C/C++调用delphi编写的dll文件

library xrBitOperation;
{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }
  System.SysUtils,
  System.Classes;
function xrbittest(B:Byte;N:Byte):Boolean;stdcall;
begin
  result := ((B shr N) and $01) = $01;
function xrBitset(B:Byte;N:Byte): Byte;stdcall;
begin
  result := B or (1 shl N);
function xrBitClear(B:Byte;N:Byte):Byte;stdcall;
begin
  result := B and (not(1 shl N));
{$R *.res}
//注意Exports的位置
exports
  xrbittest index 1 name 'xrbittest',
  xrbitset index 2 name 'xrbitset',
  xrbitclear index 3 name 'xrbitclear';
//如果用下面的格式，在dll文件的编译时不会出错，但是在使用时会出错
//xrbittest,xrbitset,xrbitclear;
begin
end.

#include "stdio.h"
#include "stdlib.h"
#include "windows.h"
typedef  unsigned char (_stdcall *xrbittest)(unsigned char, unsigned char);
int main(void)
	unsigned char B;
	unsigned char B0,B1;
	HMODULE h = LoadLibraryA("xrBitOPeration.dll");
	if (h == NULL)
		printf("xrBitOPeration.dll NOT found!.\n");
		printf("Load Library Success!.\n");
	xrbittest proc = (xrbittest)GetProcAddress(h, "xrbittest");
	if (proc == NULL)
		printf("function:xrbittest Not found.\n");
		printf("function:xrbittest Found.\n");
	B = 1;
	B0 = proc(B, 0);
	printf("B0 = %d.", B0);
	B1 = proc(B, 1);