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我目前正在编写一个游戏，我打算将 .caf 声音文件从 iPhone 传输到我的 C++ 服务器。现在，当我向 sendGameUpdateWithFile 函数发送消息时，我得到一个EXC_BAD_ACCESS，我真的不知道为什么。

尽管这与任何大学作业无关，但请记住，我是一名 CS 学生，而不是（还）不是专业的网络程序员，因此请在之后判断我的代码。

这是我用来将数据传输到服务器的代码（现在崩溃了）：

- (void) sendGameUpdateWithFile:(NSString*)filePath gameID:(NSInteger)gameID {
    NSMutableData* data = [[NSMutableData alloc] init];
    data = [NSMutableData dataWithContentsOfFile:filePath];

    fileheadPacket head;

    head.msgtype = 0x12;
    strncpy(head.data1, [myUsername cStringUsingEncoding:NSASCIIStringEncoding], [myUsername length]);
    int followingPackets = (([data length] % 1024 == 0) || ([data length] < 1024))? ([data length]/1024) : ([data length]/1024)+1;
    head.following = followingPackets;
    head.fileid = gameID;
    head.size = sizeof(packet);

    [mySock writeData:[NSData dataWithBytes:&head length:sizeof(packet)] withTimeout:-1 tag:7];

    filePacket sendPackets[followingPackets];

    for(int i = 0; i < followingPackets; i++){
        NSRange thisRange;
        thisRange.location = i*1024;
        thisRange.length = (i+1)*1024;

        filePacket tmp;
        tmp.msgtype = 0x13;
        tmp.size = sizeof(filePacket);
        memset(tmp.data1, 0, sizeof(tmp.data1));
        [data getBytes:tmp.fileBuffer range:thisRange];

        strncpy((char*)&sendPackets[i], (char*)&tmp, sizeof(tmp));
    }

    for(int i = 0; i < followingPackets; i++){
        [mySock writeData:[NSData dataWithBytes:&sendPackets[i] length:sizeof(filePacket)] withTimeout:-1 tag:3];
    }
}

我用于数据的结构如下所示：

typedef struct file_packet {
    int msgtype:8;
    int size:16;
    int nul:8;
    int following:24;
    int emp:8;
    char data1[64];
    char fileBuffer[1024];
} filePacket;

typedef struct filehead_packet {
    int msgtype:8;
    int size:16;
    int nul:8;
    int following:24;
    int emp:8;
    char data1[64];
    int fileid;
    char rest[60];
} fileheadPacket;

服务器需要给定的 msgtypes——问题出在客户端。

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