使用 BitBlt 捕获桌面像素颜色
现在我正在使用 GetPixel() 从桌面检索大约 64 个像素以获得它们的颜色。我读到有关 GetPixel() 速度很慢的消息，但认为这对于几个像素来说并不重要，但每次运行该例程大约需要 1.5 秒。经过一些研究后，我得出的结论是 bitblt 似乎就是我正在寻找的。我想要做的是抓取桌面的定义区域（包括所有窗口），然后抓取给定偏移处的像素颜色。这就是我现在正在做的事情：
for (y=0;y<=7;y++) {
for (x=0;x<=7;x++) {
//gameScreen is a struct containing the offset from the top left of the monitor
//to the area of the screen I need
grid[y][x]=getColor(gameScreen.x+((x*40)+20),gameScreen.y+((y*40)+20));
}
}
int getColor(int x, int y) {
//create new point at given coordinates
POINT point;
point.x=x;
point.y=y;
//convert to logical points
DPtoLP(desktopDC,&point,2);
//get pixel color
//desktopDC is an HDC from GetWindowDC(GetDesktopWindow())
int pixel=GetPixel(desktopDC,point.x,point.y);
return pixel;
}
我已经找到了大量的教程和文档，但是对于 Windows API 来说，它们对我来说并没有多大用处。谢谢！
Right now I'm using GetPixel() to retrieve about 64 pixels from the desktop in order to obtain their color. I read about GetPixel() being slow but didn't think it would matter for a few pixels but it's taking like 1.5 seconds each time I run the routine. After doing some research I've concluded that bitblt seems like what I'm looking for. What I want to do is grab a defined area of the desktop (including all windows) and then grab pixel colors at given offsets. Here's what I'm doing now:
for (y=0;y<=7;y++) {
for (x=0;x<=7;x++) {
//gameScreen is a struct containing the offset from the top left of the monitor
//to the area of the screen I need
grid[y][x]=getColor(gameScreen.x+((x*40)+20),gameScreen.y+((y*40)+20));
}
}
int getColor(int x, int y) {
//create new point at given coordinates
POINT point;
point.x=x;
point.y=y;
//convert to logical points
DPtoLP(desktopDC,&point,2);
//get pixel color
//desktopDC is an HDC from GetWindowDC(GetDesktopWindow())
int pixel=GetPixel(desktopDC,point.x,point.y);
return pixel;
}
I've found a decent amount of tutorial and documentation, but being so new to the windows API they aren't doing to much for me. Thanks!
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您可能想要：
如果您定期执行此操作，那么您应该只执行前三个步骤一次，重复
BitBlt< /code> 和GetDIBits，以及程序完成时的最后三个。You're probably wanting:
If you're doing this periodically, then you should do the first three steps only once, repeat
BitBltandGetDIBits, and the last three when your program finishes.