Not displaying Mouse cursor

问题

I am developing Mac desktop application, where i am capturing the screen using

CGImageRef screenShot = CGWindowListCreateImage(CGRectInfinite, kCGWindowListOptionAll, kCGNullWindowID, kCGWindowImageDefault);

and display the screen shot, The problem is, i am expecting it should show the mouse cursor too, but its not showing, do i need to enable any settings for that ?

I tried following before calling this function

CGDisplayShowCursor(kCGDirectMainDisplay);

CGAssociateMouseAndMouseCursorPosition(true);

but it didn't work, When i checked using following

bool bCursor = CGCursorIsDrawnInFramebuffer(); /* This returns false */

bCursor = CGCursorIsVisible();  /* This returns true */

This values says, cursor was not drawn in the framebuffer ( ) but cursor is visible, I suppose only i need to do is, Draw cursor in the framebuffer, but how that is the challenge,

Thanks in advance.

回答1:

it seems, framebuffer doesn't give me the mouse cursor, so i am drawing my own, this is the code snippet , might be help full to you guys,

-(CGImageRef)appendMouseCursor:(CGImageRef)pSourceImage{
    // get the cursor image 
    NSPoint mouseLoc; 
    mouseLoc = [NSEvent mouseLocation]; //get cur

    NSLog(@"Mouse location is x=%d,y=%d",(int)mouseLoc.x,(int)mouseLoc.y);

    // get the mouse image 
    NSImage *overlay    =   [[[NSCursor arrowCursor] image] copy];

    NSLog(@"Mouse location is x=%d,y=%d cursor width = %d, cursor height = %d",(int)mouseLoc.x,(int)mouseLoc.y,(int)[overlay size].width,(int)[overlay size].height);

    int x = (int)mouseLoc.x;
    int y = (int)mouseLoc.y;
    int w = (int)[overlay size].width;
    int h = (int)[overlay size].height;
    int org_x = x;
    int org_y = y;

    size_t height = CGImageGetHeight(pSourceImage);
    size_t width =  CGImageGetWidth(pSourceImage);
    int bytesPerRow = CGImageGetBytesPerRow(pSourceImage);

    unsigned int * imgData = (unsigned int*)malloc(height*bytesPerRow);

    // have the graphics context now, 
    CGRect bgBoundingBox = CGRectMake (0, 0, width,height);

    CGContextRef context =  CGBitmapContextCreate(imgData, width, 
                                                  height, 
                                                  8, // 8 bits per component 
                                                  bytesPerRow, 
                                                  CGImageGetColorSpace(pSourceImage), 
                                                  CGImageGetBitmapInfo(pSourceImage));

    // first draw the image 
    CGContextDrawImage(context,bgBoundingBox,pSourceImage);

    // then mouse cursor 
    CGContextDrawImage(context,CGRectMake(0, 0, width,height),pSourceImage);

    // then mouse cursor 
    CGContextDrawImage(context,CGRectMake(org_x, org_y, w,h),[overlay CGImageForProposedRect: NULL context: NULL hints: NULL] );


    // assuming both the image has been drawn then create an Image Ref for that 

    CGImageRef pFinalImage = CGBitmapContextCreateImage(context);

    CGContextRelease(context);

    return pFinalImage; /* to be released by the caller */
}

来源：https://stackoverflow.com/questions/8008630/not-displaying-mouse-cursor