使用CheckMem.Pas单元进行内存泄漏检查

关键字：　内存泄漏　checkMem.pas

摘要：

　　这是一篇介绍如何使用CheckMem.pas单元检查delphi应用程序内存泄漏的文章

作者：999roseto347(fdaf at 163 dot com)

版本：V1.0

创建日期：2004-06-11

目录：

一、使用步骤

二、报告解读

三、测试例子

四、内存泄漏测试及修复的技巧

附：CheckMem.pas单元

一、使用步骤：

A)、将CheckMem.pas单元加入到工程中

B)、修改工程文件，将'CheckMem.pas'放到uses下的第一句

unit CheckMem; file://Add it to the first line of project uses

interface

procedure SnapCurrMemStatToFile(Filename: string);

implementation

uses
Windows, SysUtils, TypInfo;

const
MaxCount = High(Word);

var
OldMemMgr: TMemoryManager;
ObjList: array[0..MaxCount] of Pointer;
FreeInList: Integer = 0;
GetMemCount: Integer = 0;
FreeMemCount: Integer = 0;
ReallocMemCount: Integer = 0;

procedure AddToList(P: Pointer);
begin
if FreeInList > High(ObjList) then
begin
MessageBox(0, '内存管理监视器指针列表溢出，请增大列表项数！', '内存管理监视器', mb_ok);
Exit;
end;
ObjList[FreeInList] := P;
Inc(FreeInList);
end;

procedure RemoveFromList(P: Pointer);
var
I: Integer;
begin
for I := 0 to FreeInList - 1 do
if ObjList[I] = P then
begin
Dec(FreeInList);
Move(ObjList[I + 1], ObjList[I], (FreeInList - I) * SizeOf(Pointer));
Exit;
end;
end;

procedure SnapCurrMemStatToFile(Filename: string);
const
FIELD_WIDTH = 20;
var
OutFile: TextFile;
I, CurrFree, BlockSize: Integer;
HeapStatus: THeapStatus;
Item: TObject;
ptd: PTypeData;
ppi: PPropInfo;

procedure Output(Text: string; Value: integer);
begin
Writeln(OutFile, Text: FIELD_WIDTH, Value div 1024, ' KB(', Value, ' Byte)');
end;

begin
AssignFile(OutFile, Filename);
try
if FileExists(Filename) then
begin
Append(OutFile);
Writeln(OutFile);
end
else
Rewrite(OutFile);
CurrFree := FreeInList;
HeapStatus := GetHeapStatus; { 局部堆状态 }
with HeapStatus do
begin
Writeln(OutFile, '===== ', ExtractFileName(ParamStr(0)), ',', DateTimeToStr(Now), ' =====');
Writeln(OutFile);
Output('可用地址空间 : ', TotalAddrSpace);
Output('未提交部分 : ', TotalUncommitted);
Output('已提交部分 : ', TotalCommitted);
Output('空闲部分 : ', TotalFree);
Output('已分配部分 : ', TotalAllocated);
Output('全部小空闲内存块 : ', FreeSmall);
Output('全部大空闲内存块 : ', FreeBig);
Output('其它未用内存块 : ', Unused);
Output('内存管理器消耗 : ', Overhead);
Writeln(OutFile, '地址空间载入 : ': FIELD_WIDTH, TotalAllocated div (TotalAddrSpace div 100), '%');
end;
Writeln(OutFile);
Writeln(OutFile, Format('当前出现 %d 处内存漏洞 :', [GetMemCount - FreeMemCount]));
for I := 0 to CurrFree - 1 do
begin
Write(OutFile, I: 4, ') ', IntToHex(Cardinal(ObjList[I]), 16), ' - ');
BlockSize := PDWORD(DWORD(ObjList[I]) - 4)^;
Write(OutFile, BlockSize: 4, '($' + IntToHex(BlockSize, 4) + ')字节', ' - ');
try
Item := TObject(ObjList[I]);
if PTypeInfo(Item.ClassInfo).Kind <> tkClass then { type info technique }
write(OutFile, '不是对象')
else
begin
ptd := GetTypeData(PTypeInfo(Item.ClassInfo));
ppi := GetPropInfo(PTypeInfo(Item.ClassInfo), 'Name'); { 如果是TComponent }
if ppi <> nil then
begin
write(OutFile, GetStrProp(Item, ppi));
write(OutFile, ' : ');
end
else
write(OutFile, '(未命名): ');
Write(OutFile, Item.ClassName, ' (', ptd.ClassType.InstanceSize,
' 字节) - In ', ptd.UnitName, '.pas');
end
except
on Exception do
write(OutFile, '不是对象');
end;
writeln(OutFile);
end;
finally
CloseFile(OutFile);
end;
end;

function NewGetMem(Size: Integer): Pointer;
begin
Inc(GetMemCount);
Result := OldMemMgr.GetMem(Size);
AddToList(Result);
end;

function NewFreeMem(P: Pointer): Integer;
begin
Inc(FreeMemCount);
Result := OldMemMgr.FreeMem(P);
RemoveFromList(P);
end;

function NewReallocMem(P: Pointer; Size: Integer): Pointer;
begin
Inc(ReallocMemCount);
Result := OldMemMgr.ReallocMem(P, Size);
RemoveFromList(P);
AddToList(Result);
end;

const
NewMemMgr: TMemoryManager = (
GetMem: NewGetMem;
FreeMem: NewFreeMem;
ReallocMem: NewReallocMem);

initialization
GetMemoryManager(OldMemMgr);
SetMemoryManager(NewMemMgr);

finalization
SetMemoryManager(OldMemMgr);
if (GetMemCount - FreeMemCount) <> 0 then
SnapCurrMemStatToFile(ExtractFileDir(ParamStr(0)) + '\CheckMemory.Log');
end.