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Title: Lib HID / HID API
Post by: RKSJBeck on November 14, 2025, 11:57:39 PM

I've been trying to use the latest HID API in both source files , I get a linker error, and a compiled DLL. Obviously a good DLL would be the ticket, but I don't seem to able to get it to work either. I'm really a noob when it comes to non-embedded code, so I know I'm missing something obvious. I keep getting :
"POLINK: error: Unresolved external symbol '_hid_init@0' - referenced from 'C:\Users\James Beck\Documents\Pelles C Projects\LibHIDTest\output\main.obj'.
POLINK: fatal error: 1 unresolved external(s)."
Even though I have loaded the DLL and even put the "lib" file in the linker library list.
I have included the DLL and header files, can anyone get the thing to work?

Title: Re: Lib HID / HID API
Post by: TimoVJL on November 15, 2025, 12:58:23 AM

Have to use __cdecl calling convention.

Also header modification may help

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/* To be removed in v1.0 */
#ifndef HID_API_CALL
    #define HID_API_CALL /**< API call macro */
#endif

and define preprocessor symbol

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HID_API_CALL=__cdeclor in source

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#define HID_API_CALL __cdecl

HINT:
open import library with pope.exe or TLPEView to see import symbol

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pFile    Data    Description    Value
000016FC    0008    Type    IMPORT_OBJECT_CODE
        Name Type    IMPORT_OBJECT_NAME_NO_PREFIX
        Symbol info:    
        Symbol Name    _hid_open
        Dll    hidapi.dll
        Name    hid_open

That _hid_open is cdecl symbol

Title: Re: Lib HID / HID API
Post by: RKSJBeck on November 21, 2025, 11:48:27 PM

Thanks for the help TimoVJL!

I'll give it a go.
It does compile without errors or warnings, and it links.

Title: Re: Lib HID / HID API
Post by: Vortex on November 22, 2025, 09:32:21 AM

Converting the import library to the module definition file :

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LIBRARY hidapi
EXPORTS
"hid_close"
"hid_enumerate"
"hid_error"
"hid_exit"
"hid_free_enumeration"
"hid_get_device_info"
"hid_get_feature_report"
"hid_get_indexed_string"
"hid_get_input_report"
"hid_get_manufacturer_string"
"hid_get_product_string"
"hid_get_report_descriptor"
"hid_get_serial_number_string"
"hid_init"
"hid_open"
"hid_open_path"
"hid_read"
"hid_read_error"
"hid_read_timeout"
"hid_send_feature_report"
"hid_send_output_report"
"hid_set_nonblocking"
"hid_version"
"hid_version_str"
"hid_winapi_descriptor_reconstruct_pp_data"
"hid_winapi_get_container_id"
"hid_winapi_set_write_timeout"
"hid_write"

All the functions are following the __cdecl calling convention.

Pelles C forum

C language => Beginner questions => Topic started by: RKSJBeck on November 14, 2025, 11:57:39 PM