C / C++ / MFC

class Buffer {
	public:
		Buffer(unsigned nSize) : m_pBuffer(NULL), m_nLength(nSize) {
			if (nSize > 0) {
				m_pBuffer = new BYTE[nSize];
				if (m_pBuffer == NULL) {
					m_nLength = 0;
					//you ran out of memory, do something
				}
			}
		}
		~Buffer() {
			if (m_pBuffer != NULL) {
				delete []m_pBuffer;
			}
		}
		unsigned GetLength() {
			return m_nLength;
		}
		BYTE &operator[](unsigned nIndex) {
			if (nIndex >= m_nLength) {
				//error somehow
			}
			return m_pBuffer[nIndex];
		}
		BYTE *operator*() {
			return m_pBuffer;
		}

	private:
		BYTE *m_pBuffer;
		unsigned nLength;
};

Buffer bufData(64);
strcpy(*bufData, "hello world"); //the operator*() can be used to get a pointer to the data
//print the length
printf("The valid range is 0-%u\n", bufData.GetLength() - 1); //remember indices start at 0 and go to n-1
printf("The 2nd character is \'%c\'\n", bufData[1]); //Again, indices start at 0 making the 2nd element index 1
//The buffer automatically cleans up its memory when it goes out of scope

#define _countof(array) (sizeof(array)/sizeof(array[0]))

goldenrose9 wrote:

how to get the upper bound and lower bound of an array

BYTE *pByte = new BYTE[64];

PathCompactPath(pDC->GetSafeHdc(),strMPGFilePath.GetBuffer(MAX_PATH),oRc.Width());
strMPGFilePath.ReleaseBuffer();

MsmVc wrote:

I try to run dos command through mfc vc++.

#include <windows.h>
#include <stdio.h>

char * ExecuteCMD(char * command)
{
		SECURITY_ATTRIBUTES sec;
		PROCESS_INFORMATION pi;
        STARTUPINFO si;
		HANDLE hOutR, hOutW;
		DWORD BTAvail;
		char * Result = NULL;
		char * cmdline = NULL;
		char cmdpath[256];
		OSVERSIONINFO OSVersionInfo;
		DWORD Read = 0;

			ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
			ZeroMemory(&sec, sizeof(SECURITY_ATTRIBUTES));
			sec.nLength = sizeof(SECURITY_ATTRIBUTES);
			sec.bInheritHandle = TRUE;
			sec.lpSecurityDescriptor = NULL;
	
	if (CreatePipe(&hOutR, &hOutW, &sec, 0)) 
	{
				ZeroMemory(&si, sizeof(STARTUPINFO));
				si.cb = sizeof(STARTUPINFO);
				si.hStdOutput = hOutW;
				si.dwFlags = STARTF_USESTDHANDLES|STARTF_USESHOWWINDOW;

			cmdline = (char *) GlobalAlloc(GMEM_FIXED, (7 + lstrlen(command)));
			lstrcat(lstrcpy(cmdline, " /a /c "), command);

			OSVersionInfo.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
			GetVersionEx (&OSVersionInfo);

			if (OSVersionInfo.dwPlatformId == VER_PLATFORM_WIN32_NT)
			{
				GetEnvironmentVariable("ComSpec", cmdpath, 2048);
			}

		if (CreateProcess(cmdpath, cmdline, &sec, &sec, TRUE, NORMAL_PRIORITY_CLASS, NULL, NULL, &si, &pi))
		{
			WaitForSingleObject(pi.hProcess, INFINITE);
			CloseHandle(pi.hThread);
			CloseHandle(pi.hProcess);
			PeekNamedPipe (hOutR, NULL, 0, NULL, &BTAvail, NULL);
				if (BTAvail > 0)
				{
					Result = (char *) GlobalAlloc(GMEM_FIXED, BTAvail + 1);
					ReadFile(hOutR, Result, BTAvail, &Read, NULL);
					Result[BTAvail] = '\0';
					OemToChar(Result, Result);
					return Result;
				}
		}
}
	return NULL;
}

int main(int argc, char **argv)
{
	char *cmd = ExecuteCMD("dir");
	puts(cmd);
}

typedef std::vector<std::string>   WidgetIds;    
typedef std::map<std::string, int> WidgetPrices;

Madhu Nair wrote:

typedef std::vector<std::string> WidgetIds;
typedef std::map<std::string, int=""> WidgetPrices;

Will be global variables in second approach, are you OK with that ?

asincero wrote:

I can't think of any negatives to this approach

john5632 wrote:

I need to change the image size using gdi+.