No replies to this topic

[esum26]

I need help on making this code use the COM windows interface. I am not sure where to start. Any help is greatly appreciated.

#include <stdio.h>
#include <conio.h>
#include <windows.h>
#include <string.h>

/* Definitions in the build of inpout32.dll are: */
/* short _stdcall Inp32(short PortAddress); */
/* void _stdcall Out32(short PortAddress, short data); */
/* prototype (function typedef) for DLL function Inp32: */
typedef short (_stdcall *inpfuncPtr)(short portaddr);
typedef void (_stdcall *oupfuncPtr)(short portaddr, short datum);
#define PPORT_BASE 0x378//port address for this computer (Auklet)

// Prototypes for Test functions
void test_read8(void);//reads input from the parallel port
void test_write(void);//writes a constant value to the parallel port(have to specify the constant value
//by editing the variable in the code
void test_write_datum(short datum);//writes the short value datum to the parallel port

/* After successful initialization, these 2 variables
will contain function pointers.
*/
inpfuncPtr inp32fp;
oupfuncPtr oup32fp;

/* Wrapper functions for the function pointers
- call these functions to perform I/O.
*/
//the two functions in the API of inpout32.dll
short Inp32 (short portaddr)
{
return (inp32fp)(portaddr);
}
void Out32 (short portaddr, short datum)
{
(oup32fp)(portaddr,datum);
}

int main(void)
{
HINSTANCE hLib;
short x;
int i;
DWORD dw;

/* Load the library */
hLib = LoadLibrary("inpout32.dll");
//hLib = LoadLibrary("C:\\Dev-Cpp");

dw = GetLastError(); //prints the error obtained by running the code
//based on windows system error code number
//printf("TestCode");
//printf("%S", dw);
//fprintf(stderr, "%S", static_cast <int> (dw));
//fprintf(stderr, "%i", dw);//prints the error in the code
//prints 0 in this case at first since 0 is the system error code for
//saying that there was no error
//http://msdn.microsoft.com/en-us/library/ms681382%28v=VS.85%29.aspx
if (hLib == NULL) {
fprintf(stderr,"LoadLibrary Failed.\n");//error obtained when running this code on borland
//and visual C++ compiler
//compiled but would not load the inpout32.dll file
//printf(dw);
//GetLastError();

return -1;
}
/* get the address of the function */
inp32fp = (inpfuncPtr) GetProcAddress(hLib, "Inp32");
if (inp32fp == NULL) {
fprintf(stderr,"GetProcAddress for Inp32 Failed.\n");
return -1;
}

oup32fp = (oupfuncPtr) GetProcAddress(hLib, "Out32");
if (oup32fp == NULL) {
fprintf(stderr,"GetProcAddress for Oup32 Failed.\n");
return -1;
}

/*******************************************************/
/** IF WE REACHED HERE, INITIALIZED SUCCESSFUL ******/
/*******************************************************/
/* now test the functions */

/***** Read 8 bytes at I/O base address */
//test_read8();

/***** Write 0x75 to data register and verify */
//test_write();

/***** One more time, different value */
//test_write_datum(0xAA);

test_write_datum(0x00);
/* finished - unload library and exit */
FreeLibrary(hLib);
return 0;
}
/*
TEST: Read inputs of 8 registers from PORT_BASE address
*/
void test_read8(void) {
short x;
int i;
/* Try to read 0x378..0x37F, LPT1: */
for (i=PPORT_BASE; (i < PPORT_BASE+8); i++) {
x = Inp32(i);
printf("Port read (%04X)= %04X\n",i,x);
}
}
/*
TEST: Write constant 0x77 to PORT_BASE (Data register)
*/
void test_write(void) {
short x;
int i;
/***** Write the data register */
i=PPORT_BASE;
x=0x75;
/***** Write the data register */
Out32(i,x);
printf("Port write to 0x%X, datum=0x%2X\n" ,i ,x);
/***** And read back to verify */
x = Inp32(i);
printf("Port read (%04X)= %04X\n",i,x);

/***** Set all bits high */
x=0xFF;
Out32(i,x);
/***** Now, set bi-directional and read again */
Out32(PPORT_BASE+2,0x20); // Activate bi-directional
x = Inp32(i);
printf("Set Input, read (%04X)= %04X\n",i,x);
Out32(PPORT_BASE+2,0x00); // Set Output-only again
x = Inp32(i);
printf("Reset Ouput, read (%04X)= %04X\n",i,x);

}
/*
TEST: Write data from parameter
*/
void test_write_datum(short datum) {
short x;
int i;
i=PPORT_BASE;
x = datum;
/***** Write the data register */
Out32(i,x);
printf("Port write to 0x%X, datum=0x%2X\n" ,i ,x);
/***** And read back to verify */
x = Inp32(i);
printf("Port read (%04X)= %04X\n",i,x);
}