Java HotSpot Virtual Machine

I'm devoliping a C DLL library which uses Windows Multimedia API. As I told in a previous message I'm having several problems and I'm begining to suspect that one of them is related to types.

For example, here is the Windows Multimedia API description for a structure call MIXERLINE:

typedef struct { 
    DWORD cbStruct; 
    DWORD dwDestination; 
    DWORD dwSource; 
    DWORD dwLineID; 
    DWORD fdwLine; 
    DWORD dwUser; 
    DWORD dwComponentType; 
    DWORD cChannels; 
    DWORD cConnections; 
    DWORD cControls; 
    CHAR  szShortName[MIXER_SHORT_NAME_CHARS]; 
    CHAR  szName[MIXER_LONG_NAME_CHARS]; 
    struct { 
        DWORD     dwType; 
        DWORD     dwDeviceID; 
        WORD      wMid; 
        WORD      wPid; 
        MMVERSION vDriverVersion; 
        CHAR      szPname[MAXPNAMELEN]; 
    } Target; 
} MIXERLINE; 

In the Windows API you can see the descriptions for each data type:

DWORD - 32-bit unsigned integer.
WORD - 16-bit unsigned integer.
CHAR - 8-bit Windows (ANSI) character.

What are the equivalent types in C for DWORD, WORD and CHAR? Do I have to use long in Java, and jlong in the C code of the DLL library, to handle DWORD variables, for example?

The DLL stops when I'm trying to execute something like:

jobjectMixerControl = (*env)->NewObject(env, jclassMixerControl, jmethodIDMixerControlConstructor);

and doesn't show any error. The Java application just ends and tells me that the exit code is 128. What does it mean? Is there a way to get more information about what's happening and which is the real cause of the error? Because I've checked jclassMixerControl and jmethodIDMixerControlConstructor variables, and both are right.