Problems encountered:
1. CreateWindowEx(...) returns 0, but GetLastError() returns 0...
ZC: I checked online and said that the WN_CREATE message did not return correctly, which would cause this phenomenon. My situation here is: in the process of creating the form, the function of the NULL pointer is called, which causes the creation process to report an error (but without using __try{}__except(...){}, the program has no response at all, and an error is reported no info...)
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