Add build script and readme to C++ sample

examples/VeloCppWinSample/VeloCppWinSample.cpp

@@ -6,6 +6,7 @@
 #include <memory.h>
 #include <tchar.h>
 
+#include "constants.h"
 #include "velopack.hpp"
 
 #pragma comment(linker, \
@@ -20,7 +21,6 @@
 HINSTANCE hInst;
 const WCHAR szTitle[] = L"Velopack C++ Sample App";
 const WCHAR szWindowClass[] = L"VeloCppWinSample";
-const CHAR szUpdateUrl[] = "C:\\Source\\velopack\\build\\Debug\\net6.0\\Releases";
 velo_update_info updInfo = velo_update_info();
 std::string updPath = "";
 std::string currentVersion = "";
@@ -132,7 +132,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 			if ((HWND)lParam == hCheckButton)
 			{
 				try {
-					velo_update_info info = velo_check_for_updates(szUpdateUrl);
+					velo_update_info info = velo_check_for_updates(UPDATE_URL);
 					if (info.is_update_available) {
 						// this is a hack to convert ascii to wide string
 						std::wstring message = L"Update available: " + std::wstring(info.version.begin(), info.version.end());
@@ -153,7 +153,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 			{
 				if (updInfo.is_update_available) {
 					try {
-						velo_download_updates(szUpdateUrl, updInfo.file_name.c_str(), [](int x) {}, [&hWnd](std::string path)
+						velo_download_updates(UPDATE_URL, updInfo.file_name.c_str(), [](int x) {}, [&hWnd](std::string path)
 							{
 								updPath = path;
 								std::wstring message = L"Downloaded successfully to: " + std::wstring(path.begin(), path.end());

examples/VeloCppWinSample/constants.h

@@ -0,0 +1 @@
+#define UPDATE_URL "REPLACE_ME" 

examples/VeloCppWinSample/dev-build.bat

@@ -0,0 +1,53 @@
+@echo off
+REM This script requires several tools to be installed for it to work:
+REM cargo (rust): winget install Rustlang.Rustup
+REM Nerdbank.GitVersioning (nbgv): dotnet tool install --global nbgv
+REM C++ Build Tools, typically installed via "Desktop development with C++" workload.
+
+setlocal enabledelayedexpansion
+
+if "%~1"=="" (
+    echo Version number is required.
+    echo Usage: build.bat [version] [extra_args...]
+    exit /b 1
+)
+
+echo.
+echo Building Velopack Rust
+cd %~dp0..\..\src\Rust
+cargo build --features windows
+
+echo.
+echo Building Velopack Vpk
+cd %~dp0..\..\
+dotnet build src/Velopack.Vpk/Velopack.Vpk.csproj
+
+cd %~dp0
+
+set VSWHERE_PATH="%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe"
+
+echo.
+echo Locating MSBuild using vswhere
+for /f "usebackq tokens=*" %%i in (`%VSWHERE_PATH% -latest -requires Microsoft.Component.MSBuild -find MSBuild\**\Bin\MSBuild.exe`) do (
+  set "MSBUILD_PATH=%%i"
+  goto :buildCpp
+)
+
+:buildCpp
+if not defined MSBUILD_PATH (
+    echo MSBuild not found, make sure Visual Studio is installed with C++ Build Tools.
+    exit /b 1
+)
+
+echo #define UPDATE_URL R"(%~dp0releases)" > constants.h
+
+echo.
+echo Building VeloCppWinSample
+cd %~dp0
+"%MSBUILD_PATH%" VeloCppWinSample.sln /p:Configuration=Release
+
+echo #define UPDATE_URL "REPLACE_ME" > constants.h
+
+echo.
+echo Building Velopack Release v%~1
+%~dp0..\..\build\Debug\net8.0\vpk pack -u VeloCppWinSample -o releases -p x64\Release -f net8-x64-desktop -v %*

examples/VeloCppWinSample/readme.md

@@ -0,0 +1,8 @@
+# VeloCppWinSample
+_Prerequisites: Rust/Cargo, Dotnet, Msbuild_
+
+This app is purely a proof of concept at this time, `velopack.hpp` currently only works on windows and needs testing / fixes for other operating systems, and probably also needs fixing for unicode/strings. This sample is made up of a simple Win32 desktop app, generated via a Visual Studio template, and it includes `velopack.hpp` and [`subprocess.h`](https://github.com/sheredom/subprocess.h). 
+
+Also, this is using command line features not currently exposed in the main Velopack releases, so you can only build releases from source by using the `dev-build.bat [version]` script. Trying to build/use this sample with the mainstream `vpk` tool is not guarenteed to work at this time.
+
+If you are interested in using Velopack for your C++ project and are willing to help with the design of `velopack.hpp` (either with suggestions, or code), please drop in our Discord and I would be happy to discuss / work with you to polish this up.

examples/VeloCppWinSample/velopack.hpp

@@ -252,7 +252,7 @@ void velo_download_updates(const char* url_or_path, const char* release_name,
 				uint8_t progress = static_cast<uint8_t>(std::stoi(line));
 				progress_fn(progress);
 			}
-			catch (const std::exception& e) {
+			catch (const std::exception&) {
 			}
 			return false;
 		};