How to use GetWindowLongPtr() in win10

凯唐 1

In Windows 10 64bit OS, when I need to get a windows style, I should use GetWindowLongPtr(this->m_hWnd, GWL_STYLE); or GetWindowLong(this->m_hWnd, GW_STYLE);?

I tried both of them, the results are both OK. But I want to know which one is better?

Thanks!

凯唐 1 Reputation point

2021-11-11T08:55:56.047+00:00

We need to compile it on both 32Bit and 64bit exe file, which one is better?

1 answer

Castorix31 81,461 Reputation points

2021-11-11T08:37:46.27+00:00

It is explained in the Note of the API :

Note
To write code that is compatible with both 32-bit and 64-bit versions of Windows, use GetWindowLongPtr. When compiling for 32-bit Windows, GetWindowLongPtr is defined as a call to the GetWindowLong function.
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1 person found this answer helpful.
凯唐 1 Reputation point

2021-11-11T08:57:46.343+00:00

But GetWindowLongPtr() is for the result which is pointer, I am wonder if it suitable for GWL_STYLE parameter.

Castorix31 81,461 Reputation points

2021-11-11T09:38:23.74+00:00

It is exactly the same thing

As the doc says, if you look the definition for 32-bit :

#define GetWindowLongPtrW GetWindowLongW

It just returns long long in 64-bit instead of long
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