C / C++ / MFC

void CTestDlg::OnBtnClickedCancel()
{ // [Cancel] key handler.
  CWnd* pWnd = GetFocus();
  if(pWnd == dynamic_cast<CWnd*>(&m_ctlEditMultiline)) {
    // When the focus is in the multi-line edit control.
    return; // Ignore.
  }
  OnCancel(); // Exit dialog box.
}

J_E_D_I wrote:

RegQueryValueEx
(MyKey, "1400\0", NULL, &type, (LPBYTE)&res[0], &size);

J_E_D_I wrote:

(I swear yesterday I saw my message succesfully posted on the website, but today I can't find it anymore! So I'm posting it again).

J_E_D_I wrote:

RegQueryValueEx(hKey, "1400", NULL, NULL,(LPBYTE)&KeyEn, &dwLen);
cout << "And the value is.....: " << *(LPBYTE)&KeyEn << endl;

RegQueryValueEx(hKey, "1400", NULL, NULL, (LPBYTE)&dwKeyEn, &dwLen);
cout << "And the value is.....: " << dwKeyEn << endl;

act_x wrote:

2)Typically there are applications that are launched the first time when an event occurs .
Say Windows media player is launched when i connect my music player
However I would want to understand how these applications get notified when subsequent events ( non-first time events ) occur ? Is there a standard pattern to follow ?

// legacy C code

#include "NewCppAPI.h"

void legacy_Code()
{
	// doing things with stable code
	// call the new code
	int iResult = NewCppAPI();
	// check return code
}

// NewCppAPI.h

#ifdef __cplusplus
extern "C" {
#endif

int NewCppAPI();

#ifdef __cplusplus
}
#endif

// NewCppAPI.cpp

#include "NewCppAPI.h"

int NewCppAPI()
{
	int iResult = 0;
	
	// do the new stuff

	return iResult;
}

// legacycode.h

extern int stableAPI(int icount);

// NewCppAPI.cpp

extern "C" {
#include "legacycode.h"
}

void CppFunction()
{
	// do new things
	std::vector <int> vNumbers;
	vNumbers.push(1);
	vNumbers.push(2);
	vNumbers.push(3);

	// call the stable code
	int iResult = stableAPI(vNumbers.size());
}

int CopyCppData(char * pszBuffer, int * ilength);