在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
tW"ptU^9)
wU)5Evp[ 一、实现方法
y{Y+2}Dv/ [Pwo,L,) 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
dIa(</ } m4U+,|Fa #pragma data_seg("shareddata")
WfT)CIKs HHOOK hHook =NULL; //钩子句柄
iSz@E&[X UINT nHookCount =0; //挂接的程序数目
m2q;^o:J static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
o / g+Z static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
D4O5@KfL static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
%iL@:'?K static int KeyCount =0;
*8X9lv.Z static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
\.;ct #pragma data_seg()
=>}.W:= dwbY"t[9 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
*RbOQ86vP (&S[R{=^j DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
4Re@ QOZ q\'P1~ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
JRjMt-7H_ cKey,UCHAR cMask)
C:GHP$/} {
wQ=yY$VP BOOL bAdded=FALSE;
]RXtC* for(int index=0;index<MAX_KEY;index++){
,C,e/>+My if(hCallWnd[index]==0){
2C33;?M hCallWnd[index]=hWnd;
M|5]#2J_2 HotKey[index]=cKey;
JlDDM
% HotKeyMask[index]=cMask;
>+jbMAYSq bAdded=TRUE;
acYoOW1G KeyCount++;
+V);'"L break;
U]! .~ji3
}
xe gL! }
:7Z\3_D/ return bAdded;
opcR~tg@r }
DPS1GO* //删除热键
J={OOj BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
iPY vePQ {
<m/b]| BOOL bRemoved=FALSE;
yg-FJ/
for(int index=0;index<MAX_KEY;index++){
MpIw^a3(r if(hCallWnd[index]==hWnd){
HEB/\ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
mB^I@oZ* hCallWnd[index]=NULL;
AJ?}Hel[0 HotKey[index]=0;
E/8u' HotKeyMask[index]=0;
/x:(SR2, bRemoved=TRUE;
e8ULf~I KeyCount--;
L>~@9a\jO break;
4&oXy,8LC }
,+\4
'` }
*0&4mi8 }
by|?g8 return bRemoved;
9 yW~79n }
p17|ld` eC^0I78x v(Bp1~PPZM DLL中的钩子函数如下:
6}i&6@Snq? wCU&Xb$F LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
),;D;LI{S {
TvWU[=4Yk BOOL bProcessed=FALSE;
+\k9w.[:/ if(HC_ACTION==nCode)
UR/qVO? {
0/SC if((lParam&0xc0000000)==0xc0000000){// 有键松开
L*
khj 3; switch(wParam)
qJX+[PJ {
B3cf] S% case VK_MENU:
R?bn,T> MaskBits&=~ALTBIT;
GcZM+ c break;
iz9\D*or case VK_CONTROL:
}c35FM, MaskBits&=~CTRLBIT;
_z<Y#mik break;
cVB|sYdf case VK_SHIFT:
k_K,J6_) MaskBits&=~SHIFTBIT;
e+F}9HR7 break;
j(Fa=pi default: //judge the key and send message
/zl3&~4 break;
9Q C"Od9H }
Y/^[qD for(int index=0;index<MAX_KEY;index++){
|.Nr.4Yp if(hCallWnd[index]==NULL)
RP~vB#} continue;
oN[Fz a> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
tKG;k"wk {
"GwWu-GS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
b(|%Gbg@c bProcessed=TRUE;
7wiK.99 }
=`]|/<=9'U }
RRS~ xOg }
Mt[Bq6}ZD else if((lParam&0xc000ffff)==1){ //有键按下
P1 7> 6)a switch(wParam)
;Na8_} {
k1f3?l
vlU case VK_MENU:
ERfd7V<c> MaskBits|=ALTBIT;
-SQJH}zCT+ break;
/FP ~jV!z case VK_CONTROL:
d7W%zg\T MaskBits|=CTRLBIT;
FX|0R#4vm break;
J0?$v6S case VK_SHIFT:
/'Quu)~ MaskBits|=SHIFTBIT;
*=$[}!YG break;
/'&.aGW4% default: //judge the key and send message
*Nvy+V break;
k_*XJ <S!Y }
CF3E]dt for(int index=0;index<MAX_KEY;index++){
~@[(N]=q if(hCallWnd[index]==NULL)
lFiq<3Nk continue;
->&BcPLn if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
LKR= =;qn {
"xD}6(NL(r SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
DL'd&;6 bProcessed=TRUE;
|`_ <@b }
i(M(OR/4 }
9,S,NvSq }
BGB,Gb if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
xHEVR!&c4 for(int index=0;index<MAX_KEY;index++){
Q7CwQi if(hCallWnd[index]==NULL)
6-*~t8 continue;
eZ@Gu
if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
9nng}em>. SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
?vZWUWa //lParam的意义可看MSDN中WM_KEYDOWN部分
vQ:x%=] }
