c - Mac 多点触控代码

Question

您好，我不熟悉 Java 之外的任何内容，并且对我所包含的源代码有一些困难。我认为是C++。我已经安装了 Xcode，但它不只是即插即用。那么这实际上是C++吗？ Xcode 目前值得投入精力吗？最终目标是集成到 Touch Designer，那么这是否是正确的方向？

“#include ”

“#include ”

“#include ”

typedef struct { float x,y; } mtPoint;
typedef struct { mtPoint pos,vel; } mtReadout;

typedef struct {
  int frame;
  double timestamp;
  int identifier, state, foo3, foo4;
  mtReadout normalized;
  float size;
  int zero1;
  float angle, majorAxis, minorAxis; // ellipsoid
  mtReadout mm;
  int zero2[2];
  float unk2;
} Finger;

typedef void *MTDeviceRef;
typedef int (*MTContactCallbackFunction)(int,Finger*,int,double,int);

MTDeviceRef MTDeviceCreateDefault();
void MTRegisterContactFrameCallback(MTDeviceRef, MTContactCallbackFunction);
void MTDeviceStart(MTDeviceRef, int); // thanks comex


int callback(int device, Finger *data, int nFingers, double timestamp, int 
frame) {
  for (int i=0; i<nFingers; i++) {
    Finger *f = &data[i];
    printf("Frame %7d: Angle %6.2f, ellipse %6.3f x%6.3f; "
           "position (%6.3f,%6.3f) vel (%6.3f,%6.3f) "
           "ID %d, state %d [%d %d?] size %6.3f, %6.3f?\n",
       f->frame,
       f->angle * 90 / atan2(1,0),
       f->majorAxis,
       f->minorAxis,
       f->normalized.pos.x,
       f->normalized.pos.y,
       f->normalized.vel.x,
       f->normalized.vel.y,
       f->identifier, f->state, f->foo3, f->foo4,
       f->size, f->unk2);
  }
  printf("\n");
  return 0;
}

int main() {
  MTDeviceRef dev = MTDeviceCreateDefault();
  MTRegisterContactFrameCallback(dev, callback);
  MTDeviceStart(dev, 0);
  printf("Ctrl-C to abort\n");
  sleep(-1);
  return 0;
}
run: test
    ./test
test: test.m
    gcc -F/System/Library/PrivateFrameworks -framework MultitouchSupport $^ -o $@ -std=c99

Answer 1

实际上是Objective-C 。 Objective-C 是一种类 C 语言，主要由 Apple 使用，但最近已被 Swift 取代。