C / C++ / MFC

char *OPTIONS_ENUMS[] = {"OPT_1","OPT_2","OPT_3","OPT_4", NULL};

char *OPTIONS_ENUMS[5] = {"OPT_1","OPT_2","OPT_3","OPT_4"}; // This works
for(int j = 0; j < 100; j++)
{   
    if(OPTIONS_ENUMS[j] == NULL)     
    return j;
}

std::vector<LPCSTR> OPTIONS_ENUMS = {"OPT_1","OPT_2","OPT_3","OPT_4"};

#define ARRAY_SIZE(_Array) (sizeof(_Array) / sizeof(_Array[0])) // This is the answer 

char *OPTIONS_ENUMS[] = {"OPT_1","OPT_2","OPT_3","OPT_4"}; 
for (j = 0; j < ARRAY_SIZE(OPTIONS_ENUMS); j++)
{   
    if(OPTIONS_ENUMS[j] == NULL) // will never happen   
    return j;

    // do something with OPTIONS_ENUMS[j]
}

#define ARRAY_SIZE(_Array) (sizeof(_Array) / sizeof(_Array[0])) // This is the answer

char *OPTIONS1_ENUMS[4] = {"OPT_1", "OPT_2", "OPT_3", "OPT_4"};
char *OPTIONS2_ENUMS[2] = {"OPT_1", "OPT_4"};
char *OPTIONS3_ENUMS[1] = {"OPT_1234"};
 
char* GetOptions(short enumValue, char** szOptions)
{
	int i, nOptions;
	short size;
	nOptions = 1;
	size = ARRAY_SIZE(szOptions);
	
	printf("Array Size = %d\n", size);
    // do something with OPTIONS_ENUMS[j]
}

// In the Main program call GetOptions() for 3 different sized arrays
GetOptions(1, OPTIONS1_ENUMS);
GetOptions(2, OPTIONS2_ENUMS);
GetOptions(3, OPTIONS3_ENUMS);

Andy202 wrote:

Thanks I just tested this and it did not work. The size is always 1.

Have I implemented it correct?

#define ARRAY_SIZE(_Array) (sizeof(_Array) / sizeof(_Array[0])) // This is the answer

char *OPTIONS1_ENUMS[] = {"OPT_1", "OPT_2", "OPT_3", "OPT_4"};
char *OPTIONS2_ENUMS[] = {"OPT_1", "OPT_4"};
char *OPTIONS3_ENUMS[] = {"OPT_1234"}; 

void GetOptions(short enumValue, char** szOptions, int Size)
{	
	printf("Array Size = %d\n", Size);    
}
int main()
{
	// In the Main program call GetOptions() for 3 different sized arrays
	GetOptions(1, OPTIONS1_ENUMS, ARRAY_SIZE(OPTIONS1_ENUMS));
	GetOptions(2, OPTIONS2_ENUMS, ARRAY_SIZE(OPTIONS2_ENUMS));
	GetOptions(3, OPTIONS3_ENUMS, ARRAY_SIZE(OPTIONS3_ENUMS));
}

char *OPTIONS_ENUMS[] = {"OPT_1","OPT_2","OPT_3","OPT_4", NULL};

• GetDIBits Function (Windows)[^]
• SetDIBits Function (Windows)[^]

• pinvoke.net: BITMAPINFOHEADER (structures)[^]
• pinvoke.net: GetDIBits (GDI32)[^]
• pinvoke.net: SetDIBits (GDI32)[^]
• BITMAPINFO Structure (Windows)[^]

GAJERA wrote:

CDC *dc=NULL;
dc->Attach()

1. the CDC::Attach() method wants an HDC as parameter, then this code doesn't compile. To which HDC do you want to attach?
2. you have initialized dc to NULL and then you use that pointer to call one of its non-static members: this will give you a memory protection fault.