'v'`
F*6 }
xNC* ]8d }
}': EJ~H return CallNextHookEx( hHook, nCode, wParam, lParam );
/{fZH,!L }
F3r S6_ W$z#ssr 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
<KHv|)ak Q?*
nuE BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
H{j~ihq7 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
wD<vg3e[H 5*JV )[ 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
{[Uti^)m% %:"
RzHN LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
-/M9 vS {
9Tzc(yCY if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
a<f;\$h] {
zo_k\K`{@ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
5c<b| SaveBmp();
MS{Hz,I, return FALSE;
,]f) ,;= }
?@_v,,| …… //其它处理及默认处理
rumAo'T/% }
>:.w7LQy/ rU;
g0'4e *mf}bTiS 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
k!Vn4?B"k &[NVP&9&U 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
pt=7~+r AiY|O S3R 二、编程步骤
~J%R-{U9 L&:M8xiA~$ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
|2qR^Hd&5 @ L\-ZWq 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
5XzrS-I+X@ 'GrRuT< 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
?$<SCN= d-hbvLn 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
XXXljh6 j'k8^*M6 5、 添加代码,编译运行程序。
<Cu'!h_nL ;JAK[o8i 三、程序代码
i B%XBR dj3|f{kg{ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
&K06}[J #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
+*n]tlk #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
USE [N #if _MSC_VER > 1000
ah 4kA LO #pragma once
*]FgfttES #endif // _MSC_VER > 1000
'n>K^rA #ifndef __AFXWIN_H__
$X`bm* #error include 'stdafx.h' before including this file for PCH
Mg#`t$u #endif
U%Dit #include "resource.h" // main symbols
{*sGhGwr class CHookApp : public CWinApp
IZ+*`E {
d
"2wO[ public:
lrCm9Oy CHookApp();
(gLea // Overrides
XxhsPFv // ClassWizard generated virtual function overrides
YQN.Ohtv*F //{{AFX_VIRTUAL(CHookApp)
*f{7 public:
g+igxC}2z virtual BOOL InitInstance();
ot^q}fRX virtual int ExitInstance();
OSU{8. //}}AFX_VIRTUAL
V:(y*tFA //{{AFX_MSG(CHookApp)
OO-_?8I} // NOTE - the ClassWizard will add and remove member functions here.
&xgZFSq // DO NOT EDIT what you see in these blocks of generated code !
F@g17 aa //}}AFX_MSG
[C~fBf5 DECLARE_MESSAGE_MAP()
hl`u"?rg };
Xc{ZN1 4n LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
O97VdNT8 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
bk.*k~_ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
w_\nB}_ BOOL InitHotkey();
YmOldR9v( BOOL UnInit();
E\ tL #endif
Z?-;.G* wqcDAO( //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
6Ux[,]GK #include "stdafx.h"
'[%jjUU #include "hook.h"
$Ru&>D#stK #include <windowsx.h>
B\f"Iirw #ifdef _DEBUG
g-XKP #define new DEBUG_NEW
1^S'sWwe #undef THIS_FILE
l@xWQj9 static char THIS_FILE[] = __FILE__;
=`JW1dM #endif
'gYg~= #define MAX_KEY 100
z23#G>I& #define CTRLBIT 0x04
OH>r[,z0 #define ALTBIT 0x02
l/[pEUYU #define SHIFTBIT 0x01
nkTYWw #pragma data_seg("shareddata")
)u<eO FI+ HHOOK hHook =NULL;
C B6A}m UINT nHookCount =0;
nMkOUW:T! static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
{yTpRQN~ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
~)_K"h.DY static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
2.ew^D# static int KeyCount =0;
:Pc(DfkS static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
3+e4e #pragma data_seg()
5PDSA* HINSTANCE hins;
sp^Wo7&g void VerifyWindow();
-ovoRI^6`} BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
|4Qx=x> //{{AFX_MSG_MAP(CHookApp)
p:Oz<P // NOTE - the ClassWizard will add and remove mapping macros here.
