如何在MEX函数中读取整数数组 [英] how to read an integer array in MEX-function

问题描述

我正在将uint8类型的整数数组从MATLAB传递给MEX函数.如何读取这些值?我尝试使用:

I am passing an integer array of uint8 type from MATLAB to a MEX-function. How do I read these values? I tried using:

int *n;
n = (int * ) mxGetData(prhs[0]);

但这些值显示为垃圾.我也尝试过

but the values come out as junk. I also tried

double *n;
n= mxGetPr(prhs[0]);

，在这种情况下，也会出现垃圾值.

and in this case junk values also appear.

对此有什么解决方案?

基本上我想在MEX函数中读取整数值，但mxGetPr返回双精度类型.

Basically I want to read the integer value in the MEX-function but mxGetPr returns double type.

推荐答案

看一下演示MEX函数explorer.c，您可以使用MATLAB在pEX中打开它

Take a look at the demo MEX-function explore.c, which you can open in MATLAB using

edit([matlabroot '/extern/examples/mex/explore.c']);

在这里您会发现一堆函数，它们的名称都以analyze_开头，然后是类型(例如，analyze_uint8).在这些函数中，您将看到对mxGetData的调用的输出被强制转换为特定的C类型，如下所示:

In there you'll find a bunch of functions whose names all start with analyze_ and then a type (for example, analyze_uint8). In those functions you'll see the output of calls to mxGetData being cast to a particular C type, like this:

pr = (unsigned char *)mxGetData(array_ptr);

pr现在指向array_ptr的实部，即unsigned char的数组.

pr now points to the real part of array_ptr, an array of unsigned char.

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