Visual C ++和大型2d数组 [英] Visual C++ and large 2d arrays
问题描述
大家好，
我已经制作了一个2d动态数组，如下所示（这是一个片段，所以并非所有的
变量都被计算在内） ：
// numvoices是动态的（1-1000），由用户输入
// MAXCHANNELS目前被定义为24
float ** gvoiceSpat;
float ** notechannelGain;
float ** notechannelGainSpread;
gvoiceSpat = new float * [numvoices];
notechannelGain = new float * [numvoices];
notechannelGainSpread = new float * [numvoices];
for（i = 0; i< numvoices; i ++）
{
gvoiceSpat [i] = new float [MAXCHANNELS];
notechannelGain [i] = new float [MAXCHANNELS];
notechannelGainSpread [i] = new float [MAXCHANNELS];
}
有趣的是，这段代码在gcc中完美无缺，但是在
Visual C ++（2003 .NET）中，当数字超过〜120时，程序
崩溃，有时候报告未知的例外。问题是
这是另一个应用程序的外部模块的代码，并使用
额外的第三方库，因此很难指出
罪魁祸首。然而，事实仍然是这种崩溃只发生在使用Visual C ++的Windows
上，而它在使用相同的库的OSX（gcc）和Linux
（gcc）上完美运行。
关于为什么会出现这种情况的任何想法？
对于它的价值，我也尝试用向量代替这些与
没有任何区别。
非常感谢任何帮助！
此致，
Ico
Hi all,
I''ve made a 2d dynamic array as follows (this is a snippet so not all
variables are accounted for):
//numvoices are dynamic (1-1000), entered by user
//MAXCHANNELS is currently defined as 24
float **gvoiceSpat;
float **notechannelGain;
float **notechannelGainSpread;
gvoiceSpat = new float *[numvoices];
notechannelGain = new float *[numvoices];
notechannelGainSpread = new float *[numvoices];
for (i = 0; i < numvoices; i++)
{
gvoiceSpat[i] = new float[MAXCHANNELS];
notechannelGain[i] = new float[MAXCHANNELS];
notechannelGainSpread[i] = new float[MAXCHANNELS];
}
The interesting thing is that this code works flawlessly in gcc but in
Visual C++ (2003 .NET) whenever numvoices exceeds ~120, the program
crashes, sometimes reporting unknown exception. The problem is that
this is a code for an external module for another application and uses
additional third-party libs so it is difficult to point fingers at the
culprit. Yet, the fact remains that this crash occurs only on Windows
using Visual C++, while it works flawlessly on OSX (gcc) and Linux
(gcc) using same libs.
Any ideas as to why would this be the case?
For what it''s worth, I also tried substituting these with vectors with
no difference whatsoever.
Any help is most appreciated!
Sincerely,
Ico
推荐答案
On 5/2/07 6:44 PM，文章
11 *** *******************@n76g2000hsh.googlegroups。 com ，
" ic ******** @ gmail.com" < ic ******** @ gmail.comwrote：
On 5/2/07 6:44 PM, in article
11**********************@n76g2000hsh.googlegroups. com,
"ic********@gmail.com" <ic********@gmail.comwrote:
我已经制作了一个2d动态数组，如下所示（这是一个片段，所以不是所有
变量都计入）：
// numvoices是动态的（1-1000），由用户输入
/ / MAXCHANNELS目前被定义为24
float ** gvoiceSpat;
float ** notechannelGain;
float ** notechannelGainSpread;
gvoiceSpat = new float * [numvoices];
notechannelGain = new float * [numvoices];
notechannelGainSpread = new float * [numvoices];
for（i = 0; i< numvoices; i ++）
{
gvoiceSpat [i ] = new float [MAXCHANNELS];
notechannelGain [i] = new float [MAXCHANNELS];
notechannelGainSpread [i] = new float [MAXCHANNELS];
}
有趣的是，这个代码在gcc中完美无缺，但是只要数字超过〜120，就可以在
Visual C ++（2003 .NET）中运行，th e程序
崩溃，有时报告未知异常。问题是
这是另一个应用程序的外部模块的代码，并使用
额外的第三方库，因此很难指出
罪魁祸首。然而，事实仍然是这种崩溃只发生在使用Visual C ++的Windows
上，而它在使用相同的库的OSX（gcc）和Linux
（gcc）上完美运行。
关于为什么会出现这种情况的任何想法？
I''ve made a 2d dynamic array as follows (this is a snippet so not all
variables are accounted for):
//numvoices are dynamic (1-1000), entered by user
//MAXCHANNELS is currently defined as 24
float **gvoiceSpat;
float **notechannelGain;
float **notechannelGainSpread;
gvoiceSpat = new float *[numvoices];
notechannelGain = new float *[numvoices];
notechannelGainSpread = new float *[numvoices];
for (i = 0; i < numvoices; i++)
{
gvoiceSpat[i] = new float[MAXCHANNELS];
notechannelGain[i] = new float[MAXCHANNELS];
notechannelGainSpread[i] = new float[MAXCHANNELS];
}
The interesting thing is that this code works flawlessly in gcc but in
Visual C++ (2003 .NET) whenever numvoices exceeds ~120, the program
crashes, sometimes reporting unknown exception. The problem is that
this is a code for an external module for another application and uses
additional third-party libs so it is difficult to point fingers at the
culprit. Yet, the fact remains that this crash occurs only on Windows
using Visual C++, while it works flawlessly on OSX (gcc) and Linux
(gcc) using same libs.
Any ideas as to why would this be the case?
可能是在Windows上，numvoices是一个字符 - 当数字的值超过128并且溢出时，程序是
崩溃？
Greg
Could it be that on Windows numvoices is a char - and the program is
crashing when numvoices'' value exceeds 128 and overflows?
Greg
关于为什么会出现这种情况的任何想法？
Any ideas as to why would this be the case?
可能是Windows上的numvoices是一个字符 - 而且当numvoices的值超过128并且溢出时程序是
崩溃？
Greg
Could it be that on Windows numvoices is a char - and the program is
crashing when numvoices'' value exceeds 128 and overflows?
Greg
不知道。如何测试和/或减轻它？
Ico
No idea. How can this be tested and/or alleviated?
Ico
实际上，经过仔细检查，天花板似乎会移动很多
和优化代码确实增加了它（没有代码优化它
徘徊在90左右，并且通过完全优化它可以达到120或
so）。
Ico
Actually, upon closer inspection, the ceiling appears to shift a lot
and optimizing code does increase it (without code optimization it
hovers around 90, and with full optimization it can get up to 120 or
so).
Ico
这篇关于Visual C ++和大型2d数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
