传递给lmdif1的第二个和第三个参数是整数,对于我的测试,顺序中的值是12和9.现在当它们在C代码中时,12的值现在是9而9的值在308000之间变化和912000.不知道为什么.

首先,我想知道我使用的签名是否有效

C#签名：

[DllImport("cminpack_dll.dll",CallingConvention = CallingConvention.Cdecl)]
public static extern int lmdif1(IntPtr fcn,int m,int n,double[] x,double[] fVec,double tol,int[] iwa,double[] wa,int lwa);

C签名：

int __cminpack_func__(lmdif1)(__cminpack_decl_fcn_mn__ void *p,real *x,real *fvec,real tol,int *iwa,real *wa,int lwa)

我称之为：

//All of the variables passed in match the types in C# signature above.
var info =lmdif1(
            functionPointer,pointsetLength,initialGuessLength,initialGuess,fVec,tol,iwa,wa,lwa);

现在这是我第一次与PInvoke打交道,而我的C并不好,之前从未真正做过,所以任何帮助都会很棒.我怀疑我可能需要制造一些东西,但我已经尝试过将I4和U4作为整体进行编组,它仍然会做同样的事情.

为你的帮助提前干杯.

编辑：
以下是描述C函数的注释,如果有帮助：

/*     ********** */
 
/*     subroutine lmdif1 */
 
/*     the purpose of lmdif1 is to minimize the sum of the squares of */
/*     m nonlinear functions in n variables by a modification of the */
/*     levenberg-marquardt algorithm. this is done by using the more */
/*     general least-squares solver lmdif. the user must provide a */
/*     subroutine which calculates the functions. the jacobian is */
/*     then calculated by a forward-difference approximation. */
 
/*     the subroutine statement is */
 
/*       subroutine lmdif1(fcn,m,n,x,fvec,info,lwa) */
 
/*     where */
 
/*       fcn is the name of the user-supplied subroutine which */
/*         calculates the functions. fcn must be declared */
/*         in an external statement in the user calling */
/*         program,and should be written as follows. */
 
/*         subroutine fcn(m,iflag) */
/*         integer m,iflag */
/*         double precision x(n),fvec(m) */
/*         ---------- */
/*         calculate the functions at x and */
/*         return this vector in fvec. */
/*         ---------- */
/*         return */
/*         end */
 
/*         the value of iflag should not be changed by fcn unless */
/*         the user wants to terminate execution of lmdif1. */
/*         in this case set iflag to a negative integer. */
 
/*       m is a positive integer input variable set to the number */
/*         of functions. */
 
/*       n is a positive integer input variable set to the number */
/*         of variables. n must not exceed m. */
 
/*       x is an array of length n. on input x must contain */
/*         an initial estimate of the solution vector. on output x */
/*         contains the final estimate of the solution vector. */
 
/*       fvec is an output array of length m which contains */
/*         the functions evaluated at the output x. */
 
/*       tol is a nonnegative input variable. termination occurs */
/*         when the algorithm estimates either that the relative */
/*         error in the sum of squares is at most tol or that */
/*         the relative error between x and the solution is at */
/*         most tol. */
 
/*       info is an integer output variable. if the user has */
/*         terminated execution,info is set to the (negative) */
/*         value of iflag. see description of fcn. otherwise,*/
/*         info is set as follows. */
 
/*         info = 0  improper input parameters. */
 
/*         info = 1  algorithm estimates that the relative error */
/*                   in the sum of squares is at most tol. */
 
/*         info = 2  algorithm estimates that the relative error */
/*                   between x and the solution is at most tol. */
 
/*         info = 3  conditions for info = 1 and info = 2 both hold. */
 
/*         info = 4  fvec is orthogonal to the columns of the */
/*                   jacobian to machine precision. */
 
/*         info = 5  number of calls to fcn has reached or */
/*                   exceeded 200*(n+1). */
 
/*         info = 6  tol is too small. no further reduction in */
/*                   the sum of squares is possible. */
 
/*         info = 7  tol is too small. no further improvement in */
/*                   the approximate solution x is possible. */
 
/*       iwa is an integer work array of length n. */
 
/*       wa is a work array of length lwa. */
 
/*       lwa is a positive integer input variable not less than */
/*         m*n+5*n+m. */
 
/*     subprograms called */
 
/*       user-supplied ...... fcn */
 
/*       minpack-supplied ... lmdif */
 
/*     argonne national laboratory. minpack project. march 1980. */
/*     burton s. garbow,kenneth e. hillstrom,jorge j. more */
 
/*     ********** */
 
/*     check the input parameters for errors. */