Precautions for porting to x64 (including amd64 and em64t)

Win64 adopts the llp64 data mode, that is, the data type, such as int and long, is still 32-bit, and the address is 64-bit. In this way, code porting is less work. Generally, you can use the same code to generate a 32-bit or 64-bit program. Note that some data types, such as lparam, often use this parameter to pass the address, so this type is processed by pointer, that is, it is 64-bit. If you often write the following function segments:

Sendmessage (..., (long) lptext );

In 32-Bit mode, no problem occurs. In 64-Bit mode, an error occurs. Therefore, it is best to add the/wp64 option during compilation. This will give you some warnings to help you find errors in the program.