Problem Creating a Color BITMAP

[valinc]

Hi,

I've created a dummy char buffer and am trying to write the values to bitmap to display.

My code fails on the SetDIBits functions, it returns a zero.

Here's my code:

// Create Dummy Image Array

unsigned char * imageArray1;
int size=48 * 48 * 3 ;
imageArray1=new unsigned char[size];
::memset(imageArray1,192,size);


//void pointer to the Image Array

void* lpImageBits=imageArray1;


//Create Compatible Bitmap

HDC hDC,hMemoryDC;
hDC=::GetDC(this.m_hWnd);
HBITMAP hBitmap=CreateCompatibleBitmap(hDC,48,48);
if (hBitmap==NULL) MessageBox("Bad hBitmap","",0);


//Get BITMAP that corespondes the the image array.

BITMAP bm;
GetObject((HGDIOBJ)hBitmap, sizeof(BITMAP), &bm);
bm.bmBits=imageArray1;

// This function Fails and returns 0 which means it didn't write any data

int rtLines=SetDIBits(hDC,hBitmap,0,47,imageArray1,(BITMAPINFO*)&bm,DIB_RGB_COLORS);

// Create Compatible DC and Select hBitmap in it.

hMemoryDC=::CreateCompatibleDC(hDC);
if (hMemoryDC==NULL) MessageBox("Error Creating Compatible DC","",0);

void* returnBitmap=SelectObject(hMemoryDC,hBitmap);
if (returnBitmap==NULL) MessageBox("Error SelectObject","",0);

//BitBlt to Screen. Only get black rectangle. No data written.

error_Level=::BitBlt(hDC,150,20,48, 48, hMemoryDC, 0, 0, SRCCOPY);

Any ideas?

Much appreciated.

Regards
valinc

[jeroendeleeuw]

Why don't you just create the bitmapheader yourself and write it to disk with the WriteFile() API.

[salehhamadeh]

It would be better to make a struct that will have your .bmp variables
Check this link: http://www.computing.net/answers/pro...lly/14840.html

[srelu]

You're mixing functions for device dependent bitmaps (CreateCompatibleBitmap) with functions for device independent bitmaps (SetDIBits).

In order to make SetDIBits to work, you need to create the bitmap using CreateDIBSection.