45 天系列：CodeProject VC++ 论坛问答 - VI

MFC

WINDOW32

通用

有趣

答案

MFC

1. 将 COleDataTimeSpan 对象（天）设置为一天
2. 将 COleDataTime 对象（日期）设置为所需年份的所需月份
3. 构建日期递增循环 (date += day)
当 (sat) != date.GetDayOfWeek() 时循环两次
4. 现在您 (date) 位于第二个星期六

  COleDateTime dt(year,month,1,0,0,0);
  int add = 14 - dt.GetDayOfWeek();
  dt += add;
 

// First get the MDI frame window
CMDIFrameWnd* pFrame = (CMDIFrameWnd*)AfxGetApp()->m_pMainWnd;
 
// !Here we get the active MDI child window!
CMDIChildWnd* pChild = (CMDIChildWnd*)pFrame->GetActiveFrame();
 
// Alternatively you can use    
// CMDIChildWnd* pChild = pFrame->MDIGetActive();
       
// !Get the active view attached to the active MDI child window!
CMyView* pView = (CMyView*)pChild->GetActiveView();
 
// !Get the active document!
CMyDoc* pDoc = (CMyDoc*)pChild->GetActiveDocument();

ULONG nVal;
CString str = _T("0x4335");
nVal = _tcstol(str, NULL, 0)

#include <sstream>
int GetIntFromHexString(const char* HexString)
{
	int val;
	std::istringstream(HexString) >> std::hex >> val;
	return val;
}

case NM_DBLCLK:
	// Get the double clicked item
	HTREEITEM hItem = (HTREEITEM)SendMessage(((LPNMHDR) lParam)->hwndFrom,TVM_GETNEXTITEM,TVGN_CARET,0);
	TVITEM tvi;
	tvi.mask  = TVIF_PARAM;
	tvi.hItem = hItem;
	// Get the lParam value asociated with this item 
	SendMessage(((LPNMHDR) lParam)->hwndFrom,TVM_GETITEM,0,(int)&tvi);
	break;
 

WINDOW32

 
    DWORD charsNeeded; 
    GetAllUsersProfileDirectory(NULL, &charsNeeded); TCHAR *FolderPath = new 
    TCHAR[charsNeeded + 1]; GetAllUsersProfileDirectory(FolderPath, &charsNeeded);
    

    delete []FolderPath;
    

int RunAppAndWait(char *cmd)  // where "cmd" is the command line with args
{
 PROCESS_INFORMATION ProcInfo;
 STARTUPINFO StartInfo;
 int exit_status = 0;
 
 memset(&StartInfo, 0, sizeof(StartInfo));
 StartInfo.cb = sizeof(StartInfo);
 if (CreateProcess(NULL, cmd, NULL, NULL, FALSE, 0, NULL, NULL, &StartInfo,  &ProcInfo))
 {
  WaitForSingleObject(ProcInfo.hProcess, INFINITE); // wait for the command to finish
  GetExitCodeProcess(ProcInfo.hProcess, (unsigned long *)&exit_status);
  CloseHandle(ProcInfo.hProcess);
  CloseHandle(ProcInfo.hThread);
  return exit_status;
 }
 
 return 1;  // non-zero = failed
}

HFONT FAR PASCAL MyCreateFont( void ) 
{ 
    CHOOSEFONT cf; 
    LOGFONT lf; 
    HFONT hfont; 
 
 
    // Initialize members of the CHOOSEFONT structure.  
    cf.lStructSize = sizeof(CHOOSEFONT); 
    cf.hwndOwner = (HWND)NULL; 
    cf.hDC = (HDC)NULL; 
    cf.lpLogFont = &lf; 
    cf.iPointSize = 0; 
    cf.Flags = CF_SCREENFONTS; 
    cf.rgbColors = RGB(0,0,0); 
    cf.lCustData = 0L; 
    cf.lpfnHook = (LPCFHOOKPROC)NULL; 
    cf.lpTemplateName = (LPSTR)NULL; 
    cf.hInstance = (HINSTANCE) NULL; 
    cf.lpszStyle = (LPSTR)NULL; 
    cf.nFontType = SCREEN_FONTTYPE; 
    cf.nSizeMin = 0; 
    cf.nSizeMax = 0; 
 
 
    // Display the CHOOSEFONT common-dialog box.  
    // How to set the defalut font name or size before call this function??? 
    ChooseFont(&cf); 
 
 
    // Create a logical font based on the user's  
    // selection and return a handle identifying  
    // that font.   
    hfont = CreateFontIndirect(cf.lpLogFont); 
    return (hfont); 
} 

bool GetTimeFormattedBySystem(const SYSTEMTIME& sSomeTime,
                              CString& cszReceiver)
{
  static const int iTimeStrLen(40);
  static TCHAR szResult[iTimeStrLen];
  
  cszReceiver.Empty();
 
  if (GetTimeFormat(LOCALE_USER_DEFAULT,
                    0,
                    &sSomeTime,
                    NULL,
                    szResult,
                    iTimeStrLen)) {
    cszReceiver = szResult;
  }
 
  return (0 < cszReceiver.GetLength());
}

	HANDLE hProc = GetCurrentProcess();
	PROCESS_MEMORY_COUNTERS_EX info;
	info.cb = sizeof(PROCESS_MEMORY_COUNTERS_EX);
	GetProcessMemoryInfo(hProc, (PROCESS_MEMORY_COUNTERS*)&info, info.cb);
	