><cU7 ja[^ // DO NOT EDIT what you see in these blocks of generated code!
hzv3F9.x //}}AFX_MSG_MAP
N0nj` END_MESSAGE_MAP()
0JK2%% +N7"EROc CHookApp::CHookApp()
w\Iqzpikr {
vf[&7n // TODO: add construction code here,
![
a // Place all significant initialization in InitInstance
dIvy!d2l }
pp<E))&R o OQ'*7_ CHookApp theApp;
ewpig4 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
vmLpmxS {
fa4=h;>a+ BOOL bProcessed=FALSE;
/p,{?~0mj if(HC_ACTION==nCode)
,%kmXh {
]W;:|/,c if((lParam&0xc0000000)==0xc0000000){// Key up
zz&vfO31J switch(wParam)
p3 e|j {
pcnl0o~ case VK_MENU:
{tc57jsr MaskBits&=~ALTBIT;
=MxpH+spI break;
j|mv+O case VK_CONTROL:
!3@{U@*Z] MaskBits&=~CTRLBIT;
f}2;N break;
Je 31". case VK_SHIFT:
IytDvz*| MaskBits&=~SHIFTBIT;
$T?]+2,6; break;
,m:L2 -J@ default: //judge the key and send message
Ch t%uzb, break;
C s#w72N }
JYQ.EAsr! for(int index=0;index<MAX_KEY;index++){
)nOE8y/ if(hCallWnd[index]==NULL)
\ADLMj`F| continue;
<<sE`>) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
O>%$q8x@i {
m<3w^mww SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
x)_r@l`$ix bProcessed=TRUE;
NJm-%K }
2QL?]Vo }
\sITwPA[z }
' Rc#^U*n else if((lParam&0xc000ffff)==1){ //Key down
Z%OW5]q switch(wParam)
e}e6r3faz {
{yS;NU`2 case VK_MENU:
WFem#hq MaskBits|=ALTBIT;
7E\g
&R. break;
O@wK[(w^ case VK_CONTROL:
uFo/s&6K MaskBits|=CTRLBIT;
n[P\*S break;
+(&|u q^ case VK_SHIFT:
WL1\y| MaskBits|=SHIFTBIT;
5{X*a break;
IJ_ m default: //judge the key and send message
A?r^V2+j break;
X$^JAZ09 }
6OtVaT=}<O for(int index=0;index<MAX_KEY;index++)
:BD>yOlG {
/tZ0
|B( if(hCallWnd[index]==NULL)
5z Kqb continue;
]Jn2Ra"j if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
JD*8@N {
03_pwB)^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
mf9hFy*<4 bProcessed=TRUE;
Mg\TH./Y: }
0 sh~I }
)NIv "Q }
iD714+N( if(!bProcessed){
#ouE r-= for(int index=0;index<MAX_KEY;index++){
B`1kG Ex . if(hCallWnd[index]==NULL)
P0 b4Hq3 continue;
({ k7#1
h8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
jkt6/H SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
(A4&k{C_ }
i/*,N&^ }
)i-gs4[(QN }
Mq'IkSt' return CallNextHookEx( hHook, nCode, wParam, lParam );
G "brT 5: }
>f@ G>H)+ y\,f6=%k BOOL InitHotkey()
" #v%36U {
oM-[B h]A if(hHook!=NULL){
Sc_5FX\Yx nHookCount++;
D5L{T+}Oi% return TRUE;
i*CnoQH }
5\'AD^{ else
d.AC%&W hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
esI'"hVJ if(hHook!=NULL)
Ww`&i nHookCount++;
<u0,Fp return (hHook!=NULL);
eGvOA\y: }
cz(G]{N BOOL UnInit()
6 64q~_@B1 {
7n&yv9" if(nHookCount>1){
p+ Lv=e)0u nHookCount--;
&d,Wy"WPi return TRUE;
U\bC0q }
JDlBVZ! BOOL unhooked = UnhookWindowsHookEx(hHook);
) rpq+~b if(unhooked==TRUE){
3{RL \gh$" nHookCount=0;
;s_"{f`Y6 hHook=NULL;
!8/gL }
6$RpV'xz return unhooked;
!y[3]8Xxv }
u"Y]P*[k Nfaf;;J} BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[K:29N9~4 {
