使用PowerBuilder 10.0调用DLL的外部函数错误

Question

我创建了一个使用Visual C++ 2008创建两个外部函数的DLL。使用python我创建了两个独立的可执行函数来运行这些函数。当使用PowerBuilder调用函数时，第一个可执行文件运行良好。第二个可执行文件导致运行时错误：error calling external function %s。我使用.def文件，并为每个功能准备了正确的序号。有什么建议？

在C中的函数声明如下（对不起它们相当长）：

extern "C" int __stdcall start_proctor(double points[], double weights[], double opoints[], double &SG, char sg_estimated[], double &smooth, char ptitle[], double &pheight, double &pwidth, char save_location[], int &show, int &ZV, char roundM[], char roundD[], int &zoom, char cwd[], int &x_scale_major_tick,int &y_scale_major_tick, char points_of[], char points_color[], char points_type[], int &points_size, char curve_of[], char curve_color[], int &curve_alpha, int &curve_size, char grid_of[], char grid_color[], int &grid_alpha, int &grid_x_dash, int &grid_y_dash, char opt_of[], char opt_color[], int &opt_alpha, int &opt_x_dash, int &opt_y_dash, int &x_scale_major_tick_c, int &y_scale_major_tick_c, char points_of_c[], char points_color_c[], char points_type_c[], int &points_size_c, char curve_of_c[], char curve_color_c[], int &curve_alpha_c, int &curve_size_c, char grid_of_c[], char grid_color_c[], int &grid_alpha_c, int &grid_x_dash_c, int &grid_y_dash_c, char opt_of_c[], char opt_color_c[], int &opt_alpha_c, int &opt_x_dash_c, int &opt_y_dash_c, int &return_default, int &splash, double &optmoisture, double &maxdd, double &percent_oversized, double &o_SG , double &o_moisture, double &o_optmoisture, double &o_maxdd, int &oversized_flag, int &debug, char c_output[]); 

extern "C" int __stdcall start_grain_size(char dsn_name[], char userID[], char passwd[], double test_data[], int &td_length, double upper_bound[], int &ub_length, double lower_bound[], int &lb_length, char envelope[], char specification[], char pointmarker[], char splinemarker[], char display[], char scale[], char units[], char xlabel[], char direction[], char maximum_density_line[], int &pan, char title[], char save_location[], char cwd[], int &show, double &width, double &height, char output[]); 

在PowerBuilder外部函数声明是：

Function int start_proctor(ref double points[3,8], ref double weigthts[8], ref double opoints[3,8], ref double sg, ref string sg_estimated, ref double smooth, ref string ptitle, ref double pheight, ref double pwidth, ref string save_location, ref int show, ref int zv, ref string roundm, ref string roundd, ref int zoom, ref string cwd, ref int li_x_scale_major_tic, ref int li_y_scale_major_tic, ref string ls_points_of, ref string ls_points_color, ref string ls_points_type, ref int li_points_size, ref string ls_curve_of, ref string ls_curve_color, ref int li_curve_alpha, ref int li_curve_size, ref string ls_grid_of, ref string ls_grid_color, ref int li_grid_alpha, ref int li_grid_x_dash, ref int li_grid_y_dash, ref string ls_opt_of, ref string ls_opt_color, ref int li_opt_alpha, ref int li_opt_x_dash, ref int li_opt_y_dash, ref int li_x_scale_major_tic_t, ref int li_y_scale_major_tic_t, ref string ls_points_of_t, ref string ls_points_color_t, ref string ls_points_type_t, ref int li_points_size_t, ref string ls_curve_of_t, ref string ls_curve_color_t, ref int li_curve_alpha_t, ref int li_curve_size_t, ref string ls_grid_of_t, ref string ls_grid_color_t, ref int li_grid_alpha_t, ref int li_grid_x_dash_t, ref int li_grid_y_dash_t, ref string ls_opt_of_t, ref string ls_opt_color_t, ref int li_opt_alpha_t, ref int li_opt_x_dash_t, ref int li_opt_y_dash_t, ref int li_return_default, ref int li_splash, ref double optmoisture, ref double maxdd, ref double pover, ref double osg, ref double om, ref double o_optmoisture, ref double o_maxdd, ref int oversized_flag, ref int debug_flag, ref string output) LIBRARY "ELMTREE_EXTERNAL.dll" ALIAS FOR "start_proctor;ansi" 

Function int start_grain_size(ref string dsn_name, ref string userid, ref string passwd, ref double test_data[], ref int td_length, ref double upper_bound[], ref int ub_length, ref double lower_bound[], ref int lb_length, ref string envelope, ref string specification, ref string pointmarker, ref string splinemarker, ref string display, ref string scale, ref string units, ref string xlabel, ref string direction, ref string maximum_density_line, ref int pan, ref string title, ref string save_location, ref string cwd, ref int show, ref double width, ref double height, ref string output) LIBRARY "ELMTREE_EXTERNAL.dll" ALIAS FOR "start_grain_size;ansi" 

在错误start_grain_size结果

Answer 1

我没有看到任何PB代码错误。我认为你的错误出现在调用Python的C代码中。您可能没有设置想要正确调用的函数的名称。这就是错误信息中的％s。我为python-c-api标记了这个问题，试图吸引一些大师。他们无疑会希望看到你的C代码调用Python。

Answer 2

我要尝试一个疯狂的猜测（信息还不够确定），并说PB应用程序在查找有问题的DLL时遇到了困难。您可以使用Process Monitor来确认这一点，以观看您的PB应用程序（确保您设置了过滤器，以便进程名称与您的应用程序匹配，否则您将获得大量信息，尽管您可以在事实之后进行过滤）并观察任何在失败情况下访问DLL失败。它可能是像当前目录正在更改，并且DLL的位置取决于搜索链中的链接。

如果是这种情况，我建议为您的应用程序创建一个App Path，它包含应用程序的路径，即使它只是包含EXE的文件夹。 IME，它已经解决了这些问题。

祝你好运，

特里。