VC/C#中使用相同代码的结果不同 [英] Different result with same code in VC/C#
问题描述
VC ++中的这段代码返回了正确的结果
char proSrc [] ="+ proj = cass + ellps = bessel + lat_0 = 43d19 \ '05 .727 \" N"+ lon_0 = 11d19 \ '55 .9583 \"E" + towgs84 [-104.1，-49.1，-9.9,0.971，-2.917,0.714，-11.68]"；
char proDst [] ="+ proj = latlong + datum = WGS84 + towgs84 [-104.1，-49.1，-9.9,0.971，-2.917,0.714，-11.68]";
项目空间；
space.v = 150000;
space.u = -150000;
projPJ projSrc = pj_init_plus(proSrc);
projPJ projDst = pj_init_plus(proDst);
space = pj_inv(space，projSrc);
double x = space.u;
double y = space.v;
double z = 0;
double ris = pj_transform(projSrc，projDst，1，0，& x，& y，& z);
...现在我已将代码导入C#中，如下所示:
不安全的类程序
{
公共结构项目
{
公共双人u;
公共双重v;
}
[DllImport(@"C:\ Users \ t \ Desktop \ Lib \ proj.dll"，CallingConvention = CallingConvention.Cdecl， EntryPoint ='_ plus )]
静态外部void * pj_init_plus(string m);
[DllImport(@"C:\ Users \ t \ Desktop \ Lib \ proj.dll"，CallingConvention = CallingConvention.Cdecl，CharSet = CharSet.Auto，&EntbPoint = ="pj_inv"))]
静态外部projUV pj_inv(projUV px，void * py);
[DllImport(@"C:\ Users \ t \ Desktop \ Lib \ proj.dll"，EntryPoint ="pj_transform"，CallingConvention = CallingConvention.Cdecl)]
静态外部int pj_transform(void * src，void * dst，long point_count，int point_offset， b ;
double * x，double * y，double * z);
静态void Main(string [] args)
{
字符串proSrc = @"+ proj = cass + ellps = bessel + lat_0 = 43d19'05.727"" + lon_0 = 11d19'55.9583"""E"；
字符串proDst ="+ proj = latlong + datum = WGS84 + towgs84 [-104.1，-49.1，-9.9,0.971，-2.917,0.714，-11.68]";
void * projSrc = pj_init_plus(proSrc);
void * projDst = pj_init_plus(proDst);
项目空间；
space.v = 15000;
space.u = -15000;
space = pj_inv(space，projSrc);
double x = space.u;
y = space.v;
双z = 0.0;
double ris = pj_transform(projSrc，projDst，1，0，& x，& y，& z);
}
}
但现在最后调用的函数是"ris = pj_transform(projSrc，projDst，1，0，& x，& y，& z);"返回一个错误:尝试读取或写入受保护的内存.这通常表明其他内存已损坏.
我认为pj_init_plus(proSrc)中传递的字符串的编组可能是问题的原因，但我不知道如何解决...
有人可以帮助我吗?
提前谢谢，
古顿
这是程序原型
projLP pj_inv(projXY，projPJ);
int pj_transform(projPJ src，projPJ dst，long point_count，int point_offset，
] double * x，double * y，double * z);
projPJ pj_init_plus(const char *);
p.s.对不起，我的英语
Hi,
this code in VC++ return me correct result
char proSrc[] = "+proj=cass +ellps=bessel +lat_0=43d19\'05.727\"N"" +lon_0=11d19\'55.9583\"E"" +towgs84[-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68]";
char proDst[]="+proj=latlong +datum=WGS84 +towgs84[-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68]";
projUV space;
space.v = 150000;
space.u = -150000;
projPJ projSrc = pj_init_plus(proSrc);
projPJ projDst = pj_init_plus(proDst);
space=pj_inv(space, projSrc);
double x=space.u;
double y=space.v;
double z=0;
double ris = pj_transform(projSrc, projDst, 1, 0, &x, &y, &z);
...now I have imported this code in C# as follow:
unsafe class Program
{
public struct projUV
{
public double u;
public double v;
}
[DllImport(@"C:\Users\t\Desktop\Lib\proj.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "pj_init_plus")]
static extern void* pj_init_plus(string m);
[DllImport(@"C:\Users\t\Desktop\Lib\proj.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Auto, EntryPoint = "pj_inv")]
static extern projUV pj_inv(projUV px, void* py);
[DllImport(@"C:\Users\t\Desktop\Lib\proj.dll", EntryPoint = "pj_transform", CallingConvention = CallingConvention.Cdecl)]
static extern int pj_transform(void* src, void* dst, long point_count, int point_offset,
double* x, double* y, double* z);
static void Main(string[] args)
{
string proSrc = @"+proj=cass +ellps=bessel +lat_0=43d19'05.727""N +lon_0=11d19'55.9583""E";
string proDst="+proj=latlong +datum=WGS84 +towgs84[-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68]";
void* projSrc = pj_init_plus(proSrc);
void* projDst = pj_init_plus(proDst);
projUV space;
space.v = 15000;
space.u = -15000;
space = pj_inv(space, projSrc);
double x = space.u;
double y = space.v;
double z = 0.0;
double ris = pj_transform(projSrc, projDst, 1, 0, &x, &y, &z);
}
}
but now last called function "ris = pj_transform(projSrc, projDst, 1, 0, &x, &y, &z);" return me an error:Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
I think that marshalling of string passed in pj_init_plus(proSrc) maybe the cause of problem but I don't understand how solve...
anyone can help me?
Thanks in advance,
Guton
this is the procedure prototypes
projLP pj_inv(projXY, projPJ);
int pj_transform( projPJ src, projPJ dst, long point_count, int point_offset,
double *x, double *y, double *z );
projPJ pj_init_plus(const char *);
p.s. sorry for my english
推荐答案
为什么在C ++中使用projPJ但在C#中使用void *?为什么不在C#中也使用实际类型呢?空指针是弄碎东西的好方法.
Why do you use a projPJ in C++ but a void* in C#? Why not use the actual type in C# as well? Void pointers are a good way to get stuff broken.
您的projPJ结构/类实际上是什么样的?
What does your projPJ structure/class actually look like?
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