'RLOV BOOL bAdded=FALSE;
CXAVGO'xw for(int index=0;index<MAX_KEY;index++){
|}Ph"g2D, if(hCallWnd[index]==0){
5g0_WpO hCallWnd[index]=hWnd;
onnugj3 HotKey[index]=cKey;
7 :U8 f: HotKeyMask[index]=cMask;
t$I|E bAdded=TRUE;
l"\uf(0K KeyCount++;
Yqj+hC6>, break;
B9#;- QO }
~kb{K; }
PeNF+5s/K return bAdded;
>];"N{ A }
S>t>6&A OZOb1D BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[r9d<Zi}{ {
nzuF]vo BOOL bRemoved=FALSE;
xS+rHC for(int index=0;index<MAX_KEY;index++){
~Z/7pP+ if(hCallWnd[index]==hWnd){
"%
Y u
wMY if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
u"Fjw F? hCallWnd[index]=NULL;
"b%FmM HotKey[index]=0;
0( //D;j HotKeyMask[index]=0;
WeVi]n bRemoved=TRUE;
:Ss3ck*= KeyCount--;
n)RM+g break;
3U;1D2"AE }
BIfi:7I;Q }
CDCC1B G" }
GY-M.|% return bRemoved;
RxG^ }
,8##OB( BX3lPv void VerifyWindow()
!^v\^Fc {
WQKj]:qk0 for(int i=0;i<MAX_KEY;i++){
OKPJuV`y6 if(hCallWnd
!=NULL){ _tWE8r,
if(!IsWindow(hCallWnd)){ GV6mzD@<
hCallWnd=NULL; E474l
HotKey=0; ( 3;`bvYH"
HotKeyMask=0; P']Y(
!L
KeyCount--; *rf$>8~$n
} :-Wv>V\t
} 8&.-]{Z
} JXm?2/
} XeU<^ [
8R4qU!M
BOOL CHookApp::InitInstance() )`Ed_F}k
{ p+<}YDMb
AFX_MANAGE_STATE(AfxGetStaticModuleState()); K\^&+7&zVg
hins=AfxGetInstanceHandle(); 9,WG!4:+W
InitHotkey(); .$wLLE^*
return CWinApp::InitInstance(); aU(tu2
} H.~bD[gA
3_zSp.E\l
int CHookApp::ExitInstance() D9o*8h2$
{ :Tb7r6
VerifyWindow(); _6rKC*Pe1
UnInit(); 98UlNP
return CWinApp::ExitInstance(); h=[-Er'B
} xa#gWIP*
QJSr:dP4dG
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file (\vXA4Oa,
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) . r`[
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c<tmj{$
#if _MSC_VER > 1000 :e2X/tl#
#pragma once 968^ "T#
#endif // _MSC_VER > 1000 r/Dd&x
X9~p4ys9{
class CCaptureDlg : public CDialog
8 u:2,l
{ 61:9(*4~!F
// Construction 40.AM1Z0f
public: hdg<bZk:
BOOL bTray; v[L[A3`"/
BOOL bRegistered; P)1EA;
BOOL RegisterHotkey(); ?Ib}
UCHAR cKey; b:Dg}
UCHAR cMask; \h#9oPy
void DeleteIcon(); sHs g_6~
void AddIcon(); %wW'!p-<
UINT nCount; >'Hx1;
void SaveBmp(); -u~eZ?(!Ye
CCaptureDlg(CWnd* pParent = NULL); // standard constructor _FsB6
G]mc
// Dialog Data =4> @8=JA
//{{AFX_DATA(CCaptureDlg) }Vl^EAR
enum { IDD = IDD_CAPTURE_DIALOG }; Ja [#[BJ?
CComboBox m_Key; X6kaL3L}
BOOL m_bControl; |Puj7Ru
BOOL m_bAlt; 0jTMZ<&zZ
BOOL m_bShift; =|V"#3$f
CString m_Path; e &Rb
CString m_Number; vgAFuQi(
//}}AFX_DATA 4J}3,+
// ClassWizard generated virtual function overrides L[. <o{
//{{AFX_VIRTUAL(CCaptureDlg) wY`#$)O0*
public: ZIW7_Y>_
virtual BOOL PreTranslateMessage(MSG* pMsg); K~@`o-Z[
protected: "dq>)JF\
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [q"NU&SX
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); AT ymKJ
//}}AFX_VIRTUAL iNLDl~uU
// Implementation pVz*ZQ[]
protected: PWG;&ma
HICON m_hIcon; {(0Id !
