c++ - iOS - 隐式转换丢失整数精度 '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);

得到这个警告 'size_t'(又名'unsigned long')到'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;

如果这只是将一组警告换成另一组警告，您可以将类型改回 size_t，然后在调用中将每个参数转换为 int到 GreyscaleLuminanceSource。