lvalue error trying to copy between structures

I am trying to copy data between two structures, i.e. from record read in to record to be written out.
This is in Microsoft C (ver6).

I have them declared like this

Code:

struct GLD0DATA
   {
   char GlSt	;       /* 0    */
   char	Filler1 [20];	/* 1    */
   char GlAcCC  [2];    /* 21   */
   char GlAcCX  [1];    /* 23   */
<snip>
   char GlMatDt [6];    /* 442  */
   char GlFill5 [1416]; /* 448  */
   char GlDrac  [7];    /* 1864 */
   char GlCrac	[7];    /* 1871 */
   char GlFill6 [170];  /* 1878  fill out till end  */
   };                   /* 2048 */

struct ICRSEX1A
   {
   char ICAcCC  [2];  
   char ICAcCX  [1];  
   char ICAcMM  [2]; 
   char ICAcno  [6];
   char ICAcSS  [2];	
   char ICCrInt [9];    
   char ICDrInt [9];    
   char ICMatDt [6];    
   };      

char WKAcCC  [2];  
char WKAcCX  [1];  
char WKAcMM  [2]; 
char WKAcno  [6];
char WKAcSS  [2];	
char WKCrInt [9];    
char WKDrInt [9];    
char WKMatDt [6];    

int             IN_BUF_LEN;
int             OUT_BUF_LEN;
struct GLD0DATA REC_BUF,  *pi;             /*  initially I did not use pointers   */
struct ICRSEX1A OUT_BUF,  *po;             /*  with pointers still get same error */   
char            IN_POS_BLK[128];
char            OUT_POS_BLK[128];
char            IN_KEY_BUF[2];
char            OUT_KEY_BUF[2];
char            FIL_NAME[60]= "";
char            OUT_NAME[60]="";

main ()
{
   pi = &REC_BUF;
   po = &OUT_BUF;

First I tried directly from structure to structure, then put in intermediary work variables
(as shown)

Code:

	    if (strncmp(str1,"     ",5) != 0)
	    {
		WKAcCC  =  pi->GlAcCC;
		WKAcCX  =  pi->GlAcCX;
		WKAcMM  =  pi->GlAcMM;
		WKAcno  =  pi->GlAcno;
		WKAcSS  =  pi->GlAcSS;
		WKCrInt =  pi->GlCrInt;
		WKDrInt =  pi->GlDrInt;
		WKMatDt =  pi->GlMatDt;


		po->ICAcCC  =  WKAcCC;
		po->ICAcCX  =  WKAcCX;
		po->ICAcMM  =  WKAcMM;
		po->ICAcno  =  WKAcno;
		po->ICAcSS  =  WKAcSS;
		po->ICCrInt =  WKCrInt;
		po->ICDrInt =  WKDrInt;
		po->ICMatDt =  WKMatDt;

but still get same error when compiling
"error C2106: '=' : left operand must be lvalue"

Any help appreciated!

Thanks,
Bob

Char arrays need to be copied with
- strcpy - if it's a short printable string with a \0
- strncpy - it it's a longer printable string, possibly without a \0
- memcpy - if it's arbitrary binary data

Thanks for the v.quick reply! I'll try it out.

Wish I was a God and not a hacker...