Hi All

I have been sent a third party DLL to use in conjunction with some Postcoding software and as usual the documentation comes with calling examples for VB & C++ only. I have attempted to implement a call directly from VFP7 but the code keeps crashing out of VFP7 without returning any kind of error report.
Is there anyway I can determine the number and sizeof the parameters to pass to this DLL.

Many thanks
Paul

Here is the C++ code:
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#include
#include

void msgstr(DWORD code, char *buf, int buf_l)
{
int x,y;
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,NULL,code,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
buf,buf_l,NULL);
x=y=0;
while (buf[x]) {
if (!iscntrl(buf[x])) buf[y++] = buf[x];
x++;
}
buf[y] = '\0';
}

int main(int argc, char *argv[])
{
HINSTANCE lib;
char iobuf[1024];
struct verify_s {
short count;
char more[1];
char table[250][90];
};
typedef void (__stdcall * rapidCallPtr_t)(char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[40], char (*)[5][30], struct verify_s *);
rapidCallPtr_t rapidA;
int i,l;
struct calldata_s {
char status[40];
char premise[40];
char postcode[40];
char addr1[40];
char addr2[40];
char addr3[40];
char addr4[40];
char addr5[40];
char addr6[40];
char addr7[40];
char addr8[40];
char addr9[40];
char barcode[40];
char matchkey[40];
char name32[40];
char dps[40];
char error[40];
char ref[5][30];
struct verify_s verify;
};

struct calldata_s cdata;

if (!(lib=LoadLibrary("C:\\PAF5\\LMaddman\\cob4001.dll"))) {
strcpy(iobuf,"Cannot open cob4001.dll; ");
l=strlen(iobuf);
msgstr(GetLastError(),iobuf+l,sizeof iobuf - l);
puts(iobuf);
}
else if (!(rapidA = (rapidCallPtr_t)GetProcAddress(lib,"RAPID"))) {
strcpy(iobuf,"Unable to resolve library reference rapid; ");
l=strlen(iobuf);
msgstr(GetLastError(),iobuf+l,sizeof iobuf - l);
puts(iobuf);
}

printf("%08X\n",rapidA);
memset(&cdata,' ',sizeof cdata);
cdata.verify.count = 0;

cdata.status[0] = 'R';

while (cdata.status[0] == 'R') {
strncpy(cdata.postcode,"BA1 5HH",7);
cdata.premise[0] = '5';
(rapidA)(&cdata.status, &cdata.postcode, &cdata.premise, &cdata.name32,
&cdata.addr1, &cdata.addr2, &cdata.addr3, &cdata.addr4, &cdata.addr5, &cdata.addr6,
&cdata.addr7, &cdata.addr8, &cdata.addr9, &cdata.barcode, &cdata.matchkey, &cdata.dps,
&cdata.error, &cdata.ref, &cdata.verify);
}
printf("%.*s\n",40,cdata.name32);

for (i=0;i<5;i++) printf("%.30s\n",cdata.ref[i]);
return 0;
}
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