BCB编写DLL文件遇到的问题
代码如下：

//---------------------------------------

#include <vcl.h>
#include <windows.h>
#pragma hdrstop
//---------------------------------------
//   Important note about DLL memory management when your DLL uses the
//   static version of the RunTime Library:
//
//   If your DLL exports any functions that pass String objects (or structs/
//   classes containing nested Strings) as parameter or function results,
//   you will need to add the library MEMMGR.LIB to both the DLL project and
//   any other projects that use the DLL.  You will also need to use MEMMGR.LIB
//   if any other projects which use the DLL will be performing new or delete
//   operations on any non-TObject-derived classes which are exported from the
//   DLL. Adding MEMMGR.LIB to your project will change the DLL and its calling
//   EXE's to use the BORLNDMM.DLL as their memory manager.  In these cases,
//   the file BORLNDMM.DLL should be deployed along with your DLL.
//
//   To avoid using BORLNDMM.DLL, pass string information using "char *" or
//   ShortString parameters.
//
//   If your DLL uses the dynamic version of the RTL, you do not need to
//   explicitly add MEMMGR.LIB as this will be done implicitly for you
//---------------------------------------

#pragma argsused
int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void* lpReserved)
{
        return 1;
}
//---------------------------------------
extern  "C"  __declspec(dllexport) AnsiString __stdcall  PassWord(AnsiString cz0003_6,int cz0003_a)
 {// 字符串加解密处理函数
    // 参数说明：cz0003_6 --- 待处理字符串
    // cz0003_a --- 处理方式(1.加密;-1.解密)
    AnsiString cz0003_0,cz0003_1,cz0003_2,cz0003_3,cz0003_4,cz0003_8;
    int cz0003_7,cz0003_5,cz0003_9;
    AnsiString s1,s2;
    int j=0;

    cz0003_0="#$%$%$^%#%$DF^RDTYDCJV<P)*_)(*^&%^$%EDCFFVC GHGR^&FV#!@#$$^%&^(*)_ZXCVBNM<>>?<>";
    cz0003_1="1203.645987987ZXNFDADUQRETYPU]IO[]I'\K;G'HJLG'./,NXJKBqwepwqort][po=-=009886723465";
    cz0003_2="186548641618bfsiudfhsdZQWSQYHEWDIOUFPQPOWERUWEIOFHONFDLK;DSBVZVBSBDGFVSDLGIOSDHG";
    //cz0003_3="版本 Ver 1.0";
    cz0003_4=cz0003_0 + cz0003_1 + cz0003_2; // 加密字符串
    cz0003_5=cz0003_4.Length(); // 加密字符串长度 
 
    cz0003_8=""; // 加密后的字符串
    cz0003_9=0;
    if(cz0003_a==-1)
     {
       for(cz0003_7=1;cz0003_7<=cz0003_6.Length();cz0003_7++)
        {
           //s1:=copy(cz0003_6,cz0003_7,1);
           s1 = cz0003_6.SubString(cz0003_7,1);
           //s2:=copy(cz0003_4,(cz0003_7-1) mod cz0003_5+1,1);
           if(cz0003_7/2==0)
           {
              s2 = cz0003_4.SubString((cz0003_7-1) % cz0003_5+2,1);
           }
           else if(cz0003_7/3==0)
           {
              s2 = cz0003_4.SubString((cz0003_7-1) % cz0003_5+3,1);
           }
           else
           {
              s2 = cz0003_4.SubString((cz0003_7-1) % cz0003_5+1,1);
           }
           cz0003_9=int(s1[1])-int(s2[1]);
           if(cz0003_9<0)
           cz0003_8=cz0003_8+String(char(cz0003_9+256));
           else
           cz0003_8=cz0003_8+String(char(cz0003_9));
        }
        
    }
    else
    {
       // 加密运算
       for(cz0003_7=1;cz0003_7<=cz0003_6.Length();cz0003_7++)
       {
         s1=cz0003_6.SubString(cz0003_7,1);
         if(cz0003_7/2==0)
         {
            s2=cz0003_4.SubString((cz0003_7-1) % cz0003_5+2,1);
         }
         else if(cz0003_7/3==0)
         {
            s2=cz0003_4.SubString((cz0003_7-1) % cz0003_5+3,1);
         }
         else
         {
            s2=cz0003_4.SubString((cz0003_7-1) % cz0003_5+1,1);
         }
         cz0003_9=int(s1[1])+int(s2[1]);
         if(cz0003_9>255) 
 
         cz0003_8=cz0003_8+String(char(cz0003_9-256));
         else
         cz0003_8=cz0003_8+String(char(cz0003_9));
         //j++;
      }

   }
   cz0003_6=cz0003_8;
   return cz0003_8;
}  

按F9 Run 的时候提示错误：Cannot debug project unless a host application is defined. Use the Run|Parameters... dialog box.
本人初学DLL文件的编写求各位大侠指教。
[解决办法]
DLL调试时需要一个调用的应用程序。选择Run
[解决办法]
Parameters，在Browse里面选择导入你的调试程序EXE图标即可
[解决办法]

引用:

DLL调试时需要一个调用的应用程序。选择Run
[解决办法]
Parameters，在Browse里面选择导入你的调试程序EXE图标即可

正确

要调用自己编写的dll，直接在你调试程序中加入dll。h文件和lib文件，dll的函数就可以直接调用了