运行时错误49错误的DLL调用约定 [英] Run Time Error 49 Bad DLL Calling Convention

问题描述

尊敬的专家，

我正在尝试从VBA调用Dll中的子例程，但始终收到错误运行时错误49错误的DLL调用约定".关于我在做什么错的任何建议吗?

Dear Experts,

I am trying to call a subroutine in my Dll from VBA but keep getting the error "Run Time Error 49 Bad DLL Calling Convention". Any suggestions on what I am doing wrong?

<code>Declare Sub init_gen_rand Lib "SFMT.dll" (seed As Double)</code>

<code>__declspec( dllexport ) void init_gen_rand(uint32_t seed);</code>

在另一个示例中，我正在调用不带参数的函数，并且确实获得了返回数字，但是即使数据类型为无符号整数uint32_t，返回数字有时还是为负数.怎么了?

In this other example, I am calling a function with no argument and do get a return number but the return numbers are sometimes negative even though the data type is an unsigned integer uint32_t. What is going wrong?

Declare Function gen_rand32 Lib "SFMT.dll" () As Double

<code>__declspec( dllexport ) uint32_t gen_rand32(void);</code>

感谢您的帮助，
Neil

Thanks for your help,
Neil

推荐答案

uint32不是双精度型.我会说这就是问题所在.

A uint32 is not a double. I''d say that''s the issue.

VBA 只能成功导入使用__stdcall 调用约定声明的函数;尝试这种方式:

The VBA can succesfully import only function declared with the __stdcall calling convention; try this way:

Declare Function gen_rand32 Lib "SFMT.dll" () As Long

__declspec( dllexport ) uint32_t __stdcall gen_rand32(void);

谢谢，有什么建议吗?我也尝试过用Long获得相同的结果.

Thanks, any suggestions? I have also tried Long with the same result.

<pre>Declare Function gen_rand32 Lib "C:\Users\Neil\Documents\Visual Studio 2010\Projects\SFMT\Release\SFMT.dll" () As Long<br />
Declare Sub init_gen_rand Lib "C:\Users\Neil\Documents\Visual Studio 2010\Projects\SFMT\Release\SFMT.dll" (seed As Long)</pre>

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