Linker problem with PSDK

Linker problem with PSDK

• Ujjwal Shrestha

  Can you please post the error you are seeing with a small stand alone sample reproducing the issue
  
  Thanks,
    Ayman Shoukry
    VC++ Team
  
  

• gmpdx

  Hi Again,
  
  I managed to fix the problem by adding user32.lib in the additional dependancies.
  I now just need to understand the LPCTSTR problem I have.
  
  I wish to use a variable as a placeholder of the window name and pass it to FindWindow like this:
  
  

  if (hwnd_app = FindWindow(NULL, LPCTSTR(m_strAppName)))
  
  So far I have managed to assign a value to m_str_AppName at the initialisation like this:
  

  char m_strAppName[255] = "Application";
  
  but if I try to reassign it in the code like this:
  
  m_str AppName = "Something_Else";
  
  I get a conversion errer of the compiler.
  
  As I stated earlier, I am new to programming, and what I do program I do seldomly. How can I handle this neatly please
  
  Thanks.

  
  
  

• Matt Hollingsworth

  I assume you have Visual C++ Express...
  
  You probably missed a step when you installed the PSDK, and thus the Platform SDK wasn't installed properly. The complete install process is located in http://msdn.microsoft.com/vstudio/express/visualc/usingpsdk/default.aspx (If you forget to perform step 4, you'll get linker errors such as the one you mentioned).
  
  instead of doing:
  
  char m_strApplicationName[255]="Application";
  m_strApplicationName = "Something Else";
  if(hwnd_app = FindWindow(NULL, LPCTSTR(m_strApplicationName)))
  
  try:
  
  std::string m_strApplicationName="Application";
  m_strApplicationName = "Something Else";
  if(hwnd_app = FindWindow(NULL, m_strApplicationName.c_str()))
  
  (also make sure you #include<string> at the top of your file).
  
  
  

• Daniel F.

  Just in case you are wondering why you need to do all these weird things for strings, there is no native handling of a string type in C/C++. There are utility functions written for it, and also as was pointed out, the string class in the stl.
  What method you use to handle strings is up to you, but learning how to handle them is a good idea.
  Another problem which you seemed to have mentioned is the use of tchar functions and types. The important thing to remember about these is they are not types on their own, they are aliases for other types depending on if you have Unicode set or not. With Unicode set LPTSTR = LPWSTR = wchar_t*. When Unicode is not set, LPTSTR = LPSTR = char*.
  Some things which you may find helpful to look at.
  
  CRT string routines.
  http://msdn.microsoft.com/library/en-us/vclib/html/_crt_string_manipulation.asp
  
  CRT overview.
  http://msdn.microsoft.com/library/en-us/vclib/html/vcrefRunTimeLibraryReference.asp
  
  STL string.
  http://msdn.microsoft.com/library/en-us/vcstdlib/html/vclrf_string_header.asp
  
  STL overview.
  http://msdn.microsoft.com/library/en-us/vcstdlib/html/vcoriStandardCLibraryReference.asp

  
  
  

• Emile Bosch

  This is a C# forum. Perhaps you should consider posting to the C++ forum instead.
  
  You can use the CRT strncpy function or the Windows API lstrcpyn to change the value of m_strAppName.
  
  
  
  
• Linker problem with PSDK