// Generated message map functions H:MUNc8i
//{{AFX_MSG(CCaptureDlg) yHOqzq56
virtual BOOL OnInitDialog(); -TZ^ ~s
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "XB4yExy
afx_msg void OnPaint(); w%2ziwgh
afx_msg HCURSOR OnQueryDragIcon(); d?}hCo=/Xq
virtual void OnCancel(); #ovM(Mld
afx_msg void OnAbout(); xVTo4-[p
afx_msg void OnBrowse(); 2Fq=jOA)z$
afx_msg void OnChange(); 8]]@S"ZM,\
//}}AFX_MSG O!
(85rp/
DECLARE_MESSAGE_MAP() qK-qcPLsl
}; K0 QH?F
#endif +.K*n&
S}mm\<=1
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file CjV7q y
#include "stdafx.h" D!me%;
#include "Capture.h" D 2$^"
#include "CaptureDlg.h" 5p{25N_t
#include <windowsx.h> #G~wE*VR$
#pragma comment(lib,"hook.lib") C*Xik9n
#ifdef _DEBUG vX 1W@s
#define new DEBUG_NEW Ys%'#f
#undef THIS_FILE B!iFmkCy
static char THIS_FILE[] = __FILE__; FE}s#n_Pd
#endif kyu2)L2u
#define IDM_SHELL WM_USER+1 23k)X"5
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]_\AHnJ
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q|Fjm]AF
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; C (U
class CAboutDlg : public CDialog AoU_;B\b%
{ q#m!/wod
public: :mn(0
R~
CAboutDlg(); "u5KbJW
// Dialog Data PY\W
//{{AFX_DATA(CAboutDlg) T+(M8qb
enum { IDD = IDD_ABOUTBOX }; +K&?)?/=
//}}AFX_DATA *?p
^6vO
// ClassWizard generated virtual function overrides $r):d
//{{AFX_VIRTUAL(CAboutDlg) r;'i<t{P
protected: 6"%@L{UQ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z,SY
N?@
//}}AFX_VIRTUAL (H2ylMpQt
// Implementation GI?PGAT
protected: i)[kubM
//{{AFX_MSG(CAboutDlg) YQx?*
gZS
//}}AFX_MSG 1]Lhk?4t
DECLARE_MESSAGE_MAP() BPh".R J
}; HM
90Sb
~;!BDLMC6
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) V07VwVD
{ @ "0uM?_)-
//{{AFX_DATA_INIT(CAboutDlg) #)FDl70S8
//}}AFX_DATA_INIT 73VQ@Jn
} #1B}-PGCm
!. p
void CAboutDlg::DoDataExchange(CDataExchange* pDX) hAlPl<BO#V
{ m|lM.]2_
CDialog::DoDataExchange(pDX); W
w^7^q&
//{{AFX_DATA_MAP(CAboutDlg) aU4R+.M7@
//}}AFX_DATA_MAP , !r@9T
} *|^,DGfQ6
;}UzJe ,S
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 'OG{*TDPu
//{{AFX_MSG_MAP(CAboutDlg) JBvk)ogM
// No message handlers >T`zh^+5W
//}}AFX_MSG_MAP ygMd$0:MN
END_MESSAGE_MAP() =pyVn_dg
CX]RtV!
