qt内存分配失败怎么解决

内存分配失败可能是由于以下原因导致的：

1. 内存不足：系统中可用内存已经被使用完，无法满足新的内存分配请求大厅银。

2. 内存泄漏：程序中存在未释放的内存，导致可用内存逐渐减少，最终导致内存分配失败。

3. 内存碎片：由于频繁的内存分配和释放，导致内存中存在大量的零散空间，无法满足连续的内存分配请求。

针对内存分配失败问题，可以尝试以下解决方法：

1. 优化程序，避免内存泄漏，释放不伏好需要的内存。

2. 增加系统内存，确保系统有足够的内存供程序使用。

3. 使用内存池技术，预先分配一滚宴定数量的内存块，避免频繁的内存分配和释放，减少内存碎片。

4. 调整程序的内存分配策略，避免一次分配过多的内存，可以采用分块分配的方式，分多次进行内存分配。

最近在Qt项缺拆目中发现,程序运行内存越来越大,然后使用_CrtDumpMemoryLeaks进行内存检查,发现很多泄漏提示,但是检查代码没发现问题.

于是使用VS2010 创建了一个Qt console程序,代码如下,

#include <QtCore/QCoreApplication>

#include <assert.h>

/************************************************************************/

#ifdef _DEBUG

#define _CRTDBG_MAP_ALLOC

#include <crtdbg.h>

#define DEBUG_CLIENTBLOCK new( _CLIENT_BLOCK, FILE, LINE)

#define new DEBUG_CLIENTBLOCK

static void Exit()

{ int i = _CrtDumpMemoryLeaks()assert( i == 0)

}

#define CheckMemoryLeaks() {atexit(Exit)}

#else

#define DEBUG_CLIENTBLOCK

#define CheckMemoryLeaks() ；

#endif

/************************************************************************/

int main(int argc, char *argv[])

{ CheckMemoryLeaks()QCoreApplication a(argc, argv)

return a.exec()}

===========================================================================

输出信息如下:

Detected memory leaks!

Dumping objects ->

{176} normal block at 0×013A57F0, 12 bytes long. Data: <L ]L ]>00 00 00 00 4C CF 1C 5D 4C CF 1C 5D

{175} normal block at 0×013A57A8, 12 bytes long. Data: <L ]L ]>00 00 00 00 4C CF 1C 5D 4C CF 1C 5D

{174} normal block at 0×013A56F8, 112 bytes long. Data: <] V: L ]>8C CB 1B 5D B0 56 3A 01 00 00 00 00 4C CF 1C 5D

{173} normal block at 0×013A56B0, 8 bytes long. Data: <] V: >98 CB 1B 5D F8 56 3A 01

{172} normal block at 0×013A5670, 4 bytes long. Data: <L ]>4C CF 1C 5D

{171} normal block at 0×013A5620, 20 bytes long. Data: <@ ]@ ]@ ]@ ]>40 20 1C 5D 40 20 1C 5D 40 20 1C 5D 40 20 1C 5D

{170} normal block at 0×013A55E0, 4 bytes long. Data: <@ ]>40 20 1C 5D

{156} normal block at 0×013A5530, 16 bytes long. Data: <>慎枝 01 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00

{155} normal block at 0×013A54F0, 4 bytes long. Data: <0U: >30 55 3A 01

{154} normal block at 0×013A5288, 552 bytes long. Data: <伏孝枣 R: >83 00 00 00 83 00 00 00 98 52 3A 01 CD CD CD CD

{151} normal block at 0×013A50D8, 108 bytes long. Data: <] P: L ]>E8 B9 1B 5D 90 50 3A 01 00 00 00 00 4C CF 1C 5D

{150} normal block at 0×013A5090, 8 bytes long. Data: <] P: >A8 B9 1B 5D D8 50 3A 01

{149} normal block at 0×013A5018, 60 bytes long. Data: <P: >02 00 00 00 90 50 3A 01 FC 1B 00 00 00 CD CD CD

{145} normal block at 0×013A4E58, 32 bytes long. Data: <>01 00 00 00 04 00 00 00 00 00 00 00 01 00 00 00

{144} normal block at 0×013A4E08, 20 bytes long. Data: <4)] \5] \5]( 1]>BC 34 29 5D F0 5C 35 5D 90 5C 35 5D 28 82 31 5D

{143} normal block at 0×013A4DC8, 4 bytes long. Data: <XN: >58 4E 3A 01

{142} normal block at 0×013A4D78, 16 bytes long. Data: <>01 CD CD CD 00 00 00 00 00 00 00 00 00 00 00 00

{141} normal block at 0×013A4D38, 4 bytes long. Data: <xM: >78 4D 3A 01

Object dump complete.

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