Comments by Member 9063138 (Top 2 by date)

HI....
I TRY THE FOLLOWING CODE!!!!:


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


// Prototypes for Test functions
void test_read8(void);
void test_write(void);
void test_write_datum(short datum);


/* 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.
*/
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;


/* Load the library */
hLib = LoadLibrary("inpout32.dll");

if (hLib == NULL) {
fprintf(stderr,"LoadLibrary Failed.\n");
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);


/* 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);
}

BUT ERREOR HAPPEND:
error C2664: 'LoadLibraryW' : cannot convert parameter 1 from 'const char [13]' to 'LPCWSTR'
WHY????????????