First-chance exception in Cairo on exit

When use Cairo (http://cairographics.org/ ), you may meet the nasty question: "First-chance exception at 0x68e629dc in test.exe: 0xC0000005: Access violation reading location 0xabababa7". This error message only occurs when the app  is on exit.

 

What's First-chance exception in Cairo on exit? and does it matter? See these discusses:

http://stackoverflow.com/questions/3610888/cairo-error-message-on-exit

 

and

 

http://blogs.msdn.com/b/davidklinems/archive/2005/07/18/440150.aspx

 

In general, it is harmless. so don't warry about that and feel at ease to use cairo.

 

Sample code bellow:

 

CChildView::CChildView() { testsurface = cairo_image_surface_create_from_png("BlackShinyBackground.png"); } CChildView::~CChildView() { cairo_surface_destroy(testsurface); } void CChildView::OnPaint() { CPaintDC dc(this); cairo_surface_t *surface = cairo_win32_surface_create(dc.m_hDC); cairo_t *cr = cairo_create (surface); cairo_set_source_surface(cr, testsurface, 0, 0); cairo_paint(cr); cairo_destroy (cr); cairo_surface_destroy (surface); }

 

or another one:

 

// test.cpp : Defines the entry point for the console application. // #include "stdafx.h" // Use cario #include "../include/cairo/cairo-win32.h" // exam_draw_img #include "../include/cairo/cairo-pdf.h" // exam_draw_pdf #include "../include/cairo/cairo-svg.h" // exam_draw_svg #pragma comment(lib, "../lib/cairo.lib") void exam_draw_png() { cairo_surface_t *surface; cairo_t *cr; surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 640, 480); cr = cairo_create (surface); cairo_select_font_face (cr, "serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD); cairo_set_font_size (cr, 32.0); cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); cairo_move_to (cr, 100.0, 100.0); cairo_show_text (cr, "This is an Example using PNG as drawing output!"); cairo_rectangle(cr,10,10,100,100); cairo_set_line_width(cr,10); cairo_set_source_rgb(cr,0,0,1); cairo_stroke(cr); cairo_move_to(cr,0,0); cairo_line_to(cr,100,100); cairo_set_source_rgb(cr,1,0,0); cairo_stroke(cr); cairo_surface_write_to_png (surface, "c://exam_draw_png.png"); cairo_destroy (cr); cairo_surface_destroy (surface); } void exam_draw_pdf() { cairo_surface_t *surface; cairo_t *cr; surface = cairo_pdf_surface_create ("c://exam_draw_pdf.pdf", 640, 480); cr = cairo_create (surface); cairo_select_font_face (cr, "serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD); cairo_set_font_size (cr, 32.0); cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); cairo_move_to (cr, 100, 100); cairo_show_text (cr, "This is an Example using PDF as drawing output!"); cairo_rectangle(cr,10,10,100,100); cairo_set_line_width(cr,10); cairo_set_source_rgb(cr,0,0,1); cairo_stroke(cr); cairo_move_to(cr,0,0); cairo_line_to(cr,100,100); cairo_set_source_rgb(cr,1,0,0); cairo_stroke(cr); cairo_show_page (cr); cairo_destroy (cr); cairo_surface_destroy (surface); } void exam_draw_svg() { cairo_surface_t *surface; cairo_t *cr; surface = cairo_svg_surface_create ("c://exam_draw_svg.svg", 320, 48); cr = cairo_create (surface); cairo_set_source_rgb (cr, 0.627, 0, 0); cairo_select_font_face (cr, "serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL); cairo_set_font_size (cr, 24.0); cairo_move_to (cr, 10.0, 34.0); cairo_show_text (cr, "This is an Example using SVG as drawing output!"); cairo_destroy (cr); cairo_surface_destroy (surface); } int _tmain(int argc, _TCHAR* argv[]) { exam_draw_png(); exam_draw_svg(); exam_draw_pdf(); return 0; }