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *!i,?vn
: CDialog(CCaptureDlg::IDD, pParent) JV&Zwbu
{ <r_3obRC
//{{AFX_DATA_INIT(CCaptureDlg) 5`{=`
m_bControl = FALSE; r1+c/;TpZ
m_bAlt = FALSE; 9uKOR7.zbo
m_bShift = FALSE; D/e&7^iK
m_Path = _T("c:\\"); 0u>yT?jP
m_Number = _T("0 picture captured."); +)?, {eE|
nCount=0; gji*Wq
bRegistered=FALSE; lx`q *&E
bTray=FALSE; c5<kbe
//}}AFX_DATA_INIT 7&h\l6}Yh
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >B`Cch/'U
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *B%y`cj|
} zf`5>h|
-Sx0qi'%
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 1]Gf)|
{ o
T:j:n
CDialog::DoDataExchange(pDX); 1k$2LQ
//{{AFX_DATA_MAP(CCaptureDlg) eU`;L[
DDX_Control(pDX, IDC_KEY, m_Key); F|6
nwvgq
DDX_Check(pDX, IDC_CONTROL, m_bControl); u
IAZo;
DDX_Check(pDX, IDC_ALT, m_bAlt); -!@H["
DDX_Check(pDX, IDC_SHIFT, m_bShift); jiqi!*
DDX_Text(pDX, IDC_PATH, m_Path); WUzSlZq
DDX_Text(pDX, IDC_NUMBER, m_Number); hK
Fk$A
//}}AFX_DATA_MAP bAN 10U
} E2h(w_l
$|rCrak;
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ={\![{L
//{{AFX_MSG_MAP(CCaptureDlg) DE5d]3B
ON_WM_SYSCOMMAND() z'?SRK5+
ON_WM_PAINT() kea e.6[
ON_WM_QUERYDRAGICON() ?Y%}(3y
ON_BN_CLICKED(ID_ABOUT, OnAbout) w8G7Jy
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) LFl2uV"
ON_BN_CLICKED(ID_CHANGE, OnChange) BQ).`f";d
//}}AFX_MSG_MAP :sU!PF[<
END_MESSAGE_MAP() d:A\<F
+d.u##$
BOOL CCaptureDlg::OnInitDialog() _L8Mpx*E
{ C(f$!~M4b
CDialog::OnInitDialog(); _c[|@D
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 3xRM
1GgO
ASSERT(IDM_ABOUTBOX < 0xF000); n/xXQ7y
CMenu* pSysMenu = GetSystemMenu(FALSE); |!{z?
i
if (pSysMenu != NULL) KrJ 5"1=
{ #c6ui0E%;t
CString strAboutMenu; ~azF+}x90N
strAboutMenu.LoadString(IDS_ABOUTBOX); 43+EX.c
if (!strAboutMenu.IsEmpty()) f#*h^91x
{ f;e_04K
pSysMenu->AppendMenu(MF_SEPARATOR); Ga]47pQ"F
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); d#E(~t(^
} `Q:de~+AM{
} H~~7~1"x
SetIcon(m_hIcon, TRUE); // Set big icon >/(i3)
SetIcon(m_hIcon, FALSE); // Set small icon AqKHjCI
m_Key.SetCurSel(0); -b@v0%Q2M*
RegisterHotkey(); E7V38Z
CMenu* pMenu=GetSystemMenu(FALSE); MomLda
V9Q
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _TtX`b_Z
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); -b].SG5S
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \El|U#$u'
return TRUE; // return TRUE unless you set the focus to a control YI L'YNH
} N<p5p0
AmP#'U5
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) eL<m.06cfY
{ <l*agH-.3
if ((nID & 0xFFF0) == IDM_ABOUTBOX) rd XCWK$E
{ n;e."^5
CAboutDlg dlgAbout; 98X!uh'
dlgAbout.DoModal(); ?lu_}t]
} ,lrYl!,
else Tm(Q@
{ X(4s;i
CDialog::OnSysCommand(nID, lParam); <]Ij(+J;
} FgXu1-
} co
\[{}}
"2*G$\
void CCaptureDlg::OnPaint() qXXYF>Z-
{ ^`l"'6
if (IsIconic()) {
z-5GH|
{ Hlz'a1\:O]
CPaintDC dc(this); // device context for painting pw0Px
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); f 1sy9nQs
// Center icon in client rectangle sjkWz2]S
int cxIcon = GetSystemMetrics(SM_CXICON); C4&U:y<ju
