Create manifest file programmatically

This removes the hassle for the user to mess with manifest files. We also have control over the exact contents of the manifest file, no user errors.
bonki · Aug 20, 2018 · 9ec6100 · 9ec6100
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diff --git a/README.mdown b/README.mdown
@@ -59,32 +59,6 @@ func main() {
 }
 ```
 
-##### Create Manifest `test.manifest`
-
-```xml
-<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
-    <assemblyIdentity version="1.0.0.0" processorArchitecture="*" name="SomeFunkyNameHere" type="win32"/>
-    <dependency>
-        <dependentAssembly>
-            <assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"/>
-        </dependentAssembly>
-    </dependency>
-    <asmv3:application>
-        <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
-            <dpiAware>true</dpiAware>
-        </asmv3:windowsSettings>
-    </asmv3:application>
-</assembly>
-```
-
-Then either compile the manifest using the [rsrc tool](https://github.com/akavel/rsrc), like this:
-
-	go get github.com/akavel/rsrc
-	rsrc -manifest test.manifest -o rsrc.syso
-
-or rename the `test.manifest` file to `test.exe.manifest` and distribute it with the application instead.
-
 ##### Build app
 
 In the directory containing `test.go` run
@@ -106,22 +80,6 @@ To get rid of the cmd window, instead run
 ##### More Examples
 There are some [examples](examples) that should get you started.
 
-Application Manifest Files
-==========================
-Walk requires Common Controls 6. This means that you must put an appropriate
-application manifest file either next to your executable or embedded as a
-resource.
-
-You can copy one of the application manifest files that come with the examples.
-
-To embed a manifest file as a resource, you can use the [rsrc tool](https://github.com/akavel/rsrc).
-
-IMPORTANT: If you don't embed a manifest as a resource, then you should not launch
-your executable before the manifest file is in place.
-If you do anyway, the program will not run properly. And worse, Windows will not
-recognize a manifest file, you later drop next to the executable. To fix this,
-rebuild your executable and only launch it with a manifest file in place.
-
 Program Crashes
 ===============
 By default Go uses os threads with small stack sizes of 128KB. If your walk app crashes, it may be due

diff --git a/manifest.go b/manifest.go
@@ -0,0 +1,49 @@
+package walk
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"syscall"
+
+	"github.com/lxn/win"
+)
+
+/*
+This function creates a manifest file for this application and activates it
+before creating the GUI controls. This way, the common controls version 6 is
+used automatically and the users of this library does not need to mess with
+manifest files themselves.
+*/
+func init() {
+	appName := filepath.Base(os.Args[0])
+	appName = strings.TrimSuffix(appName, filepath.Ext(appName))
+	manifest := `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
+    <assemblyIdentity version="1.0.0.0" processorArchitecture="*" name="` + appName + `" type="win32"/>
+    <dependency>
+        <dependentAssembly>
+            <assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"/>
+        </dependentAssembly>
+    </dependency>
+    <asmv3:application>
+        <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
+            <dpiAware>true</dpiAware>
+        </asmv3:windowsSettings>
+    </asmv3:application>
+</assembly>`
+	// create a temporary manifest file, load it, then delete it
+	f, err := ioutil.TempFile("", "manifest_")
+	if err != nil {
+		return
+	}
+	manifestPath := f.Name()
+	defer os.Remove(manifestPath)
+	f.WriteString(manifest)
+	f.Close()
+	ctx := win.CreateActCtx(&win.ACTCTX{
+		Source: syscall.StringToUTF16Ptr(manifestPath),
+	})
+	win.ActivateActCtx(ctx)
+}