README

lazarus_callback_go

Use pascal callback function to get Golang CGO function to Process in Lazarus.

Purpose

Golang lacks powerful extension library support in the GUI and is more familiar with using Lazarus to complete the graphical interface.

Thinking

Define a CallBackFunc function, which is referenced from the CGO compiled extension library and defined as follows:

procedure CallBackFunc(_para1: longint; p0: intFunc); cdecl; external LIBGO_NAME;

Use the Pascal Callback method to call the Golang extension method for processing, for example:

CallBackFunc(1, @FFCallbackForForm);

Where "1" is the incoming parameter, FFCallbackForForm is a callback function, and the function declaration is as follows:

intFunc = procedure(_para1: longint); cdecl;

The parameter _para1 returned by the callback function is the result of Go processing, and then processed by Pascal output to the interface.

procedure FFCallbackForForm(rev:longint); cdecl; // stdcall;
begin
  frmMain.Memo1.Lines.Add('Go Result = ' + inttostr(rev));
end;

Problem: Cannot declare the Callback function available to Lazarus dire

Problems in the writingctly via Go

Solved: Using CGO, using C and Pascal bridging, then Go to process

Problem: Problems with cross-platform compilation Solution: Ensure that Lazarus, Go, GCC are all the same architecture

Project Test

Before testing, you need to ensure that Lazarus, Go, and GCC are installed correctly in the same architecture

Clone project

Execute the command line git clone https://github.com/GoLazarus/lazarus_callback_go.git

Compiled

cd lazarus_callback_go && make

Use

Double-click on the executable file to see the result of Lazarus calling Go processing

Discuss

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Reference

• Lazarus Cross compiling
• Golang cgo
• Lazarus and Call back function