int cyIcon = GetSystemMetrics(SM_CYICON); b7?U8/#'
CRect rect; KC&H*
GetClientRect(&rect); SNQz8(O
int x = (rect.Width() - cxIcon + 1) / 2; mgmWDtxN
int y = (rect.Height() - cyIcon + 1) / 2; Ah6wU|_-g
// Draw the icon s/r5,IFR
dc.DrawIcon(x, y, m_hIcon); ;b, -$A
} ZC3tbhV
else <m?GJuQ'
{ *LY~l
CDialog::OnPaint(); +P>Gy`D9
} uPa/,"p
} `4q5CJ2
43vGgGW
HCURSOR CCaptureDlg::OnQueryDragIcon() \4[c}l
{ )B-MPuB
return (HCURSOR) m_hIcon; v p"%IW
} KC@k9e
Fpy6"Z?z
void CCaptureDlg::OnCancel() -9=M9}eDF
{ L9E;Uii0
if(bTray) l=oN X"l=
DeleteIcon(); + ")qi=
CDialog::OnCancel(); {DKXn`V
} <C7M";54-
5*s1qA0^
void CCaptureDlg::OnAbout() )e4WAlg8c
{ O"_erH\nk
CAboutDlg dlg; jF%)Bhn(
dlg.DoModal(); nz,Mqol
} >i^y;5
&"U9X"8b
void CCaptureDlg::OnBrowse() zWCW: dI
{ b*I&k":
CString str; YQN]x}:E+4
BROWSEINFO bi; l 'AK
char name[MAX_PATH]; @-)<|orU4
ZeroMemory(&bi,sizeof(BROWSEINFO)); \iFMU#
bi.hwndOwner=GetSafeHwnd(); ?aK'OIo
bi.pszDisplayName=name; 9@KUqoX
bi.lpszTitle="Select folder"; #rn4$
bi.ulFlags=BIF_RETURNONLYFSDIRS; (lyt"Ty
LPITEMIDLIST idl=SHBrowseForFolder(&bi); @<@R=aqE
if(idl==NULL) %8}WX@SB
return; =oL8d6nI
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); YtwmlIar`
str.ReleaseBuffer(); \Dvl%:8
m_Path=str; /0B07B
if(str.GetAt(str.GetLength()-1)!='\\') no~O R Q
m_Path+="\\"; `^ieT#(O
UpdateData(FALSE); wx]+*Lzz
} 8ktjDs$=.:
A}>|tm7|
void CCaptureDlg::SaveBmp() nUI63?
{ uR06&SaA>
CDC dc; )@8'k]Glw.
dc.CreateDC("DISPLAY",NULL,NULL,NULL); }<(
"0jC
CBitmap bm; ?D*Hl+iu
int Width=GetSystemMetrics(SM_CXSCREEN); ?$"x^=te7
int Height=GetSystemMetrics(SM_CYSCREEN); T..N*6<X
bm.CreateCompatibleBitmap(&dc,Width,Height); y1,?ZWTayr
CDC tdc; ]y1$F
Ir+
tdc.CreateCompatibleDC(&dc); JfZL?D{NM
CBitmap*pOld=tdc.SelectObject(&bm); C ?GvTc
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); LG/=+[\{E
tdc.SelectObject(pOld); ;,F-6RNj
BITMAP btm; 8]cv &d1f
bm.GetBitmap(&btm); tJ?qcT?
DWORD size=btm.bmWidthBytes*btm.bmHeight; d&PE,$XC
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ImUQ*0
BITMAPINFOHEADER bih; "4Vi=* 2V
bih.biBitCount=btm.bmBitsPixel; /t$+Af,}
bih.biClrImportant=0; htUy2v#V
bih.biClrUsed=0; h/0<:eZ*
bih.biCompression=0; w%i+>\tO
bih.biHeight=btm.bmHeight; I2t-D1X
bih.biPlanes=1; p\\P50(-
bih.biSize=sizeof(BITMAPINFOHEADER); Xm"w,J&
bih.biSizeImage=size; @1pW!AdN
bih.biWidth=btm.bmWidth; .RQ Xxw
bih.biXPelsPerMeter=0; Ct =E;v7}
bih.biYPelsPerMeter=0; _Ep{|]:gw
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ~>}dse
static int filecount=0; \j2:
6]Hm
CString name; c t2_N
name.Format("pict%04d.bmp",filecount++); "v\ bMuS
name=m_Path+name; x[GFX8h(k6
BITMAPFILEHEADER bfh; `@fhge
bfh.bfReserved1=bfh.bfReserved2=0; hQg,#r(JE4
bfh.bfType=((WORD)('M'<< 8)|'B'); C&gOA8nf
bfh.bfSize=54+size; eeI9[lTw
bfh.bfOffBits=54; /I`cS%U
CFile bf; ?YkO+?}+
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ "xvV'&lQ
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); sUyCAKebRr
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 2-"Lxe65f
bf.WriteHuge(lpData,size); 3oppV_^JdT
