Posted to tcl by schelte at Tue Oct 25 22:47:52 GMT 2022view pretty
I'm trying to use hidapi (https://github.com/libusb/hidapi) via cffi. Because wchar_t has a different size on linux and windows, I tried to use a type alias. But I get an error: package require cffi if {$tcl_platform(platform) eq "windows"} { set dll hidapi.dll cffi::alias define wchar_t ushort } else { set dll libhidapi-hidraw.so cffi::alias define wchar_t uint } cffi::Wrapper create hidapi [file join $dir $dll] hidapi function hid_get_product_string {int zero} { dev pointer.hid_device wstr {wchar_t[nchars] retval} nchars {size_t {default 256}} } Invalid value "wchar_t[nchars]". Invalid base type. Error defining function hid_get_product_string.