iphone - 将值从 Objective-C++ 存储/检索到 Objective-C

Question

如何在 Objective-C 数组中存储如下所示的 Objective-C++ short int 并稍后将其转换回 Objective-C++？我尝试了以下但没有成功。任何帮助都会很棒!

short int *tmpbuffer = ( short int*)malloc(sizeof(short int)*length*inData);

int count = 0;
for (count = 0; count < length*inData; count++)
{
    tmpbuffer[count] = (short int) (inbuffer[count] * 0x7fff);
}

size = fwrite(tmpbuffer, 1, sizeof(short int)*length*inData,fp);

   [fwriteSections addObject:[NSNumber numberWithShort:tmpbuffer]];
   [fwriteSections addObject:[NSNumber numberWithShort:sizeof(short int)*length*inchannels]];
   [fwriteRows addObject:fwriteSections];

Answer 1

对于简单的字节缓冲区，无需在 Objective C++ 和 Objective C 之间进行任何转换。您可以在 Objective C++ 和 Objective C 类之间传递一个 short int 指针。

如果你的意思是，如何将一个 short int 字节缓冲区转换为一个 NSArray，那么你就在正确的轨道上，只需执行以下操作:

short int *buffer = malloc(size * sizeof(short int));
NSMutableArray *shortArray = [NSMutableArray arrayWithCapacity:size];
for (NSUInteger i = 0; i < size; i++) {
    [shortArray addObject:[NSNumber numberWithShort:buffer[i]]];
}

不过我不推荐这种方法，它效率不高，你最好坚持使用 C 风格的缓冲区。