Question 325960 in Flutter Question posted in
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Flutter how to create boolean field in mapped Struct using FFIGen

I’m trying to using latest FFIGEN (11.0.0) and almost latest Flutter 3.16.4 (dart 3.2.3)

This my my struct in C++

struct TestStruct {
    const char *name;
    bool isOnline;
    uint8_t batteryLevel;
    uint32_t timestamp;
};

And this is exported using

extern "C" struct TestStruct;

The problem is that every time I run FFIGEN it generates

final class TestStruct extends ffi.Struct {
  external ffi.Pointer<ffi.Char> name;

  @ffi.Int()
  external int isOnline;

  @ffi.Uint8()
  external int batteryLevel;

  @ffi.Uint32()
  external int timestamp;
}

I have to manually change boolean entry to:

  @ffi.Bool()
  external bool isOnline;

I even tried to leave it and map int to bool later, but dart object is not correct.

Any ideas how to make ffigen understand bool field?

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2

Answers


  1. Chosen as BEST ANSWER
    0

    Answer to this issue was to include #include <stdbool.h> in this file. Even though everything worked from C++ code, dart was not aware of bool type.


  2. 0

    I was experiencing the same issue, and looking at the output there was a problem with a header file not being found. I added this line to my .bashrc file:

    export CPATH="$(clang -v 2>&1 | grep "Selected GCC installation" | rev | cut -d' ' -f1 | rev)/include"

    Now the error is gone and booleans are properly generated.

    This GitHub issue was useful.

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