Detecting memory leaks in VCs

Disclaimer: Checkleaks.h and checkleaks.cpp The code in these two files is copied online, but the original site is not found now

Therefore, this article is not completely original, hehe.

Just think of it as an archive.

First on the code:

[CPP]View Plaincopyprint?

2. Checkleaks.h
4. #ifndef Set_debug_new_h
6. #define Set_debug_new_h
10. #ifdef _DEBUG
12. #define Debug_clientblock New (_client_block, __file__, __line__)
14. #else
16. #define Debug_clientblock
18. #endif
22. #define _crtdbg_map_alloc
24. #include <crtdbg.h>
28. #ifdef _DEBUG
30. #define NEW Debug_clientblock
32. #endif
36. #pragma once
40. #if defined (WIN32)
42. void Setfilterdebughook (void);
44. #endif
48. #endif
54. Checkleaks.cpp
56. #if defined (WIN32)
60. #include <string.h>
62. #include "crtdbg.h"
66. #define FALSE 0
68. #define TRUE 1
72. _crt_report_hook Prevhook;
76. int Reportinghook (int reporttype, char* usermessage, int* retVal)
78. {
80. //This function was called several times for each memory leak.
82. //Each time a part of the error message is supplied.
84. //This holds number of subsequent detail messages after
86. //A leak was reported
88. const int numfollowupdebugmsgparts = 2;
90. static bool ignoremessage = false;
92. static int debugmsgpartscount = 0;
96. //Check if the memory leak reporting starts
98. if (strncmp (usermessage,"detected memory leaks!/n", ten) = = 0)
100. || Ignoremessage)
102. {
104. //Check if the memory leak reporting ends
106. if (strncmp (usermessage,"Object dump complete./n", ten) = = 0)
108. {
110. _CrtSetReportHook (Prevhook);
112. Ignoremessage = false;
114. } Else
116. Ignoremessage = true;
120. //Something from our own code?
122. if (strstr (Usermessage, ". cpp") = = NULL)
124. {
126. if (debugmsgpartscount++ < numfollowupdebugmsgparts)
128. //Give it back to _CrtDbgReport () to being printed to the console
130. return FALSE;
132. Else
134. return TRUE; //Ignore it
136. } Else
138. {
140. Debugmsgpartscount = 0;
142. //Give it back to _CrtDbgReport () to being printed to the console
144. return FALSE;
146. }
148. } Else
150. //Give it back to _CrtDbgReport () to being printed to the console
152. return FALSE;
154. };
158. void Setfilterdebughook (void)
160. {
162. //change the "report function" to "Report memory leaks " from program code
164. Prevhook = _CrtSetReportHook (Reportinghook);
166. }
170. #endif
176. Main.cpp
178. #include <windows.h>
180. #include <stdio.h>
182. #include "Checkleaks.h"
186. int main ()
188. {
190. //Be sure to add this sentence and have the report output in debug mode
192. _CrtSetDbgFlag (_CRTDBG_ALLOC_MEM_DF | _crtdbg_leak_check_df);
194. int *arr;
196. arr = new int;
198. return 0;
200. }

Program output:

[CPP]View Plaincopyprint?

1. Detected memory leaks!
2. Dumping objects
3. E:\vs2008\Try\ctemp\ctemp\main.cpp (9): {$} client block at 0x00503de8, subtype 0, 4 bytes long.
4. Data: < > CD CD CD
5. Object dump complete.
6. The program ' [3348] ctemp.exe:Native ' have exited with code 0 (0x0).

http://blog.csdn.net/small_qch/article/details/6856445

Detecting memory leaks in VCs