C / C++ / MFC

Member 14968771 wrote:

error: unknown type name 'num'

QString s;
for(int i = 0; i < num; ++i)
  s = va_arg(args, QString)

#define ARG_INT 1
#define ARG_LONG 2
#define ARG_DOUBLE 3
#define ARG_CHAR 4
#define ARG_STRING 5
  // ... 
#define ARG_END -1

int var_arg_fn(int arg, ...)
{
    va_ist args;
    va_start(args, arg);
    while(arg != ARG_END) {
        switch(arg) {
           case ARG_INT :
           {
              int i = va_arg(args, int);
              // ...
              break;
           }
           case ARG_DOUBLE :
           {
              double d = va_arg(args, double);
               // ...
              break;
           }
           // ... etc ...
           default:
              // handle error, maybe 
        }
        arg = va_arg(args, int);
    }
}
// and then call it like
var_arg_fn(ARG_INT, 1, ARG_DOUBLE, 3.2, ARG_STRING, strvar, ARG_END); 

while(num--)
{
   s = val_arg(args, QString);
   // ...
}

Member 14968771 wrote:

PS I did post same request on QT forum

Quote:

The GetDC function retrieves a handle to a device context (DC) for the client area of a specified window or for the entire screen. You can use the returned handle in subsequent GDI functions to draw in the DC. The device context is an opaque data structure, whose values are used internally by GDI.

I am writing a pie chart using pie and ellipse first doing CreateCompatableBitmap Selecting to mem dc but the example will work

ForNow wrote:

Mircea provided an example that will work for me