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liquidatyliquidaty
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C sharp example (#240)
* add C# example
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‎examples/c-sharp/count/Makefile

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.PHONY: publish-osx publish-win help clean
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help:
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@echo "make publish-win|publish-osx|clean"
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publish-win:
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dotnet publish -c Release -r win-x64 --self-contained true -o ./publish/win-x64
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@echo "Remember to copy libzsv.dll into ./publish/win-x64"
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publish-osx:
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dotnet publish -c Release -r osx-arm64 --self-contained true -o ./publish/osx-arm64
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@echo "Remember to copy libzsv.dylib into ./publish/win-x64"
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clean:
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rm -rf obj bin publish

‎examples/c-sharp/count/Program.cs

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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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class ZsvInterop {
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private const string ZsvDll =
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#if WINDOWS || WIN32 || WIN64 || _WIN32 || __WIN32
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"libzsv.dll";
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#elif __MACOS__ || MACOS || OSX
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"libzsv.dylib";
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#else
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"libzsv.so"; // Default or throw an error
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#endif
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private const string CRT_LIB =
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#if WINDOWS
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"msvcrt.dll";
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#else
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"libc";
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#endif
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[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
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public delegate void ZsvRowHandler(IntPtr parser);
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[DllImport(ZsvDll, CallingConvention = CallingConvention.Cdecl)]
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public static extern IntPtr zsv_new(IntPtr opts);
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[DllImport(ZsvDll, CallingConvention = CallingConvention.Cdecl)]
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public static extern void zsv_delete(IntPtr parser);
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[DllImport(ZsvDll, CallingConvention = CallingConvention.Cdecl)]
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public static extern void zsv_set_row_handler(IntPtr parser, ZsvRowHandler handler);
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[DllImport(ZsvDll, CallingConvention = CallingConvention.Cdecl)]
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public static extern void zsv_set_context(IntPtr parser, IntPtr context);
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[DllImport(ZsvDll, CallingConvention = CallingConvention.Cdecl)]
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public static extern void zsv_set_input(IntPtr parser, IntPtr file);
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[DllImport(ZsvDll, CallingConvention = CallingConvention.Cdecl)]
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public static extern int zsv_parse_more(IntPtr parser);
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[DllImport(ZsvDll, CallingConvention = CallingConvention.Cdecl)]
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public static extern void zsv_finish(IntPtr parser);
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[DllImport(ZsvDll, CallingConvention = CallingConvention.Cdecl)]
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public static extern UIntPtr zsv_cell_count(IntPtr parser);
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[DllImport(ZsvDll, CallingConvention = CallingConvention.Cdecl)]
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public static extern IntPtr zsv_get_cell_str(IntPtr parser, UIntPtr cellIndex);
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[DllImport(ZsvDll, CallingConvention = CallingConvention.Cdecl)]
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public static extern UIntPtr zsv_get_cell_len(IntPtr parser, UIntPtr cellIndex);
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[DllImport(CRT_LIB, CallingConvention = CallingConvention.Cdecl)]
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public static extern IntPtr fopen(string filename, string mode);
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[DllImport(CRT_LIB, CallingConvention = CallingConvention.Cdecl)]
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public static extern int fclose(IntPtr file);
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}
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class Program {
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static int lineCount = 0;
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static void OnRowParsed(IntPtr parser) {
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lineCount++;
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/** example code for printing the first cell of each row:
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UIntPtr cellCount = ZsvInterop.zsv_cell_count(parser);
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if (cellCount.ToUInt64() > 0) {
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// Index of the first cell
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UIntPtr cellIndex = new UIntPtr(0);
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// Get the pointer to the cell string
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IntPtr cellStrPtr = ZsvInterop.zsv_get_cell_str(parser, cellIndex);
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// Get the length of the cell string
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UIntPtr cellLen = ZsvInterop.zsv_get_cell_len(parser, cellIndex);
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// Convert the cell data to a string
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int length = (int)cellLen.ToUInt64();
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string cellValue = string.Empty;
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if (length > 0) {
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byte[] buffer = new byte[length];
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Marshal.Copy(cellStrPtr, buffer, 0, length);
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cellValue = System.Text.Encoding.UTF8.GetString(buffer);
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}
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Console.WriteLine($"Row {lineCount}: {cellValue}");
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}
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**/
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}
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static void Main(string[] args) {
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if (args.Length != 1) {
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Console.WriteLine("Usage: count-cs <csv_file_path>");
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return;
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}
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string csvFilePath = args[0];
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if (!File.Exists(csvFilePath)) {
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Console.WriteLine($"Error: File '{csvFilePath}' does not exist.");
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return;
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}
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IntPtr parser = ZsvInterop.zsv_new(IntPtr.Zero);
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if (parser == IntPtr.Zero) {
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Console.WriteLine("Failed to create zsv parser.");
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return;
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}
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ZsvInterop.ZsvRowHandler handler = new ZsvInterop.ZsvRowHandler(OnRowParsed);
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ZsvInterop.zsv_set_row_handler(parser, handler);
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ZsvInterop.zsv_set_context(parser, parser);
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// Open the file using fopen
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IntPtr file = ZsvInterop.fopen(csvFilePath, "r");
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if (file == IntPtr.Zero) {
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Console.WriteLine($"Error: Failed to open file '{csvFilePath}'.");
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ZsvInterop.zsv_delete(parser);
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return;
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}
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ZsvInterop.zsv_set_input(parser, file);
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int result = 0;
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while (result == 0) {
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result = ZsvInterop.zsv_parse_more(parser);
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}
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ZsvInterop.zsv_finish(parser);
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ZsvInterop.zsv_delete(parser);
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ZsvInterop.fclose(file);
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if (result != 2) // zsv_status_no_more_input
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{
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Console.WriteLine("Parsing failed: " + $"{result}");
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} else {
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Console.WriteLine($"{lineCount-1}");
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}
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}
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}

‎examples/c-sharp/count/count.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<PropertyGroup Condition="'$(RuntimeIdentifier)' == 'win-x64' Or '$(RuntimeIdentifier)' == 'win-x86'">
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<DefineConstants>WINDOWS</DefineConstants>
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</PropertyGroup>
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<PropertyGroup Condition="'$(RuntimeIdentifier)' == 'osx-x64' Or '$(RuntimeIdentifier)' == 'osx-arm64'">
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<DefineConstants>OSX</DefineConstants>
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</PropertyGroup>
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<PropertyGroup Condition="'$(RuntimeIdentifier)' == 'linux-x64' Or '$(RuntimeIdentifier)' == 'linux-arm64'">
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<DefineConstants>LINUX</DefineConstants>
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</PropertyGroup>
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</Project>
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