带out的用法
gum 2000-07-28 01:53:00 $$$.lib 声明文件:$$$.h
$$$.h
#ifndef FT_DEFINED
#define FT_DEFINED
#ifndef FT_DLL_INTERFACE
#ifdef __cplusplus
#define FT_DLL_INTERFACE extern "C" __declspec(dllimport)
#else
#define FT_DLL_INTERFACE __declspec(dllimport)
#endif
...
FT_DLL_INTERFACE
void FT_getVersion(
OUT FT_VERSION_PT versionPt); /* software version */
...
typedef struct
{
unsigned major;
unsigned minor;
unsigned build;
}
FT_VERSION, *FT_VERSION_PT;
以上为结构等的声明。
************************************************************
void __fastcall TForm1::Button2Click(TObject *Sender)
{
1) HINSTANCE hdl;
2) FT_VERSION_PT versionPt;
3) typedef int _stdcall(*GetVersion)(FT_VERSION_PT);
4) GetVersion lpGetVersion;
5) int ddd;
6) hdl = LoadLibrary("$$$.dll");7
7) if(!hdl)
Form1->Close();
8) lpGetVersion =(GetVersion)GetProcAddress(hdl,"FT_getVersion");
9) if(lpGetVersion!=(FARPROC)NULL)
10) ddd=lpGetVersion(versionPt);
11) FreeLibrary(hdl);
}
第8行 lpGetVersion 可得到函数的指针
第10行 报告versionPt :"read of address "fffffffff""