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How to create a DWORD using C++?

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How to create a DWORD using C++? C/C++ Help forum discussing building and maintaining applications in C/C++. Find out why these languages are the foundation on which other languages are built.

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  #1  
Old September 11th, 2006, 06:24 AM
Cyberfreak Cyberfreak is offline
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Question How to create a DWORD using C++?
I've tried many different ways to write a program that ones opened, it will create a DWORD file in a registry folder and set the DWORD's value to 1- but I seem to be missing something because the complier won't let me compile it.

Can someone please write an example of a program like that so that I can see what I missed in some of the programs that I tried to write.
Thanks.
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Old September 11th, 2006, 06:42 AM
costas costas is offline
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Sorry, I can't help; I have no idea.

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Old September 11th, 2006, 07:04 AM
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afaik, the best way is still to create a .reg file, and call regedit with that file using the system() call from C.

Search google to see how modifying the registry by means of .reg files works.
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Old September 11th, 2006, 09:50 AM
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Quote:
Originally Posted by Itsacon
afaik, the best way is still to create a .reg file, and call regedit with that file using the system() call from C.

Search google to see how modifying the registry by means of .reg files works.


Why didn't I think of that. Thats a great idea, thanks.
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Old September 11th, 2006, 10:26 AM
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You're welcome. Good luck :-)
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Old September 11th, 2006, 06:53 PM
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C Code:
Original - C Code 
  1.  
  2. #include <windows.h>
  3.  
  4. int main()
  5. {
  6.     HKEY hHKCU = NULL, hMyKey = NULL;
  7.     DWORD value = 1;
  8.     if (RegOpenKeyEx(HKEY_CURRENT_USER, NULL, 0, KEY_WRITE, &hHKCU) == ERROR_SUCCESS)
  9.     {
  10.         if (RegCreateKeyEx(hHKCU, "My_Subkey\\MyKey", 0, NULL, 0, KEY_WRITE, NULL, &hMyKey, NULL) == ERROR_SUCCESS)
  11.         {
  12.             RegSetValueEx(hMyKey, "ThisIsADword", 0, REG_DWORD, (BYTE*)&value, sizeof(DWORD));
  13.             RegCloseKey(hMyKey);
  14.         }
  15.  
  16.     }
  17.  
  18.     return 0;
  19. }

Creates a key under HKCU\My_Subkey\MyKey\ThisIsADword with type REG_DWORD and value 1. I'm on WinXP SP2 using Dev-C++.
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Old September 12th, 2006, 08:05 AM
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Quote:
Originally Posted by ubergeek
C Code:
Original - C Code 
  1.  
  2. #include <windows.h>
  3.  
  4. int main()
  5. {
  6.     HKEY hHKCU = NULL, hMyKey = NULL;
  7.     DWORD value = 1;
  8.     if (RegOpenKeyEx(HKEY_CURRENT_USER, NULL, 0, KEY_WRITE, &hHKCU) == ERROR_SUCCESS)
  9.     {
  10.         if (RegCreateKeyEx(hHKCU, "My_Subkey\\MyKey", 0, NULL, 0, KEY_WRITE, NULL, &hMyKey, NULL) == ERROR_SUCCESS)
  11.         {
  12.             RegSetValueEx(hMyKey, "ThisIsADword", 0, REG_DWORD, (BYTE*)&value, sizeof(DWORD));
  13.             RegCloseKey(hMyKey);
  14.         }
  15.  
  16.     }
  17.  
  18.     return 0;
  19. }

Creates a key under HKCU\My_Subkey\MyKey\ThisIsADword with type REG_DWORD and value 1. I'm on WinXP SP2 using Dev-C++.


Thanks.
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Old September 14th, 2006, 08:34 AM
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One more question.
If I wanted to write a program that creates a REG_SZ file, so I would write REG_SZ = This is a reg file (for example) instead of DWORD value = 1 and change REG_DWORD to REG_SZ and the sizeof(DWORD) to sizeof(REG_SZ)?
Thanks.
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Old September 14th, 2006, 06:17 PM
ubergeek ubergeek is offline
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I haven't tried it, but to change to REG_SZ I would first try these steps:
-change DWORD value = 1; to probably LPCSTR value = "This is a registry key.";
-change REG_DWORD to REG_SZ in the RegSetValueEx function call
-the last parameter to RegSetValueEx is the length of the data, so change it to the actual length of the string, i.e. strlen(value) (or count the chars in value beforehand and add 1 for the null terminator)
-change the (BYTE*)&value to just (BYTE*)value since an LPCSTR is already a pointer (to some form of char)
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