C ++ checks for Memory leakage

Note: The ide I use is vs2008 1. the project is set to debug Memory leakage detection generally in debug mode 2. add [cpp] # ifdef _ DEBUG # define _ CRTDBG_MAP_ALLOC # include <stdlib. h> # include <crtdbg. h> # define new (_ NORMAL_BLOCK, _ FILE __, _ LINE _) # endif 3. insert such a sentence into the code: EnableMemLeakCheck (); [cpp] inline void EnableMemLeakCheck () {_ CrtSetDbgFlag (_ CRTDBG_REPORT_FLAG) | _ timeout);} 4. then we can see the leakage in the output. For example, I use the newEx table. New [cpp] int _ tmain (int argc, _ TCHAR * argv []) {EnableMemLeakCheck (); int num = 10; byte ** p = newEx byte * [num]; for (int I = 0; I <num; I ++) {Sleep (1 ); * p = newEx byte [I];} long * pl = newEx long [100]; while (1) {Sleep (100);} return 0 ;} the content displayed in the output (run the program in debug, and then close the program with a cross-fork) memory leaks! Dumping objects-> e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (101): {124} normal block at 0x00295CB8, 400 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92 ): {122} normal block at 0x00294C30, 9 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_me M_leak.cpp (92): {121} normal block at 0x00294BE8, 8 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): {120} normal block at 0x00299F88, 7 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): {119} normal block at 0x00299F40, 6 bytes long. data: <> CD e: \ project \ Test \ test_mem_leak \ test_mem_leak.cpp (92): {118} normal block at 0x00299EF8, 5 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): {117} normal block at 0x00299EB8, 4 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): {116} normal block at 0x00299E78, 3 bytes long. data: <> CD CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92) :{ 115} normal block at 0x00299E38, 2 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): {114} normal block at 0x00299DF8, 1 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): {113} normal block at 0x00299DB8, 0 bytes long. data: <> p e: \ proj Ect \ test \ test_mem_leak \ test_mem_leak.cpp (88): {112} normal block at 0x00299D50, 40 bytes long. data: <0L)> 30 4C 29 00 CD Object dump complete. the file name and row number are available. Apply for the file first and then release it. Extension: another new is used in dbgnew. [cpp] void * _ CRTDECL operator new [] (size_t cb, int nBlockUse, const char * szFileName, int nLine) _ THROW1 (_ STD bad_alloc) {void * res = operator new (cb, nBlockUse, szFileName, nLine); RTCCALLBACK (_ RTC_Allocate_hook, (res, cb, 0 )); return res;} note that the const char * szFileName can use _ file _ or a custom class, which is overloaded as char * (thanks to the old horse for providing Code). For example: [cpp] char new_index_recorder_file_name [1 024*1024] [256]; class new_index_recorder {public: new_index_recorder (char * file, int line): file (file), line (line) {} operator char *() {static unsigned int index; sprintf (new_index_recorder_file_name [index], "% s (% d): % d", file, line, index ++ ); return new_index_recorder_file_name [index];} private: char * file; int line ;}; Of course, you can also use a function to return the char * pointer [cpp] int g_count = 0; class OperNew {public: OperN Ew () {g_count ++; pC = new char [20]; memset (pC, 0, 10); sprintf (pC, "No. % d ", g_count);} char * GetChar () {return pC;} private: char * pC;}; then you can return custom content. In this return, a sequence number is added during the construction, and the time can also be added. Results: e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (95): 11 (95): {123} normal block at 0x002B4C78, 400 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_leak \ test_mem_leak.cpp (92): 10 (92) :{ 122} normal block at 0x002B4C30, 9 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ tes T_mem_leak.cpp (92): 9 (92): {121} normal block at 0x002B4BE8, 8 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): 8 (92 ): {120} normal block at 0x002B9F88, 7 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): 7 (92): {119} normal block at 0x002B9F40, 6 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): 6 (92): {118} normal block at 0x002B9EF8, 5 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): 5 (92): {117} normal block at 0x002B9EB8, 4 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): 4 (92) :{ 116} Normal block at 0x002B9E78, 3 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): 3 (92): {115} normal block at 0x002B9E38, 2 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (92): 2 (92): {114} normal block at 0x002B9DF8, 1 bytes long. data: <> CD e: \ project \ test \ test_mem_leak \ test_mem_leak.c Pp (92): 1 (92): {113} normal block at 0x002B9DB8, 0 bytes long. data: <> h e: \ project \ test \ test_mem_leak \ test_mem_leak.cpp (88): 0 (88): {112} normal block at 0x002B9D50, 40 bytes long. data: <0L +> 30 4C 2B 00 CD Object dump complete. the program "[8796] test_MEM_LEAK.exe: Local Computer" has exited and the returned value is-1073741510 (0xc000013a ). Tip: copy the output file to the UE, and then find the number of times the leaked row number appears. You can calculate the number of leaks.