BOOL CALLBACK DlgProc(HWND hDlg, UINT nMessage, WPARAM wParam, LPARAM lParam) {
	switch (nMessage) { 
		case WM_INITDIALOG: 
			//This is where you do all your initialisation. This is the first place after all the controls have been created, so you can use GetDlgItem()
			return TRUE; 
 
		case WM_COMMAND:
			//This is the same as it is in the WndProc, handle button clicks, etc...
			switch (LOWORD(wParam)) {
				case IDOK: //This is usually the OK or Done button
					return TRUE; 
 
				case IDCANCEL: //This is usually the Close or Cancel button
					DestroyWindow(hDlg); //close the dialog
					return TRUE;
			}
			break;
            } 
    } 
    return FALSE; 
} 
 

void DisplayDynamicDialog(HWND hParent) {
	HMODULE hModule = LoadLibrary("Resources.dll");
	if(hModule != NULL) {
		hDialog = CreateDialog(hModule, MAKEINTRESOURCE(ID_DIALOG), hParent, (DLGPROC)DlgProc); 
		ShowWindow(hDialog, SW_SHOW);
		FreeLibrary(hModule); //This might need to be called later, after the dialog has been closed since it is modeless
	}
}

通用

class A
{
} ;
A &a1 = * (new A ) ;

DWORD dwValue = (bits8 << 24) | bits24;
// or
DWORD dwValue = (bits24 << 8) | bits8;

bits8 = dwValue & 0xFF;
bits24 = dwValue >> 8;
// or
bits24 = dwValue & 0xFFFFFF;
bits8 = dwValue >> 24;

int CreateArray(void** data, unsigned int* size)
{
//allocates some array and assigns it to data
}
 
int main()
{
unsigned char* data = 0;
unsigned int size;
int res = CreateArray(&data, &size);
}
 

int res = CreateArray((void **) &data, &size);

• static_cast 用于在两个相关类型之间进行转换，例如从一个数字类型到另一个数字类型。转换可能会导致数据丢失，但没有转换运算符代码无法编译；编译器可能会生成警告。

  char a, b;
  int x = 123;
  double y = 123.456;
  a = static_cast(x); // From int to char
  b = static_cast(y); // From double to char
  

• reinterpret_cast 用于在两个不相关类型之间进行转换，通常是指针，例如从指向结构的指针到指向 char 的指针。没有转换运算符代码无法编译；编译器会生成错误。

  POINT pt = { 10, 21 };
  unsigned char *pb = reinterpret_cast(&pt);
  // Print to screen the content of the structure in raw format
  for(int i = 0; i < sizeof(POINT); i++)
     printf("%02X  ", pb[i]);
     

foo *p = new foo;
 

foo *p = malloc( sizeof( foo ) );
 

• 显式地在其定义中使用 inline 关键字
• 在类的体部定义函数

#include <iostream>
#include <string>
#include <iomanip>
#include <sstream>

int main()
{	
	// Test numbers - num1 declared as HEX,  num2 as DEC
	const unsigned int num1 = 0x1234, num2 = 1234;
 
	// We will use std::ostringstream for the conversion
	std::ostringstream oss;
	
	// First num to Hex
        // "0x" is optional if you don't need it you can use "oss << std::hex << num1;"
	oss << "0x" << std::hex << num1; 
	std::string strFirstNumHex = oss.str();
        // Clear the content of the string buffer for later use
	oss.str(std::string());
 
	// Second num to Hex
        // "0x" is optional if you don't need it you can use "oss << std::hex << num2;"
	oss << "0x" << std::hex << num2;
	std::string strSecondNumHex = oss.str();
        // Clear the content of the string buffer for later use
	oss.str(std::string());
 
	// First num to Dec
	oss << std::dec << num1;
	std::string strFirstNumDec = oss.str();
        // Clear the content of the string buffer for later use
	oss.str(std::string());
 
	// Second num to Dec
	oss << std::dec << num2;
	std::string strSecondNumDec = oss.str();
	
	// This line prints: Numbers in HEX: 0x1234, 0x4d2       Numbers in DEC: 4660, 1234
	std::cout << "Numbers in HEX: " << strFirstNumHex << ", " << strSecondNumHex << "\t"
	          << "Numbers in DEC: " << strFirstNumDec << ", " << strSecondNumDec;
 
	std::cin.get();
	return 0;
}

rename_namespace("NewName")

有趣

1. 读取不带日期的 JPG
2. 将日期文本绘制到图像上
3. 将图像保存为新的 JPG
4. 等待 23.9999999 小时
5. 转到 1

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