]]]]

For me the solution was to installing the C++ Redistrable X64 on client machine.
(Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019.)
The dll was already on the right place, in the same folder than the .exe file.
Here you found the download link:
<a href="https://support.microsoft.com/en-us/topic/the-latest-supported-visual-c-downloads-2647da03-1eea-4433-9aff-95f26a218cc0" rel="nofollow noreferrer">https://support.microsoft.com/en-us/topic/the-latest-supported-visual-c-downloads-2647da03-1eea-4433-9aff-95f26a218cc0</a>

how to load a dll in a c# project

error:

<blockquote>
 Unable to load DLL 'Reader.dll': The specified module could not be
 found. (Exception from HRESULT: 0x8007007E)
</blockquote>

code sample:

<pre><code>[DllImport("Reader.dll")]
 public static extern byte OpenReader(ref IntPtr hCom, byte LinkType, string com_port);
</code></pre>

image:
<img src="https://i.stack.imgur.com/fQGIC.png" alt="exception screenshot">

Unable to load DLL in C#

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技术创作特训营有奖征文

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何在c#项目中加载dll误差无法加载DLL 'Reader.dll'：找不到指定的模块。(HRESULT例外: 0x8007007E)代码示例[DllImport("Reader.dll")] public static extern byte OpenReader(ref IntPtr hCom, byte LinkType, string com_port);图片：​

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