传递一个字节组作为方法的一个参数(CoreMIDI实现) [英] passing a bytearray as a parameter of a method (CoreMIDI implementation)
问题描述
我试图创建的MIDI信息输出到使用CoreMIDI虚拟客户机的方法。 动作的方法是MIDIReceived,它发送的MIDI数据中的MIDI数据包的形式的虚拟客户端。
I'm trying to create a method that outputs MIDI information to a virtual client using CoreMIDI. The "action" method is MIDIReceived, which sends midi data in the form of MIDI packets to a virtual client.
下面,我已经创建了一个接受一个MIDI字节作为参数,该方法应该添加到MIDI包列表,然后发送到一个虚拟的客户端MIDIReceived的方法。
Below, I've created a method that accepts a MIDI byte as a parameter, which the method should add to a MIDI Packet List which is then sent to a virtual client with MIDIReceived.
这是行不通的。
我测试过这个code,但不尝试使用自定义method--就是手动输入查询MIDI字节的数据,并能正常工作。
I've tested this code without trying to use a custom method-- that is, manually inputing midi byte data, and it works fine.
我的问题,我认为,这是我不能够正确地传递一个字节数组的方式。
The problem I have, I believe, is that I'm not able to properly pass a byte array to the method.
我得到的对象消息的错误是预期前pression。
The error I get for the object message is "expected expression".
我如何传递一个字节数组的方法? (preferably不使用NSData的)?
How can I pass a byte array to a method? (preferably without using NSData)?
#import "AppDelegate.h"
#import <CoreMIDI/CoreMIDI.h>
MIDIClientRef theMidiClient;
MIDIEndpointRef midiOut;
char pktBuffer[1024];
MIDIPacketList *pktList = (MIDIPacketList*) pktBuffer;
MIDIPacket *pkt;
@interface PacketCreateAndSend : NSObject
-(void) packetOut:(Byte*)midiByte;
@end
@implementation PacketCreateAndSend
-(void) packetOut:(Byte*)midiByte{
Byte testByte = *midiByte;
//initialize MIDI packet list:
pkt = MIDIPacketListInit(pktList);
//add packet to MIDI packet list
pkt = MIDIPacketListAdd(pktList, 1024, pkt, 0, 3, &testByte);
//send packet list to virtual client:
MIDIReceived(midiOut, pktList);
}
@end
@implementation AppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
//create MIDI client and source:
MIDIClientCreate(CFSTR("Magical MIDI"), NULL, NULL, &theMidiClient);
MIDISourceCreate(theMidiClient, CFSTR("virtual MIDI created"), &midiOut);
//create instance of PacketCreateAndSend object:
PacketCreateAndSend *testObject = [PacketCreateAndSend new];
//(here is where the error occurs)
//message object with MIDI byte data:
[testObject packetOut:{0x90, 0x3d, 0x3d}];
}
@end
正如你所看到的,我想做的就是创建一个简单的方式传输MIDI数据到一个虚拟源,但我有一些麻烦这样做。
As you can see, all I want to do is create a simple way to transmit MIDI data to a virtual source, but am having some trouble doing so.
推荐答案
下面是固定的,功能齐全的code。感谢您的帮助!
Here is the fixed, fully functional code. Thanks for the help!
#import "AppDelegate.h"
#import <CoreMIDI/CoreMIDI.h>
MIDIClientRef theMidiClient;
MIDIEndpointRef midiOut;
char pktBuffer[1024];
MIDIPacketList *pktList = (MIDIPacketList*) pktBuffer;
MIDIPacket *pkt;
@interface PacketCreateAndSend : NSObject
-(void) packetOut:(Byte[])midiByte;
@end
@implementation PacketCreateAndSend
-(void) packetOut:(Byte[])midiByte{
pkt = MIDIPacketListInit(pktList);
pkt = MIDIPacketListAdd(pktList, 1024, pkt, 0, 3, midiByte);
MIDIReceived(midiOut, pktList);
}
@end
@implementation AppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
//initialize MIDI client and source:
MIDIClientCreate(CFSTR("Magical MIDI"), NULL, NULL, &theMidiClient);
MIDISourceCreate(theMidiClient, CFSTR("virtual MIDI created"), &midiOut);
PacketCreateAndSend *testObject = [PacketCreateAndSend new];
Byte byteArray[] = {0x90, 0x3d, 0x3d};
//send the midi packet:
[testObject packetOut:byteArray];
}
@end
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