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SetWindowLong 的 nIndex 参数，GWL_USERDATA 指什么？

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Oct 21, 2009, 4:22:23 AM10/21/09
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ֻ֪�����Ǹ� LONG���� SetWindowLongPtr ����Ǹ� LONG_PTR��

��� GWL_USERDATA/GWLP_USERDATA �dz���Ա���ĸ��ط�����Ŀռ䣿�Dz��ǵ���
CreateWindow ��ʱ��Windows �Ӵ�����ģ�

�ڴ�����ṹ����� CreateWindowEx �IJ������棬Ҳû�������ĸ� LONG_PTR ����Ƚ����ѵ��� CreateWindowEx �����һ������ lpParam��Ӧ�ò��ǰɣ�msdn ˵
GWL_USERDATA ��ʼ���㣬lpParam �ɲ�һ�����㡣


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