在Sketchup中调用dll库时出现的Ruby Sketchup错误

Question

我希望Sketchup可以导入多个文件。但是不幸的是，Sketchup并不支持它。所以我创建了一个dll库。它调用Window API函数:用于显示多选择对话框的GetOpenFileName，获取选定的文件名并以格式化的字符串显示它们(所选的目录\ filename1 \filename2 2.)。然后我把它和Win32API.so放在Sketchup的插件文件夹中。但是当我打开Sketchup时，它会显示错误：

错误加载文件GetProcAddress: ShowDialog或ShowDialogA (ShowDialog是dll的一个函数)

​

这是我的dllmain.cpp代码(C++代码)

#define EXPORT _declspec(dllexport)
HWND hDlg = NULL;
wchar_t* buffer = new wchar_t[32768];

EXPORT void ShowDialog(void)
{
    OPENFILENAME ofn;
    wchar_t szFile[32768];
    // Initialize OPENFILENAME
    ofn.lStructSize = sizeof(ofn);
    ofn.hwndOwner = hDlg;
    ofn.lpstrFile = (wchar_t*)szFile;
    ofn.lpstrFile[0] = '\0';
    ofn.nMaxFile = sizeof(szFile);
    ofn.lpstrFileTitle = NULL;
    ofn.nMaxFileTitle = 0;
    ofn.lpstrInitialDir = NULL;
    ofn.Flags =  OFN_ALLOWMULTISELECT | OFN_ENABLESIZING | OFN_EXPLORER;
    if(GetOpenFileName(&ofn) == TRUE)
    {
        if(szFile[ofn.nFileOffset-1] != '\0')
        {
            wcscpy_s(buffer,sizeof(szFile),szFile);
        }
        else
        {
            //Multi-select
            wchar_t* p= szFile;
            int i =0;
            while(*p)
            {
                wchar_t* temp = new wchar_t[1024];
                //Copy p into temp
                wcscpy_s(temp,1024,p);
            if(i==0)
            {
                wcscpy_s(buffer,1024,temp);
            }
            else
            {
                wcscat_s(buffer,1024,temp);
            }
            wcscat_s(buffer, sizeof(buffer) * wcslen(buffer), L"|");
            i++;
            p += lstrlen(p) + 1;
        }
    }
    int len = wcslen(buffer);
    buffer[len]='\0';
}



EXPORT void GetResult(char* pString)
{
    int len = wcslen(buffer);
    for(int i =0 ; i < wcslen(buffer);i++)
    {
        pString[i] = (char)buffer[i];
    }
    pString[len]='\0';
}

这是我的红宝石文件中的脚本。

require 'sketchup.rb'
require "Win32API"
path = Sketchup.find_support_file("\Plugins\\")
#my dll has name MultiUploadProject.dll
mydll = path + "\\MultiUploadProject.dll"
if (!FileTest.exist?( mydll ) )
    UI.messagebox(sprintf("MultiUploadProject.dll not found in SketchUp plugins folder: %s\n",mydll))
end
ShowDialog = Win32API.new(mydll,"ShowDialog",["V"],"V")
GetResult = Win32API.new(mydll,"GetResult",["P"],"V")
def load_dialog
    ShowDialog.call
    string = " " * 32768
    GetResult.call(string)
end

我使用Visual 2012构建dll，我的Sketchup是Sketchup 8

如有任何建议，将不胜感激。

Answer 1

导出需要是C导出(没有C++名称损坏)。尝试像这样定义导出宏：

#define EXPORT extern "C" _declspec(dllexport)

或在extern "C“中定义导出的函数

extern "C" {

// Exported functions here.

}