bf.Close(); /ctaAQDUh\
nCount++; |? ;"B:0
} ohQz%?r
GlobalFreePtr(lpData); YO.`l~ v
if(nCount==1) gqO%^b)6
m_Number.Format("%d picture captured.",nCount); b.mjQ
else TRr4`y%
m_Number.Format("%d pictures captured.",nCount); zn2"swhq\V
UpdateData(FALSE); >0g`U
} J[&
7,}
N8DiEB3~
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {Gk}3u/
{ uNPD~TYN
if(pMsg -> message == WM_KEYDOWN) $+!}Vtb
{ Azq#}Oe)u
if(pMsg -> wParam == VK_ESCAPE) |k7ts&2
return TRUE; Q^1#xBd
if(pMsg -> wParam == VK_RETURN) eu}:Wg2
return TRUE; i
h`y0(<
} Pq{YZMr
return CDialog::PreTranslateMessage(pMsg); 9AVK_
} &geOFe}R
5H'b4Cyi`
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (04j4teE
{ 6S! lD=
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ m5'__<
SaveBmp(); 2kp|zX(
return FALSE; :uT
fhr
} T_(e(5
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =XRgT1>e
CMenu pop; .^9/ 0.g8t
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); XDrlJvrPL
CMenu*pMenu=pop.GetSubMenu(0); )'K!)?&d
pMenu->SetDefaultItem(ID_EXITICON); Y>dg10=
CPoint pt; BZ\EqB
GetCursorPos(&pt); |$.sB|_
N
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ZaNyNxbp>z
if(id==ID_EXITICON) 5Re`D|8
DeleteIcon(); {R1Cxt}
else if(id==ID_EXIT) v:J.d5
OnCancel(); :nbW.B3GV
return FALSE; 654jS!
} \fM!^
LRESULT res= CDialog::WindowProc(message, wParam, lParam); m|#(gX|F
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ]mD=Br*r~
AddIcon(); 8ZNd|\
return res; e$/Zb`k
} WrK^>
2\z`G
void CCaptureDlg::AddIcon() B!E<uVC
{ 0o"<^]
_|
NOTIFYICONDATA data; @WDqP/4
data.cbSize=sizeof(NOTIFYICONDATA); vU\w3
CString tip; AP?{N:+
tip.LoadString(IDS_ICONTIP); w=P<4bdT
data.hIcon=GetIcon(0); {6=H/g=:i
data.hWnd=GetSafeHwnd(); MeK\eZ\
strcpy(data.szTip,tip); y?R <g^A
data.uCallbackMessage=IDM_SHELL; .U(SkZ`6
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -fSKJo#}|
data.uID=98; i/O,`2
Shell_NotifyIcon(NIM_ADD,&data); P`IMvOs&
ShowWindow(SW_HIDE); ++p&
x{
bTray=TRUE; j9L+.UVI,
} C(%5,|6
,rl
<ye*&
void CCaptureDlg::DeleteIcon() rY_C3;B
{ -JyODW#j
NOTIFYICONDATA data; n4r( Vg1GS
data.cbSize=sizeof(NOTIFYICONDATA); <8z[,X}bM
data.hWnd=GetSafeHwnd(); 1Z$99
data.uID=98; =|{,5="
Shell_NotifyIcon(NIM_DELETE,&data); w3?t})PB&
ShowWindow(SW_SHOW); Kz*AzB
SetForegroundWindow(); iqv\ag
ShowWindow(SW_SHOWNORMAL); HU'`kimWb
bTray=FALSE; [%)B%h`XGf
} KbuGf$Bv
d8 BK/b
void CCaptureDlg::OnChange() !,(bXa\^
{ uTlT'9)
RegisterHotkey(); rbJ)RN^.
} Ci#5@Q9#w
M:Y!k<p
BOOL CCaptureDlg::RegisterHotkey() M3Z Jt' |
{ o j4)7{
UpdateData(); Kp=3\) &
UCHAR mask=0; OrH1fhh
UCHAR key=0; PK`(qK9
if(m_bControl) 9q,JqB
mask|=4; X)R]a]1A
if(m_bAlt) gZ=9Y:$
mask|=2; ,"MUfZ
if(m_bShift) :~A1Ud4c
mask|=1; `_{'?II
key=Key_Table[m_Key.GetCurSel()]; #]\G*>{
if(bRegistered){ ?28GQyk4
DeleteHotkey(GetSafeHwnd(),cKey,cMask); AU?YZEAei
bRegistered=FALSE; KZ
>"L
} 2'^OtM,
cMask=mask; u(G;57ms
cKey=key; Ky~~Cd$
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,HO/Q6;N
return bRegistered; EV,NJ3V
} ghO//?m
68br
四、小结 Qc<O; #
.Fz6+m;Z
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。