Simplify Windows building

binding.gyp

@@ -24,12 +24,12 @@
       ],
 
       "libraries": [
-        "<!@(pkg-config --libs opencv)"
+        "<!@(node utils/find-opencv.js --libs)"
       ],
       # For windows
 
       "include_dirs": [
-        "<!@(pkg-config --cflags opencv)",
+        "<!@(node utils/find-opencv.js --cflags)",
         "<!(node -e \"require('nan')\")"
       ],
 
@@ -45,9 +45,11 @@
         }],
         [ "OS==\"win\"", {
             "cflags": [
-              "<!@(pkg-config --cflags \"opencv >= 2.4.9\" )",
               "-Wall"
             ],
+            "defines": [
+                "WIN"
+            ],
             "msvs_settings": {
               "VCCLCompilerTool": {
                 "ExceptionHandling": "2",

src/OpenCV.h

@@ -1,6 +1,16 @@
 #ifndef __NODE_OPENCV_H__
 #define __NODE_OPENCV_H__
 
+#ifdef WIN
+    /*
+        This is needed on Windows for Visual Studio to not throw an error in the
+        build/include/opencv2/flann/any.h file in OpenCV.
+    */
+    namespace std{ typedef type_info type_info; }
+#endif
+
+
+
 #include <v8.h>
 #include <node.h>
 #include <node_object_wrap.h>

utils/find-opencv.js

@@ -0,0 +1,115 @@
+var exec = require("child_process").exec;
+var fs = require("fs");
+var flag = process.argv[2];
+
+function main(){
+
+    //Try using pkg-config, but if it fails and it is on Windows, try the fallback
+    exec("pkg-config opencv " + flag, function(error, stdout, stderr){
+        if(error){
+            if(process.platform === "win32"){
+                fallback();
+            }
+        }
+        else{
+            console.log(stdout);
+        }
+    });
+}
+
+//======================Windows Specific=======================================
+
+function fallback(){
+    exec("echo %OPENCV_DIR%", function(error, stdout, stderr){
+        stdout = cleanupEchoOutput(stdout);
+        if(error){
+            console.log("ERROR: There was an error reading OPENCV_DIR");
+        }
+        else if(stdout === "%OPENCV_DIR%") {
+            console.log("ERROR: OPENCV_DIR doesn't seem to be defined");
+        }
+        else {
+            getVisualStudioVersion(function(version){
+                getProcessArch(function(bits){
+                    printPaths(stdout, version, bits);
+                });
+            });
+        }
+    });
+}
+
+function printPaths(opencvPath, version, bits){
+    if(flag === "--cflags") {
+        console.log("\"" + opencvPath + "include\"");
+        console.log("\"" + opencvPath + "include\\opencv\"");
+    }
+    else if(flag === "--libs") {
+        var libPath = opencvPath + bits + "\\vc" + version + "\\lib\\";
+
+        fs.readdir(libPath, function(err, files){
+            if(err){
+                console.log("ERROR: couldn't read the lib directory");
+                console.log(err);
+            }
+
+            var libs = "";
+            for(var i = 0; i < files.length; i++){
+                if(getExtension(files[i]) === "lib"){
+                    libs = libs + " \"" + libPath + files[i] + "\" \r\n ";
+                }
+            }
+            console.log(libs);
+        });
+    }
+    else {
+        console.log("Error: unknown argument '" + flag + "'");
+    }
+}
+
+//This gets the architecture of the NodeJS that is running this script,
+//either x86 or x64
+function getProcessArch(cb){
+    exec("echo %PROCESSOR_ARCHITECTURE%", function(error, stdout, stderr) {
+        if(!error) {
+            var arch = cleanupEchoOutput(stdout);
+            if(arch === "AMD64"){
+                cb("x64");
+            }
+            else if(arch === "x86"){
+                cb("x86");
+            }
+            else {
+                console.log("ERROR: Unrecognized architecture");
+            }
+        }
+        else {
+            console.log("ERROR: There was an error getting the architecture");
+        }
+    });
+}
+
+function getVisualStudioVersion(cb, version){
+    if(typeof(version) === "undefined") version = 11;
+    exec("reg query HKEY_CLASSES_ROOT\\VisualStudio.DTE." + version + ".0",
+        function(error, stdout, stderr){
+            if(!error){
+                cb(version);
+            }
+            else if(version < 13) {
+                //Try the next version
+                getVisualStudioVersion(cb, version + 1);
+            }
+            else {
+                console.log("ERROR: Can't find Visual Studio");
+            }
+        });
+}
+
+function cleanupEchoOutput(s){
+    return s.slice(0, s.length - 2);
+}
+
+function getExtension(s){
+    return s.substr(s.lastIndexOf(".") + 1);
+}
+main();