Visual C++ Linking with mmsystem.h

Hello I am trying to write a simple sound recorder in a win32 forms application using visual c++ and am having problems linking to mmsystem.h I have the recorder working fine in a console application but cannot get it to work as a win32 app. when trying to reference the function waveInGetNumDevs() I get a linking error when trying to compile:

Error 1 error LNK2028: unresolved token (0A000031) "extern "C" unsigned int __stdcall waveInGetNumDevs(void)" (?waveInGetNumDevs@@$$J10YGIXZ) referenced in function "public: __clrcall record::Form1::Form1(void)" (??0Form1@record@@$$FQ$AAM@XZ) record.objrecord


I am assuming this has to do with managed and unmanaged code mixed together. So i made a header file referencing just the needed function and surrounded it with #pragma unmanaged and am compiling with /clr option.

Here is the header file:

Code:

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#sound.h
#include "windows.h"
#include "mmsystem.h"
#pragma unmanaged
WINMMAPI  UINT WINAPI waveInGetNumDevs(void);

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Here is the code generating the error:

Code:

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#include "sound.h"
#pragma managed
namespace record {

        using namespace System;
        using namespace System::ComponentModel;
        using namespace System::Collections;
        using namespace System::Windows::Forms;
        using namespace System::Data;
        using namespace System::Drawing;

        public ref class Form1 : public System::Windows::Forms::Form
        {
                HWAVEIN hwin;
                MMRESULT result;
                int numDevices;
        public:
                Form1(void)
                {
                        InitializeComponent();
                        numDevices = waveInGetNumDevs();
                }

---

Any help on this matter would be appreciated. Thanks a lot.

--koooee

mmsystem.h is a header and you don't link with headers, you link with libraries. There is probably a library you need to explicitly link with (winmm.lib if I'm not mistaken) in your project settings.

i feel stupid....(that was in my console version of the code) thanks for the reply.

if anyone is wondering...put this line in stdafx.h

Code:

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#pragma comment(lib, "winmm.lib")

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