v0.0.4: LatestRelease <- Development (#5)

README.md

@@ -8,7 +8,8 @@ Some go scripts that can:
 * prompt folder selection
 
 ## Note:
-This only works on windows as we use windows api
+For winapi only windows works
+For x11 only linux works
 
 ## Article about the use of win32 and some of its risks
 As this package uses unsafe and syscalls and depend on the windows operating system, this article should help understand some of it

windows/winapi/go-camera-capture-image(not working)/go.mod

@@ -0,0 +1,5 @@
+module go-camera-capture-image
+
+go 1.20
+
+require golang.org/x/sys v0.12.0 // indirect

windows/winapi/go-camera-capture-image(not working)/main.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"fmt"
+	"syscall"
+	"unsafe"
+)
+
+const (
+	WM_CAP_START              = 0x400
+	WM_CAP_DRIVER_CONNECT     = WM_CAP_START + 10
+	WM_CAP_DRIVER_DISCONNECT  = WM_CAP_START + 11
+	WM_CAP_SINGLE_FRAME_OPEN  = WM_CAP_START + 70
+	WM_CAP_SINGLE_FRAME_CLOSE = WM_CAP_START + 71
+	WM_CAP_SINGLE_FRAME       = WM_CAP_START + 72
+	WM_CAP_FILE_SAVEDIB       = WM_CAP_START + 25
+	WS_VISIBLE                = 0x10000000
+	WS_CHILD                  = 0x40000000
+)
+
+var (
+	avicap32 = syscall.NewLazyDLL("avicap32.dll")
+
+	// AVICap32 API functions
+	capCreateCaptureWindowW = avicap32.NewProc("capCreateCaptureWindowW")
+	SendMessage             = avicap32.NewProc("SendMessageW")
+	DestroyWindow           = avicap32.NewProc("DestroyWindow")
+	capFileSaveDIB          = avicap32.NewProc("capFileSaveDIB")
+)
+
+func main() {
+	// Initialize the capture window
+	captureWindow := initCaptureWindow()
+
+	fmt.Println(captureWindow)
+	if captureWindow == 0 {
+		fmt.Println("Failed to initialize capture window")
+		return
+	}
+	defer DestroyWindow.Call(captureWindow)
+
+	// Start capturing
+	_, _, _ = SendMessage.Call(captureWindow, WM_CAP_DRIVER_CONNECT, 0, 0)
+
+	// Capture a single frame
+	_, _, _ = SendMessage.Call(captureWindow, WM_CAP_SINGLE_FRAME_OPEN, 0, 0)
+	_, _, _ = SendMessage.Call(captureWindow, WM_CAP_SINGLE_FRAME_CLOSE, 0, 0)
+
+	// Save the captured image
+	imageFile := "captured_image.bmp"
+	_, _, _ = SendMessage.Call(captureWindow, WM_CAP_FILE_SAVEDIB, 0, uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(imageFile))))
+
+	// Stop capturing
+	_, _, _ = SendMessage.Call(captureWindow, WM_CAP_DRIVER_DISCONNECT, 0, 0)
+
+	fmt.Println("Image saved as", imageFile)
+}
+
+func initCaptureWindow() uintptr {
+	// Create a capture window
+	title := "Live! Cam Sync 1080p"
+	titlePtr, err := syscall.UTF16PtrFromString(title)
+	if err != nil {
+		fmt.Println("Error converting title to UTF16:", err)
+		return 0
+	}
+
+	captureWindow, _, _ := capCreateCaptureWindowW.Call(
+		uintptr(unsafe.Pointer(titlePtr)),
+		uintptr(WS_VISIBLE|WS_CHILD),
+		0, 0, 320, 240,
+		0, 0,
+		0, 0,
+	)
+
+	return captureWindow
+}

