Thread: Const pointer conversion.

Code:

void render(void)
{
		int letterWidth=48; // the uniform width of each letter block
		int letterHeight=48; // the uniform height of each letter block
		int destx = 48; // the top-left X coordinate for the first letter
		int desty = 96; // the top-left Y coordinate for the first letter
		char *message = "HELLO WORLD";
		// This variable will hold the pointer to the back buffer
		IDirect3DSurface9* backbuffer = NULL;
		// Check to make sure you have a valid Direct3D device
		if( NULL == pd3dDevice )
		return;
		// Clear the back buffer to a blue color
		pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET,
		D3DCOLOR_XRGB(0,0,255), 1.0f, 0 );
		// Retrieve a pointer to the back buffer
		pd3dDevice->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO, &backbuffer);
		// Set up a counter variable to hold the letter’s position on the screen
		int count=0;
		// Loop through the message one character at a time
		for ( char *c = message; c != " "; c++ )
		{
			// source and destination rectangles
			RECT src;
			RECT dest;
			// Set the source rectangle
			int srcY = ( ( ( *c - 'A' ) / 6 ) ) * letterHeight;
			int srcX = ( ( ( *c - 'A' ) %7 ) * letterWidth );
			src.top = srcY ;
			src.left = srcX;
			src.right = src.left + letterWidth;
			src.bottom = src.top + letterHeight;
			// Set the dest rectangle
			dest.top = desty;
			dest.left = destx + ( letterWidth * count );
			dest.right = dest.left + letterWidth;
			dest.bottom = dest.top + letterHeight;
			// Increase the letter count by one
			count++;
			// Copy this letter to the back buffer
			pd3dDevice->StretchRect( srcSurface, // the source surface
			src, // the source rectangle
			backbuffer, // the destination surface
			dest, // destination rectangle
			D3DTEXF_NONE); // the filter to apply

		}
		// Present the back buffer contents to the display
		pd3dDevice->Present( NULL, NULL, NULL, NULL );
}

c:\documents and settings\shiju\desktop\projects\spike\loadpartbitm ap\loadpartbitmap\winmain.cpp(121) : error C2440: 'initializing' : cannot convert from 'RECT' to 'const RECT *'

I think StretchRect expect a const pointer. Please help

Code:

c:\documents and settings\shiju\desktop\projects\spike\loadpartbitm ap\loadpartbitmap\winmain.cpp(121) : error C2440: 'initializing' : cannot convert from 'RECT' to 'const RECT *'

Pointers automatically convert to const when needed. The real problem is you aren't passing pointers in the first place.

Code:

			// Copy this letter to the back buffer
			pd3dDevice->StretchRect( srcSurface, // the source surface
			&src, // the source rectangle
			backbuffer, // the destination surface
			&dest, // destination rectangle
			D3DTEXF_NONE); // the filter to apply

> for ( char *c = message; c != " "; c++ )
This loop will never exit since you're comparing the "MESSAGE" (then "ESSAGE" and "SSAGE" string with another string with " ".
These two pointers will never match (until one randomly catches up with the other).
If you're really looking for the space, then
for ( char *c = message; *c != ' '; c++ )