#include "l_bitmap.h"

L_LTKRN_API L_INT L_SetLicenseFile (pszLicenseFile, pszDeveloperKey)

Sets the runtime license for LEADTOOLS and unlocks support for optional features such as LEADTOOLS Imaging Pro, Document and Medical Imaging capabilities, or PDF support.


L_TCHAR* pszLicenseFile

Character string containing the name of the LEADTOOLS runtime license file to load.

L_TCHAR* pszDeveloperKey

Character string containing the developer key.


Value Meaning
SUCCESS The runtime license was valid.
< 0 An error occurred. Refer to Return Codes.


You must use this function to set the runtime license for LEADTOOLS and to unlock support for any optional features that you have licensed.  If you do not set a runtime license, your application will display a "nag" message dialog at runtime, indicating that you have developed the application without a valid runtime license.

In order to obtain a runtime license and developer key, you must contact LEAD.  For more information, refer to About LEADTOOLS Runtime Licenses.

For information about LEADTOOLS Document/Medical capabilities, contact LEAD.

To determine whether support for optional features has been unlocked, use the L_IsSupportLocked function.

To set the runtime license from a memory buffer instead of a disk file, use the L_SetLicenseBuffer function.

Required DLLs and Libraries


Win32, x64, Linux.

See Also




Set the LEADTOOLS runtime license from a disk file.

#define MY_LICENSE_FILE L_TEXT("d:\\temp\\TestLic.lic") 
#define MY_DEVELOPER_KEY L_TEXT("xyz123abc") 
L_INT SetLicenseFileExample(L_VOID) 
   /* set the runtime license */ 
   /* check for unlocked support */ 
   if (L_IsSupportLocked(L_SUPPORT_MEDICAL)) 
      MessageBox(NULL, L_TEXT("Medical Locked\n"), L_TEXT(""), MB_OK); 
      MessageBox(NULL, L_TEXT("Medical Unlocked\n"), L_TEXT(""), MB_OK); 
   return nRet; 

Help Version 21.0.2021.4.7
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2021 LEAD Technologies, Inc. All Rights Reserved.

LEADTOOLS Raster Imaging C API Help