I'm using lua to load my maps in C/SDL and i have an array in lua that determines the location of the tile image but I don't know how to transfer it to an array in C I've looked for an explanat. Library for Converting Data to and from C Structs for Lua 5.1/5.2. This library offers basic facilities to convert Lua values to and from C structs. Its main functions are struct.pack, which packs multiple Lua values into a struct-like string; and struct.unpack, which unpacks multiple Lua values from a given struct-like string. Notice that these are C characters (bytes), not Lua 1-character strings, so you need to use string.char and string.byte to convert between Lua characters and C characters. Access to Alien buffers from Lua is 1-based, not 0-based. You can also get and set other values by using buf:get(offset, type), and set it by buf:set(offset, val, type).
-->
This topic demonstrates one facet of Visual C++ interoperability. For more information, see Using C++ Interop (Implicit PInvoke).
The following code examples use the managed, unmanaged #pragma directives to implement managed and unmanaged functions in the same file, but these functions interoperate in the same manner if defined in separate files. Files containing only unmanaged functions do not need to be compiled with /clr (Common Language Runtime Compilation).
Example: Pass managed array to unmanaged function
C++ Array To Lua Converter Free
The following example demonstrates how to pass a managed array to an unmanaged function. The managed function uses pin_ptr (C++/CLI) to suppress garbage collection for the array before calling the unmanaged function. By providing the unmanaged function with a pinned pointer into the GC heap, the overhead of making a copy of the array can be avoided. To demonstrate that the unmanaged function is accessing GC heap memory, it modifies the contents of the array and the changes are reflected when the managed function resumes control.
C++ Array To Lua Converter Online
Example: Pass unmanaged array to managed function
This topic demonstrates one facet of Visual C++ interoperability. For more information, see Using C++ Interop (Implicit PInvoke).
The following code examples use the managed, unmanaged #pragma directives to implement managed and unmanaged functions in the same file, but these functions interoperate in the same manner if defined in separate files. Files containing only unmanaged functions do not need to be compiled with /clr (Common Language Runtime Compilation).
Example: Pass managed array to unmanaged function
C++ Array To Lua Converter Free
The following example demonstrates how to pass a managed array to an unmanaged function. The managed function uses pin_ptr (C++/CLI) to suppress garbage collection for the array before calling the unmanaged function. By providing the unmanaged function with a pinned pointer into the GC heap, the overhead of making a copy of the array can be avoided. To demonstrate that the unmanaged function is accessing GC heap memory, it modifies the contents of the array and the changes are reflected when the managed function resumes control.
C++ Array To Lua Converter Online
Example: Pass unmanaged array to managed function
The following example demonstrates passing an unmanaged array to a managed function. The managed function accesses the array memory directly (as opposed to creating a managed array and copying the array content), which allows changes made by the managed function to be reflected in the unmanaged function when it regains control.
C++ Array To Lua Converter Download
See also
