golang win32编程的一个dll坑

例子

package main

import (
	"github.com/lxn/win"
	"strconv"
	"syscall"
)

func _TEXT(_str string) *uint16 {
	return syscall.StringToUTF16Ptr(_str)
}
func _toString(_n int32) string {
	return strconv.Itoa(int(_n))
}
func main() {
	var hwnd win.HWND
	cxScreen := win.GetSystemMetrics(win.SM_CXSCREEN)
	cyScreen := win.GetSystemMetrics(win.SM_CYSCREEN)
	win.MessageBox(hwnd, _TEXT("屏幕长-:"+_toString(cxScreen)+"宽:"+_toString(cyScreen)), _TEXT(" 消息"), win.MB_OK)
}

唯一的就是有一个win这个go module里有一个坑，在phd.go 中

func init() {
// Library
libpdhDll = syscall.MustLoadDLL("pdh.dll")


// Functions
pdh_AddCounterW = libpdhDll.MustFindProc("PdhAddCounterW")
pdh_AddEnglishCounterW = libpdhDll.MustFindProc("PdhAddEnglishCounterW") // XXX: only supported on versions > Vista.
pdh_CloseQuery = libpdhDll.MustFindProc("PdhCloseQuery")
pdh_CollectQueryData = libpdhDll.MustFindProc("PdhCollectQueryData")
pdh_GetFormattedCounterValue = libpdhDll.MustFindProc("PdhGetFormattedCounterValue")
pdh_GetFormattedCounterArrayW = libpdhDll.MustFindProc("PdhGetFormattedCounterArrayW")
pdh_OpenQuery = libpdhDll.MustFindProc("PdhOpenQuery")
pdh_ValidatePathW = libpdhDll.MustFindProc("PdhValidatePathW")
}

PdhAddEnglishCounterW这个api只在vista以上版本支持，所以如果在xp下运行，在载入时会因找不到该函数的地址崩溃，临时解决方案，暴力注释掉

//pdh_AddEnglishCounterW = libpdhDll.MustFindProc("PdhAddEnglishCounterW") // XXX: only supported on versions > Vista.

更丰富的例子：https://github.com/lxn/walk

初步感觉用go写win gui，是个没意思的事情！

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