Delphi 调用VC的DLL
VC中DLL声名格式: Extern “C” void __declspec(dllexport) __stdcall ShowMess(HWND hwnd, char* mess);输出格式为:_ShowMess@8,“8”为函数参数字节数为了避免名称分裂,可采用以下方法解决:1.声明中不加__stdcall,采用VC默认格式__cdecl,但在Delphi中要注明调用格式为cdecl。2.在VC工程中添加def文件,如:LIBRARYEXPORTSShowMess @1则DLL中输出函数名称不分裂。
Delphi中调用格式: Procedure ShowMess (h:HWND; mess:PChar); Stdcall;{Cdecl;} external LibName;如无Stdcall或Cdecl声名,Delphi默认Register(FastCall)调用格式。
注意Delphi与VC的对齐格式不同,在VC中定义结构时要用以下格式: #pragma pack(4)//结构定义#pragma pack()
回调函数声明错了
Pparam_byname_data = ^Tparam_byname_data;
Tparam_byname_data = record
point_name : array[0..255] of Char ;
param_name : array[0..255] of Char ;
param_offset : LongInt ;
padding1 : LongInt ; //for byte alignment between VB and C
param_value : Variant;
param_type : word;
padding2 : Integer ; //for byte alignment between VB and C
status : LongInt ;
End; {param_byname_data} function rhsc_param_value_put_bynames(Server : PChar; num_requests : Integer;
numb_prm:Pparam_byname_data) : LongInt; cdecl;
external 'hscnetapi.dll';调用
var servername: array[0..255] of char;
params : arrray[0..10] of Tparam_byname_data; fillchar(servername,0,256);
fillchar(params,0,sizeof(Tparam_byname_data)*11);
rhsc_param_value_put_bynames(@servername[0],11,@params[0]);