windows/winapi/go-camera-capture-video(not working)/main.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+var (
+	winmm                   = syscall.NewLazyDLL("winmm.dll")
+	capCreateCaptureWindowW = winmm.NewProc("capCreateCaptureWindowW")
+	SendMessage             = winmm.NewProc("SendMessageW")
+)
+
+const (
+	WM_CAP_START             = 0x0400
+	WM_CAP_DRIVER_CONNECT    = WM_CAP_START + 10
+	WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11
+	WM_CAP_SAVEDIB           = WM_CAP_START + 25
+	WM_CAP_EDIT_COPY         = WM_CAP_START + 30
+)
+
+func main() {
+	// Initialize the Windows Multimedia API
+	hwnd := createCaptureWindow(0, 0, 0, 0, 320, 240)
+	if hwnd == 0 {
+		fmt.Println("Failed to create capture window")
+		os.Exit(1)
+	}
+	defer sendMessage(hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0)
+
+	// Connect to the default camera
+	if !sendMessage(hwnd, WM_CAP_DRIVER_CONNECT, 0, 0) {
+		fmt.Println("Failed to connect to the camera")
+		os.Exit(1)
+	}
+
+	// Start capturing
+	if !sendMessage(hwnd, WM_CAP_SAVEDIB, 0, uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("output.bmp")))) {
+		fmt.Println("Failed to capture video")
+		os.Exit(1)
+	}
+
+	fmt.Println("Press Enter to stop capturing...")
+	fmt.Scanln()
+
+	// Disconnect from the camera
+	sendMessage(hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0)
+}
+
+func createCaptureWindow(x, y, width, height, parentHwnd int, id int) uintptr {
+	title := "CaptureWindow"
+	ret, _, _ := capCreateCaptureWindowW.Call(
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(title))),
+		uintptr(0x40000000|0x10000000), // WS_VISIBLE|WS_CHILD
+		uintptr(x),
+		uintptr(y),
+		uintptr(width),
+		uintptr(height),
+		uintptr(parentHwnd),
+		uintptr(id),
+	)
+
+	return ret
+}
+
+func sendMessage(hwnd uintptr, msg uint32, wParam uintptr, lParam uintptr) bool {
+	ret, _, err := syscall.Syscall6(
+		SendMessage.Addr(),
+		4,
+		hwnd,
+		uintptr(msg),
+		wParam,
+		lParam,
+		0,
+		0,
+	)
+	if err != 0 {
+		fmt.Printf("SendMessage failed with error code: %d\n", err)
+		return false
+	}
+	return ret != 0
+}

windows/winapi/go-screenshot/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"image"
+	"image/color"
 	"image/jpeg"
 	"image/png"
 	"os"
@@ -22,6 +23,11 @@ func removeFalseFlags(err error) error {
 
 func main() {
 	run()
+
+	// Example usage of getColorAtPixel function
+	screenshot, _ := loadImage("screenshot.png")
+	r, g, b, a := getColorAtPixel(screenshot, 100, 100)
+	fmt.Printf("Color at pixel (100, 100): R=%d, G=%d, B=%d, A=%d\n", r, g, b, a)
 }
 
 func run() {
@@ -268,3 +274,31 @@ func deleteDC(hdc syscall.Handle) (uintptr, uintptr, error) {
 	}
 	return result, 0, err
 }
+
+func getColorAtPixel(img *image.RGBA, x, y int) (uint8, uint8, uint8, uint8) {
+	idx := (y-img.Rect.Min.Y)*img.Stride + (x-img.Rect.Min.X)*4
+	return img.Pix[idx], img.Pix[idx+1], img.Pix[idx+2], img.Pix[idx+3]
+}
+
+func loadImage(filename string) (*image.RGBA, error) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	img, _, err := image.Decode(file)
+	if err != nil {
+		return nil, err
+	}
+
+	rgbaImage := image.NewRGBA(img.Bounds())
+	for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
+		for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
+			r, g, b, a := img.At(x, y).RGBA()
+			rgbaImage.SetRGBA(x, y, color.RGBA{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), uint8(a >> 8)})
+		}
+	}
+
+	return rgbaImage, nil
+}

windows/winapi/go-shiny/example1/go.sum

@@ -0,0 +1,27 @@
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windows/winapi/go-shiny/example2/go.sum

@@ -0,0 +1,37 @@
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windows/winapi/go-shiny/example3-window-with-mouse-and-keyboard-interaction/go.sum

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