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16_1_Setting_Up_Libwally.md
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@ -90,3 +90,70 @@ Finally, you can install:
$ sudo make install
```
## Preparing for Libwally
As usual, you'll need to include appropriate files and link appropriate libraries to use Libwally.
### Including the Files
There are a considerable number of possible include files:
```
$ ls /usr/include/wally*
/usr/include/wally_address.h /usr/include/wally_bip39.h /usr/include/wally_elements.h /usr/include/wally_script.h
/usr/include/wally_bip32.h /usr/include/wally_core.h /usr/include/wally.hpp /usr/include/wally_symmetric.h
/usr/include/wally_bip38.h /usr/include/wally_crypto.h /usr/include/wally_psbt.h /usr/include/wally_transaction.h
```
Fortunately, the file names largely match the sections in the [docs](https://wally.readthedocs.io/en/release_0.7.8/), so you should be able to include the correct files based on what you're doing.
### Including the Libraries
You also will need to link appropriate libraries:
```
$ ls /usr/lib/libsecp* /usr/lib/libwally*
/usr/lib/libsecp256k1.a /usr/lib/libwallycore.la /usr/lib/libwallycore.so.0
/usr/lib/libsecp256k1.la /usr/lib/libwallycore.so /usr/lib/libwallycore.so.0.0.0
```
Mostly, we'll be using `libwallycore`.
## Setting Up a Libwally Program
Compared to some of the previous libraries, Libwally is ridiculously easy to initialize:
```
lw_response = wally_init(0);
```
And then when you're done, there's a handy function to clean up any allocated memory:
```
wally_cleanup(0);
```
In both cases, the argument is for flags, but is currently set to `0`.
### Testing a Test Libwally Program
The src directory contains [testwally.c](/src/16_1_testwally.c), which just shows how the initialize and cleanup work.
You can compile it as follows:
```
$ cc testwally.c -lwallycore -o testwally
```
Afterward you can run it:
```
$ ./testwally
Startup: 0
```
The "Startup" value is the return from `wally_init`. The `0` value may look discouraging, but that's what you want to see:
```
include/wally_core.h:#define WALLY_OK 0 /** Success */
```
## Summary: Setting Up Libwally
By installing the Libwally includes and libraries, you can use it to access a number of cryptographic and library functions, which can complement your RPC and ZMG libraries.
So what does it do exactly? That's what the next sections detail.
## What's Next?
Learn more about "Programming Bitcoin with Libwally" in [16.2: Using BIP32 in Libwally](16_2_Using_BIP32_in_Libwally.md).