iOS - 隐式转换失去整数精度'size_t'（又名'unsigned long'）到'int'

Question

size_t subsetBytesPerRow, subsetHeight, subsetWidth, subsetHeight;

方法调用：

(new GreyscaleLuminanceSource(subsetData, subsetBytesPerRow, subsetHeight,
                              0, 0, subsetWidth, subsetHeight));

方法声明：

GreyscaleLuminanceSource(unsigned char* greyData, int dataWidth, int dataHeight,
      int left, int top, int width, int height);

获取此警告 'size_t' (aka 'unsigned long') to 'int'。如何解决这个问题？

Answer 1

只需将类型声明更改为int：

int subsetBytesPerRow, subsetHeight, subsetWidth, subsetHeight;

如果这只是为另一组警告换了一组警告，您可以将类型更改回size_t，然后在调用int时将每个参数投放到GreyscaleLuminanceSource