使用VSCode对Golang程序进行调试时会遇到数据截断问题，string只显示前64个字符，array只显示前64个数据。经查dlv是支持以参数方式来控制的。
发现VSCode的Golang插件里面有个叫做go.delveConfig的配置，是可以设置dlv参数的。分享一下我的整个Golang配置：
'go.buildOnSave': 'off', 'go.formatTool': 'goimports', 'go.lintTool': 'golangci-lint', //go get -u github.com/golangci/golangci-lint/cmd/golangci-lint 'go.autocompleteUnimportedPackages': true, 'go.gotoSymbol.includeImports': true, 'go.useLanguageServer': true, 'go.delveConfig': { 'dlvLoadConfig': { 'followPointers': true, 'maxVariableRecurse': 3, 'maxStringLen': 1024, 'maxArrayValues': 1024, 'maxStructFields': -1 }, }, '[go]': { 'editor.formatOnSave': true, 'editor.codeActionsOnSave': { 'source.organizeImports': true } },
需要改的主要是maxStringLen、maxArrayValues、maxVariableRecurse这三个字段。
参考：https://stackoverflow.com/questions/52416263/how-do-i-print-the-full-value-of-a-string-variable-in-delve
ps：下面看下Golang dlv 工具debug 调试注意项
总结一下关于Go 的调试工具dlv：https://github.com/derekparker/delve 的使用注意项。
安装：
go get -u github.com/go-delve/delve/cmd/dlv
配置：
以Centos为例
export GOROOT=/usr/lib/golangexport GOPATH=$HOME/goexport PATH=$PATH:$GOPATH/bin
使用
以某go服务为例：
dlv debug xxx.go 指定需要debug的文件 进入dlv交互式窗口后，b <filename>:<line> 指定断点 r arg 指定运行参数 n 执行一行 c 运行至断点或程序结束dlv debug /home/xxx/server.go(dlv) b /home/xxx/server.go:258(dlv) r 1(dlv) n(dlv) c
注意： b <filename>:<line> 指定断点时，若该行号对应的代码内容为无具体语义的代码（括号、注释等），则会报错：
Command failed: could not find /home/xxx/server.go:258
此时可用list 命令先查看上下文代码，避免将无具体语义的代码设为断点。
命令集
The following commands are available: args ------------------------ Print function arguments. break (alias: b) ------------ Sets a breakpoint. breakpoints (alias: bp) ----- Print out info for active breakpoints. call ------------------------ Resumes process, injecting a function call (EXPERIMENTAL!!!) clear ----------------------- Deletes breakpoint. clearall -------------------- Deletes multiple breakpoints. condition (alias: cond) ----- Set breakpoint condition. config ---------------------- Changes configuration parameters. continue (alias: c) --------- Run until breakpoint or program termination. deferred -------------------- Executes command in the context of a deferred call. disassemble (alias: disass) - Disassembler. down ------------------------ Move the current frame down. edit (alias: ed) ------------ Open where you are in $DELVE_EDITOR or $EDITOR exit (alias: quit | q) ------ Exit the debugger. frame ----------------------- Set the current frame, or execute command on a different frame. funcs ----------------------- Print list of functions. goroutine ------------------- Shows or changes current goroutine goroutines ------------------ List program goroutines. help (alias: h) ------------- Prints the help message. list (alias: ls | l) -------- Show source code. locals ---------------------- Print local variables. next (alias: n) ------------- Step over to next source line. on -------------------------- Executes a command when a breakpoint is hit. print (alias: p) ------------ Evaluate an expression. regs ------------------------ Print contents of CPU registers. restart (alias: r) ---------- Restart process. set ------------------------- Changes the value of a variable. source ---------------------- Executes a file containing a list of delve commands sources --------------------- Print list of source files. stack (alias: bt) ----------- Print stack trace. step (alias: s) ------------- Single step through program. step-instruction (alias: si) Single step a single cpu instruction. stepout --------------------- Step out of the current function. thread (alias: tr) ---------- Switch to the specified thread. threads --------------------- Print out info for every traced thread. trace (alias: t) ------------ Set tracepoint. types ----------------------- Print list of types up -------------------------- Move the current frame up. vars ------------------------ Print package variables. whatis ---------------------- Prints type of an expression.
总结
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