Design time license for leadtools 17

Currently I'm using VS 2010, leadtools 17 and c++ for development.
When I'm trying to add a new leadtools object in VS, a error occurred as "need design time license".
I have seen your solution for this problem and tried to uninstall and re-install leadtools 17 by register leadtools 17 file(.ocx). But it does not work.
Can you give a more detail solution towards this problem.
Thanks.

Leon,
This could be a problem of missing lic file. Do you have the ltocx.lic in the same folder that have ltocx.ocx? If not, please put the lic file next to the ltocx.ocx file.

It works and thanks so much as I has been headache with this problems for weeks.

One more question:
Same environment: VS 2010, leadtools 17 and c++.
As I convert my project from VC6.0 to VS 2010, these errors occur after compile.


1>Convert.obj : error LNK2001: unresolved external symbol "public: virtual struct CRuntimeClass * __thiscall CLEAD::GetRuntimeClass(void)const " (?GetRuntimeClass@CLEAD@@UBEPAUCRuntimeClass@@XZ)
1>Convert.obj : error LNK2019: unresolved external symbol "public: short __thiscall CLEAD::GetFileInfo(wchar_t const *,long,long)" (?GetFileInfo@CLEAD@@QAEFPB_WJJ@Z) referenced in function __catch$?LoadSourceImage@CConvertDlg@@QAEHPA_W@Z$0
1>Convert.obj : error LNK2019: unresolved external symbol "public: short __thiscall CLEAD::Load(wchar_t const *,short,long,long)" (?Load@CLEAD@@QAEFPB_WFJJ@Z) referenced in function "public: int __thiscall CConvertDlg::LoadSourceImage(wchar_t *)" (?LoadSourceImage@CConvertDlg@@QAEHPA_W@Z)
1>Convert.obj : error LNK2019: unresolved external symbol "public: short __thiscall CLEAD::Save(wchar_t const *,short,short,short,short)" (?Save@CLEAD@@QAEFPB_WFFFF@Z) referenced in function __catch$?ConvertImage@CConvertDlg@@QAEHPA_WHHPAUPhotoInfo@@H@Z$0
1>Convert.obj : error LNK2019: unresolved external symbol "public: short __thiscall CLEAD::Size(float,float,short)" (?Size@CLEAD@@QAEFMMF@Z) referenced in function "public: int __thiscall CConvertDlg::ConvertImage(wchar_t *,int,int,struct PhotoInfo *,int)" (?ConvertImage@CConvertDlg@@QAEHPA_WHHPAUPhotoInfo@@H@Z)
1>Convert.obj : error LNK2019: unresolved external symbol "public: short __thiscall CLEAD::GetInfoFormat(void)" (?GetInfoFormat@CLEAD@@QAEFXZ) referenced in function "public: int __thiscall CConvertDlg::ConvertImage(wchar_t *,int,int,struct PhotoInfo *,int)" (?ConvertImage@CConvertDlg@@QAEHPA_WHHPAUPhotoInfo@@H@Z)
1>Convert.obj : error LNK2019: unresolved external symbol "public: short __thiscall CLEAD::GetInfoBits(void)" (?GetInfoBits@CLEAD@@QAEFXZ) referenced in function "public: int __thiscall CConvertDlg::ConvertImage(wchar_t *,int,int,struct PhotoInfo *,int)" (?ConvertImage@CConvertDlg@@QAEHPA_WHHPAUPhotoInfo@@H@Z)
1>Convert.obj : error LNK2019: unresolved external symbol "public: float __thiscall CLEAD::GetInfoHeight(void)" (?GetInfoHeight@CLEAD@@QAEMXZ) referenced in function "public: int __thiscall CConvertDlg::ConvertImage(wchar_t *,int,int,struct PhotoInfo *,int)" (?ConvertImage@CConvertDlg@@QAEHPA_WHHPAUPhotoInfo@@H@Z)
1>Convert.obj : error LNK2019: unresolved external symbol "public: float __thiscall CLEAD::GetInfoWidth(void)" (?GetInfoWidth@CLEAD@@QAEMXZ) referenced in function "public: int __thiscall CConvertDlg::ConvertImage(wchar_t *,int,int,struct PhotoInfo *,int)" (?ConvertImage@CConvertDlg@@QAEHPA_WHHPAUPhotoInfo@@H@Z)
1>Convert.obj : error LNK2019: unresolved external symbol "public: short __thiscall CLEAD::LoadResize(wchar_t const *,float,float,short,short)" (?LoadResize@CLEAD@@QAEFPB_WMMFF@Z) referenced in function "public: int __thiscall CConvertDlg::ConvertImgFileByW_H(char *,char *,int,int,int)" (?ConvertImgFileByW_H@CConvertDlg@@QAEHPAD0HHH@Z)
1>Convert.obj : error LNK2019: unresolved external symbol "public: void __thiscall CLEAD::SetEnableMethodErrors(int)" (?SetEnableMethodErrors@CLEAD@@QAEXH@Z) referenced in function "protected: virtual int __thiscall CConvertDlg::OnInitDialog(void)" (?OnInitDialog@CConvertDlg@@MAEHXZ)
1>Convert.obj : error LNK2019: unresolved external symbol "public: void __thiscall CLEAD::SetScaleMode(short)" (?SetScaleMode@CLEAD@@QAEXF@Z) referenced in function "protected: virtual int __thiscall CConvertDlg::OnInitDialog(void)" (?OnInitDialog@CConvertDlg@@MAEHXZ)

Should I include some lib? A lead.h file is included right now and all the functions have been defined.

Hello,

Since you're converting your project from VC 6.0 to VC 10.0, there isn't any way to know if all of the information the VC 6.0 compiler added into the header and CPP files are even in use by VC 10.0? It might be that the newer compiler needs incldues that weren't created originally, and that's the problem here.

The best thing to do here is likely to try adding the OCX to an empty 2010 project. Try and get that to compile and run with no issues.

Once that is working, make a copy of your original VC 6.0 project. It wouldn't be good to mess around with your original project. If something goes wrong in the conversion with a copy, you can always delete it and start over. With the copy though, you can then try compiling in 2010, and begin replacing the header and CPP files as needed from the new empty 2010 project over the older VC 6.0 generated files.