Teach Yourself Borland C++ in 14 Days - portal

Creating Applications in C++Builder
130: //
131: Application->ProcessMessages();
132: //
133: // take a short nap so the animation doesn’t go too fast
134: //
135: Sleep(20);
136: }
Listing 9.4. JJRes.rc.
1: #define IDS_UP 101
2: #define IDS_DOWN 102
3:
4: STRINGTABLE
5: {
6: IDS_UP, “Up”
7: IDS_DOWN, “Down”
8: }
9:
10: ID_WAVEUP WAVE “up.wav”
11: ID_WAVEDOWN WAVE “down.wav”
12:
13: ID_BITMAP1 BITMAP LOADONCALL MOVEABLE DISCARDABLE IMPURE
14: {
15: ’42 4D 76 02 00 00 00 00 00 00 76 00 00 00 28 00'
16: ’00 00 20 00 00 00 20 00 00 00 01 00 04 00 00 00'
17: //
18: // remainder of bitmap resources follow
Notice lines 23 and 24 in the header for the main form class in Listing 9.2. Line 23
ANALYSIS
declares a bool data member that is used to determine when to stop the animation.
The class member function declared on line 24 is used to display the bitmap in the Image
component.
In Listing 9.3 you will notice that two Windows API functions are used to load the string and
wave file resources. On line 78, the LoadString() function loads a string resource into a text
buffer based on the numerical identifier of the string (see Listing 9.4 to see how the string
resources are created). The string is then assigned to the Caption property of the label
component on the form. On line 83, the PlaySound() function is used to play a wave file
contained as a resource. The SND_ASYNC flag used with the PlaySound() function tells
Windows to play the sound and immediately return control to the program. This allows the
animation to continue while the sound is being played. The SND_RESOURCE flag tells Windows
that the sound is contained as a resource and not as a file on disk. Both the LoadString() and
PlaySound() functions use the HInstance global variable to tell Windows to look in the
executable file for the resources.
347
9