C ++对MIDI功能的未定义引用 [英] C++ Undefined reference to MIDI function

问题描述

我只是想打印连接的MIDI输入的数量.我到底在做错什么?

I simply want to print the amount of connected MIDI inputs. What in the world am I doing wrong?

使用Code :: Blocks和GNU GCC编译器.

Using Code::Blocks and GNU GCC Compiler.

#include <windows.h>
#include <mmsystem.h>
#include <stdio.h>

int main() {
    printf("%d", midiInGetNumDevs());
    return 0;
}

编译后，我得到对.

I get undefined reference to `midiInGetNumDevs@0' upon compiling.

midiInGetNumDevs

推荐答案

您需要与winmm.lib链接.在Visual Studio中，您可以通过将其添加到项目属性中的其他依赖项中来实现.

You need to link with with winmm.lib. In Visual Studio, you do this by adding it to the Additional Dependencies in your project properties.

右键单击项目，选择 Properties ，然后选择 Linker ，然后选择 Input .将winmm.lib添加到其他依赖项中的文件列表.

Right-click on the project, select Properties, then Linker, then Input. Add winmm.lib to the list of files in Additional Dependencies.

编辑:刚注意到您正在使用GCC.在这种情况下，也许注释中链接的解决方案会更好.在标题后添加#pragma comment(lib, "winmm.lib").

just noticed you are using GCC. In this case, maybe the solution linked in the comments would be better. Add #pragma comment(lib, "winmm.lib") after your headers.

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