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[Invitado]

necesito capturar el icono del cursor fuera y dentro de la aplicacion. No logro capturar fuera del Form. Quiero hacer captura del icono del cursor del raton por ejemplo cuando esta sobre el escritorio.

[Cesar C. Salazar Gonzalez]

Para ello debes, utilizar algo que se denomina "hook", mira te paso un ejemplo para que te des una idea, lo encontre buscando en la red...


/**********uhook**************
//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "UHook.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------


void __fastcall TForm1::Button1Click(TObject *Sender)
{
/* DllHandle=LoadLibrary("HookDll.dll");
MOUSEHOOKFCT InstHook=reinterpret_cast<MOUSEHOOKFCT>(GetProcAddress(DllHandle,"_InstallMouseHook"));

*/

DllHandle=LoadLibrary("HookDll.dll");
PRINTHOOKFCT InstHook=reinterpret_cast<PRINTHOOKFCT>(GetProcAddress(DllHandle,"_CCInstallPrintHook"));

if(!InstHook())
{
Label1->Caption="no se puede instalar el Gancho!";
}
else Label1->Caption="Gancho Instalado!";
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{


/* MOUSEHOOKFCT RemHook=reinterpret_cast<MOUSEHOOKFCT>(GetProcAddress(DllHandle,"_RemoveMouseHook"));

*/
PRINTHOOKFCT RemHook=reinterpret_cast<PRINTHOOKFCT>(GetProcAddress(DllHandle,"_CCRemovePrintHook"));
if(!RemHook())
{
Label1->Caption="No se Puede Remover el Gancho!";
}
else Label1->Caption="Gancho Desinstalado!";
FreeLibrary(DllHandle);

}
//---------------------------------------------------------------------------
/********************uhook.h*******************/
//---------------------------------------------------------------------------

#ifndef UHookH
#define UHookH
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>

// place this before the class declaration
typedef bool (__stdcall *PRINTHOOKFCT)();
typedef bool (__stdcall *MOUSEHOOKFCT)();

//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published: // IDE-managed Components
TButton *Button1;
TButton *Button2;
TLabel *Label1;
void __fastcall Button1Click(TObject *Sender);
void __fastcall Button2Click(TObject *Sender);
private: // User declarations
HINSTANCE DllHandle;
public: // User declarations
__fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif

/****************hjookdll.cpp*********************/
//---------------------------------------------------------------------------

#include <vcl.h>
#include <windows.h>
#pragma hdrstop
//---------------------------------------------------------------------------
// Important note about DLL memory management when your DLL uses the
// static version of the RunTime Library:
//
// If your DLL exports any functions that pass String objects (or structs/
// classes containing nested Strings) as parameter or function results,
// you will need to add the library MEMMGR.LIB to both the DLL project and
// any other projects that use the DLL. You will also need to use MEMMGR.LIB
// if any other projects which use the DLL will be performing new or delete
// operations on any non-TObject-derived classes which are exported from the
// DLL. Adding MEMMGR.LIB to your project will change the DLL and its calling
// EXE's to use the BORLNDMM.DLL as their memory manager. In these cases,
// the file BORLNDMM.DLL should be deployed along with your DLL.
//
// To avoid using BORLNDMM.DLL, pass string information using "char *" or
// ShortString parameters.
//
// If your DLL uses the dynamic version of the RTL, you do not need to
// explicitly add MEMMGR.LIB as this will be done implicitly for you
//---------------------------------------------------------------------------
// Exported functions
extern "C" __declspec(dllexport)bool InstallMouseHook();
extern "C" __declspec(dllexport)bool RemoveMouseHook();

// Callback Procedure Declaration
LRESULT CALLBACK MouseProc(int code, WPARAM wParam, LPARAM lParam);

// Global variables
HHOOK HookHandle;
HINSTANCE DllInstance;
bool IsInRect=false;

#pragma argsused
int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void* lpReserved)
{
DllInstance=hinst;
return 1;
}
//---------------------------------------------------------------------------

bool InstallMouseHook()
{
HookHandle=SetWindowsHookEx(WH_MOUSE,reinterpret_cast<HOOKPROC>(MouseProc),DllInstance,0);
if (HookHandle==NULL)
return false;
else
return true;
}
//---------------------------------------------------------------------------
bool RemoveMouseHook()
{
if(UnhookWindowsHookEx(HookHandle)==0){
return false;
}else
return true;
}
//---------------------------------------------------------------------------
LRESULT CALLBACK MouseProc(int code, WPARAM wParam, LPARAM lParam)
{
if (code<0){
return CallNextHookEx(HookHandle,code,wParam,lParam);
}
//Define a rectangle
POINT MousePos;
RECT UpperRightCorner=Rect(Screen->Width-2,0,Screen->Width,2);
//Get the mouse position
GetCursorPos(&MousePos);
//Check if the mouse is in the rectangle
if((PtInRect(&UpperRightCorner,MousePos))&&(IsInRect==false))
{
//if the mouse is in the rectangle, launch the screensaver
IsInRect=true;
SendMessage(GetDesktopWindow(),WM_SYSCOMMAND,SC_SCREENSAVE,0); // activa el quemador

// SendMessage(GetDesktopWindow(),WM_SYSCOMMAND,SC_TASKLIST,0); //activa la bara de tareas

}
else IsInRect=false;
//Call the next hook in the chain
return CallNextHookEx(HookHandle,code,wParam,lParam);
}
/***********fin*********************/


si te das cuenta,
_________________

[Invitado]

MUUUUUUUUchisimas gracias