我需要使用外部dll与数码相机进行通信,并且找到了可以启用通信的相应dll的程序。在dll描述中,我找到了适合我需求的函数。 DLL头看起来这....如何使用DELPHI中用C语言编写的外部DLL
//-------------------------------------------------------------------
// ReleaseShutter()
// Inputs:
// timeOutInSecs timeout in secs to wait for picture to be
// taken and downloaded (max 60 secs)
// pszFilename option string in which to store the name of the
// saved image. Set to NULL if not required
// numChars length of pszFilename if defined
//
// Returns:// 0 - Success, image saved
// 1 - PSRemote is not running
// 2 - PSRemote is running but camera is not connected
// 3 - Camera is busy
// 4 - Timeout waiting for image to be saved
// 5 - Error releasing shutter
//
// Description:
// Take a picture and optionally wait for it to be saved to disk.
//
//--------------------------------------------------------------------
PSRemoteLIB_API int __stdcall ReleaseShutter(int timeoutInSecs,
char* Filename,int numChars );
好吧,我加载DLL,使用功能,得到结果状态和外部程序需要的图片,但我不能获取文件名BACK !!!!这是我的代码
procedure TForm1.Button2Click(Sender: TObject);
var Status: Integer;
Name1: PChar;
DLLHandle: Thandle;
TakePic: Function (T: Integer; Nam: Pchar;Num:Integer):Integer; {$IFDEF WIN32} stdcall; {$ENDIF}
begin DLLHandle := LoadLibrary('PSRemoteLib.dll');
if DLLHandle >= 32 then { success }
begin
Name1:=stralloc(1024);
TakePic := GetProcAddress(DLLHandle, 'ReleaseShutter');
Status:=TakePic(60,Name1,SizeOf(Name1));
label1.Caption:=intTostr(Status);
label2.Caption:=Name1;
FreeLibrary(DLLHandle);
end
else MessageDlg('Error: could not find PSRemoteLib.dll', mtError, [mbOk], 0);
StrDispose(Name1);
end;
我尝试PChar PWidechar和我在网上发现的一切,但没有什么!
我做错了什么?在随DLL附带的示例.exe中运行CMD模式,这工作正常!程序需要图片和报告文件名????我有一个示例源代码,看起来像这样
case 0: // success if (filename && strlen(filename))
{
cout << "Success, image saved as: " << filename << endl;
}
else
{
cout << "Success, image saved on CF card?" << endl;
}
break;
case 1: cerr << "PSRemote is not running" << endl;
break;
case 2: cerr << "Camera is not connected" << endl;
break;
case 3: cerr << "Camera is busy" << endl;
break;
case 4: cerr << "Timeout waiting for image to be saved" << endl;
break;
default:
cerr << "ERROR: unexpected return status: " << status << endl;
}
}
return nRetCode;
}
请帮助我需要这个!
PS也DLL我也有类似的功能
{///----------------------------------------------------------------------- }
{/// GetOutputPath() }
{/// Inputs: }
{/// pszPathname string in which to store the pathname of the }
{/// directory currently being used to save images }
{/// numChars length of pszPathname }
{/// }
{/// Returns: }
{/// 0 - Success, pathname returned in pszPathname }
{/// 1 - PSRemote is not running }
{/// 4 - Some other error }
{/// }
{/// Description: }
{/// Returns the full pathname of the directory used for saving images. }
{/// This is the base directory as specified by SetOutputPath() plus }
{/// any separate directories for year, month or day if selected in }
{/// preferences. }
{/// }
{///----------------------------------------------------------------------- }
var
GetOutputPath: function(pszPathname: PChar;
numChars: var Integer): SREMOTELIB_API INT __STDCALL cdecl {$IFDEF WIN32} stdcall {$ENDIF};
,并再次获得状态(整数)回来,但不是路径名?????
欢迎来到StackOverflow。这是询问德尔福问题的好地方,但如果你(a)一次提出一个问题,(b)最好以其他人能够搜索并找到有用的方式提问。 – 2011-05-02 18:14:04
你使用的是什么版本的Delphi? – 2011-05-02 18:15:01