How write to the registry TRegistry -> WriteBinaryData hexadecimal data.-CodePudding

Want to modify the registry by the program, controlling the printer printing set,
First remove the current set point, change again after back,

TRegistry * Reg;
Reg=new TRegistry (KEY_ALL_ACCESS);

Reg - & gt; RootKey=HKEY_CURRENT_USER;
Reg - & gt; OpenKey (" Printers \ \ DevModePerUser ", true);

Reg - & gt; Wateress GetDataType (" ");
Int BuffLength=Reg - & gt; Wateress GetDataSize (" ");
Unsigned char * Buff=new unsigned char [BuffLength + 1];
Reg - & gt; ReadBinaryData (" wateress ", Buff, BuffLength);

AnsiString strHex;
for(int i=0; IStrHex=strHex + "" + IntToHex (((int) Buff [I]), 2);

}
//left left left modify Settings left left left
StrHex=...
//write write write modified value write write write

Then I want to have the above revised strHex in back in the same type, how to do it, please?
Reg - & gt; WriteBinaryData (" wateress strHex BuffLength);
Please help me check it out!

CodePudding user response:

Top,
Dry c + + for the first time encountered such a problem!

CodePudding user response:

Consult example
http://docwiki.embarcadero.com/CodeExamples/Seattle/en/JumpListTest_%28C%2B%2B%29

CodePudding user response:

 Reg - & gt; WriteBinaryData (" wateress, "strHex c_str (), BuffLength);

CodePudding user response:

 Reg - & gt; WriteBinaryData (" wateress, "strHex c_str (), strHex. The Length ());

CodePudding user response:

The

reference 3 floor ksrsoft response:

 Reg - & gt; WriteBinaryData (" wateress, "strHex c_str (), BuffLength);

Thank you for your reply,

That's what I write do you,
The results don't know why, registry keys have been deleted,

Then I just what all don't change, after out directly strHex. C_str (), home is the same effect (registry keys are deleted),

For some reason,

CodePudding user response:

Are not met?
For dry c + +, for the first time I met MAO how intractable problems,

CodePudding user response:

Test not I delete, add at the end of the
Reg - & gt; CloseKey ();
The delete Reg.
In addition your data to read, write is have change

 void __fastcall TForm3: : Button2Click (TObject * Sender) 
{
TRegistry * Reg; 
Reg=new TRegistry (KEY_ALL_ACCESS); 

Reg - & gt; RootKey=HKEY_CURRENT_USER; 
Reg - & gt; OpenKey (" Printers \ \ DevModePerUser ", true); 

Reg - & gt; Wateress GetDataType (" "); 
Int BuffLength=Reg - & gt; Wateress GetDataSize (" "); 
Byte Buff [20]. 
Reg - & gt; ReadBinaryData (" wateress ", Buff, sizeof (Buff)); 

AnsiString strHex; 
for (int i=0; I & lt; BuffLength; I++) {
StrHex=strHex + "" + IntToHex (((int) Buff [I]), 2); 
} 
//left left left modify Settings left left left 
If (strHex. Length ()==0) 
{
Buff [0]=0 x01; 
Reg - & gt; WriteBinaryData (" wateress ", Buff, 1); 
} 
The else 
{
Reg - & gt; WriteBinaryData (" wateress, "strHex c_str (), strHex. The Length ()); 
} 

Reg - & gt; CloseKey (); 
The delete Reg. 
}

CodePudding user response:

Thank you for your reply,
I am also the new test again,
The reason can make me out and I deposited in the different,
Like me, take out the
{" 01 "}

Through the following processing, deposit not again {" 01 "},
Become
{" 20 to 30 31},

Could you tell me the blame to solve?

TRegistry * Reg;
Reg=new TRegistry (KEY_ALL_ACCESS);

Reg - & gt; RootKey=HKEY_CURRENT_USER;
Reg - & gt; OpenKey (" Printers \ \ DevModePerUser ", true);

Reg - & gt; Wateress GetDataType (" ");
Int BuffLength=Reg - & gt; Wateress GetDataSize (" ");
//unsigned char * Buff=new unsigned char [BuffLength + 1];
Unsigned char * Buff=new unsigned char [BuffLength];
Reg - & gt; ReadBinaryData (" wateress ", Buff, BuffLength);

AnsiString strHex;
for(int i=0; IStrHex=strHex + "" + IntToHex (((int) Buff [I]), 2);
}

If (strHex. Length ()==0) {
Buff [0]=0 x01;
Reg - & gt; WriteBinaryData (" wateress ", Buff, 1);
} else {
Reg - & gt; WriteBinaryData (" wateress, "strHex c_str (), strHex. The Length ());
}

Reg - & gt; CloseKey ();
The delete Reg.

CodePudding user response:

 void __fastcall TForm3: : Button2Click (TObject * Sender) 
{
TRegistry * Reg; 
Reg=new TRegistry (KEY_ALL_ACCESS); 

Reg - & gt; RootKey=HKEY_CURRENT_USER; 
Reg - & gt; OpenKey (" Printers \ \ DevModePerUser ", true); 

Reg - & gt; Wateress GetDataType (" "); 
Int BuffLength=Reg - & gt; Wateress GetDataSize (" "); 
Byte Buff [20]. 
Reg - & gt; ReadBinaryData (" wateress ", Buff, sizeof (Buff)); 

//left left left modify Settings left left left 
If (BuffLength==0) 
{
Buff [0]=0 x01; 
Reg - & gt; WriteBinaryData (" wateress ", Buff, 1); 
} 
The else 
{
Buff [0]=Buff [0] + 1; 
Reg - & gt; WriteBinaryData (" wateress ", Buff, BuffLength); 
} 

Reg - & gt; CloseKey (); 
The delete Reg. 
}

CodePudding user response:

references 9 f ksrsoft response:

 void __fastcall TForm3: : Button2Click (TObject * Sender) 
{
TRegistry * Reg; 
Reg=new TRegistry (KEY_ALL_ACCESS); 

Reg - & gt; RootKey=HKEY_CURRENT_USER; 
Reg - & gt; nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnull