急！！'type cast' : cannot convert from '' to 'float'

[文理科]

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int r1=GetRValue(cr1);
int r2=GetRValue(cr2);

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float dr=(((float)(r2-r1))/(float)(rect.Width)); //错在这里

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error C2440: 'type cast' : cannot convert from '' to 'float'
Context does not allow for disambiguation of overloaded function

请问怎么解决～～....

[schlafenhamster]

rect.Width()

[yschenwei]

float dr=((float)(r2-r1))/((float)(rect.Width));

[yschenwei]

晕，schlafenhamster是对的，汗，看错了。
Width是方法，不是属性。

[张赐]

rect.Width()

哈哈

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