关于delphi调用C写的动态链接库的函数参数类型的问题

[qiuqiu505]

现在有一项目需要调用C写的dll
C的原型函数是：
int __stdcall A20_SLE4442VerifyPWD(HANDLE ComHandle, BYTE _PWData[3]);
在delphi里面BYTE _PWData[3]应该是传什么类型的参数？

[sololie]

就是个数组， array[0.2] of byte

[sololie]

function A20_SLE4442VerifyPWD(ComHandle: DWORD;
  var _PWData: array of Byte): Integer; stdcall; external 'xxx.dll';

// 调用
var
  res: Integer;
  pwdata: array[0..2] of Byte;
begin
  res := A20_SLE4442VerifyPWD(com句柄, pwdata);
end;

[qiuqiu505]

引用 2 楼 sololie 的回复:

function A20_SLE4442VerifyPWD(ComHandle: DWORD;
  var _PWData: array of Byte): Integer; stdcall; external 'xxx.dll';

// 调用
var
  res: Integer;
  pwdata: array[0..2] of Byte;
begin
  res := A20_SLE4442VerifyPWD(com句柄, pwdata);
end;

这样调用报内存错

[sololie]

改改试试

function A20_SLE4442VerifyPWD(ComHandle: DWORD; _PWData: PByte): Integer;
stdcall; external 'xxx.dll';

// 调用
var
  res: Integer;
  pwdate: PByte;
begin
  GetMem(pwdate, SizeOf(Byte) * 3);
  ZeroMemory(pwdate, 0);
  res := A20_SLE4442VerifyPWD(com句柄, pwdate);
  FreeMem(pwdate);
end;