在
Delphi,我通常写一个简单的泄漏测试,如下所示：
program MemLeak;
{$APPTYPE CONSOLE}
uses
SysUtils;
procedure Leak;
begin
{ Put leaking code here. }
end;
begin
ReportMemoryLeaksOnShutdown:= True;
try
Leak;
except
on E: Exception do
Writeln(E.ClassName,': ',E.Message);
end;
end.
解决方法
免费Pascal有类似的功能.在程序结束时,调用DumpHeap,或在Lazarus项目设置中启用heaptrc选项.输出文件可以使用SetHeapTraceOutput方法进行设置.这两种方法都在单位heaptrc中,它必须是项目中的第一个(从开始捕获分配).
更多信息：
> http://www.freepascal.org/docs-html/rtl/heaptrc/usage.html
> http://www.freepascal.org/docs-html/rtl/heaptrc/environment.html
泄漏可视化：Lazarus软件包“LeakView”在树视图中显示堆跟踪输出文件的内容.它被包含在默认安装中,并且在重建IDE之后可用. (尚未测试)
// By default information is written to standard output,// this function allows you to redirect the information to a file
SetHeapTraceOutput('heaptrace.log');
// normally the heap dump will be written automatically at the end,// but can also be written on demand any time
DumpHeap;
输出如下：
C:\path\to\Demo.exe Heap dump by heaptrc unit 244 memory blocks allocated : 8305/9080 241 memory blocks freed : 8237/9000 3 unfreed memory blocks : 68 True heap size : 458752 True free heap : 458288 Should be : 458480 Call trace for block $0010CE58 size 28 $0044ACCB TIDTHREADSAFE__CREATE,line 226 of C:/path/to/indy-10.5.8.tiburon/Lib/Core/IdThreadSafe.pas $00444245 IDTHREAD_init,line 641 of C:/path/to/indy-10.5.8.tiburon/Lib/Core/IdThread.pas $00409D74 $0040E1A1 ...
(用Free Pascal 2.6.0测试)