error LNK2019: 無法解析的外部符號 __vsnprintf 問題的解決方法
編譯如下程式碼時候報錯 ，說
dxerr.lib(dxerra.obj) : error LNK2019: 無法解析的外部符號 __vsnprintf，函式 "long __stdcall StringVPrintfWorkerA(char *,unsigned int,unsigned int *,char const *,char *)" (?StringVPrintfWorkerA@@YGJPADIPAIPBD0@Z) 中引用了該符號
按照帖子《關於連結器附加依賴項裡面新增legacy_stdio_definitions.lib解決標準庫檔案不全的問題》https://blog.csdn.net/gongxun1994/article/details/81813874 中的方法二則可以編譯成功
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今天將vs2013的c++檔案用vs2017重新載入，發現如下問題
錯誤 LNK2019 無法解析的外部符號 __imp__vsnprintf，該符號在函式 __glfwInputError 中被引用
錯誤 LNK2019 無法解析的外部符號 __imp__sscanf，該符號在函式 __glfwRefreshContextAttribs 中被引用
方法一：在vs2017解決方案中的找到某一工程->屬性，在連結器->附加依賴項裡面新增legacy_stdio_definitions.lib即可
方法二：在啟動檔案開頭寫上#pragma comment(lib, “legacy_stdio_definitions.lib”)即可
出現這個問題的原因是vs2017預設編譯時將許多標準庫採用內聯方式處理，因而沒有可以連結的標準庫檔案，所以要專門新增標準庫檔案來連結標準庫中的函式
附連結：
https://stackoverflow.com/questions/29556290/random-unresolved-external-symbols-that-shouldnt-be-there
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版權宣告：本文為CSDN博主「Sean_gGo」的原創文章，遵循CC 4.0 BY-SA版權協議，轉載請附上原文出處連結及本宣告。
原文連結：https://blog.csdn.net/gongxun1994/article/details/81813874
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只需加一句#pragma comment(lib,"legacy_stdio_definitions.lib") 即可解決問題
修改後的程式碼【chapter11\Play Sound Demo】
// Beginning Game Programming
// MyGame.cpp
#pragma comment(lib,"legacy_stdio_definitions.lib") // 只需新增這一句
//關於連結器附加依賴項裡面新增legacy_stdio_definitions.lib解決標準庫檔案不全的問題
//https://blog.csdn.net/gongxun1994/article/details/81813874
#include "MyDirectX.h"
using namespace std;
const string APPTITLE = "Play Sound Program";
const int SCREENW = 1024;
const int SCREENH = 768;
LPDIRECT3DTEXTURE9 ball_image = NULL;
LPDIRECT3DTEXTURE9 bumper_image = NULL;
LPDIRECT3DTEXTURE9 background = NULL;
//balls
const int NUMBALLS = 10;
SPRITE balls[NUMBALLS];
//bumpers
SPRITE bumpers[4];
//timing variable
DWORD screentimer = timeGetTime();
DWORD coretimer = timeGetTime();
DWORD bumpertimer = timeGetTime();
//the wave sound
CSound *sound_bounce = NULL;
CSound *sound_electric = NULL;
bool Game_Init(HWND window)
{
srand(time(NULL));
//initialize Direct3D
if (!Direct3D_Init(window, SCREENW, SCREENH, false))
{
MessageBox(window,"Error initializing Direct3D",APPTITLE.c_str(),0);
return false;
}
//initialize DirectInput
if (!DirectInput_Init(window))
{
MessageBox(window,"Error initializing DirectInput",APPTITLE.c_str(),0);
return false;
}
//initialize DirectSound
if (!DirectSound_Init(window))
{
MessageBox(window,"Error initializing DirectSound",APPTITLE.c_str(),0);
return false;
}
//load the background image
background = LoadTexture("craters.tga");
if (!background)
{
MessageBox(window,"Error loading craters.tga",APPTITLE.c_str(),0);
return false;
}
//load the ball image
ball_image = LoadTexture("lightningball.tga");
if (!ball_image)
{
MessageBox(window,"Error loading lightningball.tga",APPTITLE.c_str(),0);
return false;
}
//load the bumper image
bumper_image = LoadTexture("bumper.tga");
if (!ball_image)
{
MessageBox(window,"Error loading bumper.tga",APPTITLE.c_str(),0);
return false;
}
//set the balls' properties
for (int n=0; n<NUMBALLS; n++)
{
balls[n].x = (float)(rand() % (SCREENW-200));
balls[n].y = (float)(rand() % (SCREENH-200));
balls[n].width = 64;
balls[n].height = 64;
balls[n].velx = (float)(rand() % 6 - 3);
balls[n].vely = (float)(rand() % 6 - 3);
}
//set the bumpers' properties
for (int n=0; n<4; n++)
{
bumpers[n].width = 128;
bumpers[n].height = 128;
bumpers[n].columns = 2;
bumpers[n].frame = 0;
}
bumpers[0].x = 150;
bumpers[0].y = 150;
bumpers[1].x = SCREENW-150-128;
bumpers[1].y = 150;
bumpers[2].x = 150;
bumpers[2].y = SCREENH-150-128;
bumpers[3].x = SCREENW-150-128;
bumpers[3].y = SCREENH-150-128;
//load bounce wave file
sound_bounce = LoadSound("step.wav");
if (!sound_bounce)
{
MessageBox(window,"Error loading step.wav",APPTITLE.c_str(),0);
return false;
}
return true;
}
void rebound(SPRITE &sprite1, SPRITE &sprite2)
{
float centerx1 = sprite1.x + sprite1.width/2;
float centery1 = sprite1.y + sprite1.height/2;
float centerx2 = sprite2.x + sprite2.width/2;
float centery2 = sprite2.y + sprite2.height/2;
if (centerx1 < centerx2)
{
sprite1.velx = fabs(sprite1.velx) * -1;
}
else if (centerx1 > centerx2)
{
sprite1.velx = fabs(sprite1.velx);
}
if (centery1 < centery2)
{
sprite1.vely = fabs(sprite1.vely) * -1;
}
else {
sprite1.vely = fabs(sprite1.vely);
}
sprite1.x += sprite1.velx;
sprite1.y += sprite1.vely;
}
void Game_Run(HWND window)
{
int n;
if (!d3ddev) return;
DirectInput_Update();
d3ddev->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(0,0,100), 1.0f, 0);
/*
* slow ball movement
*/
if (timeGetTime() > coretimer + 10)
{
//reset timing
coretimer = GetTickCount();
int width = balls[0].width;
int height = balls[0].height;
//move the ball sprites
for (n=0; n<NUMBALLS; n++)
{
balls[n].x += balls[n].velx;
balls[n].y += balls[n].vely;
//warp the ball at screen edges
if (balls[n].x > SCREENW)
{
balls[n].x = -width;
}
else if (balls[n].x < -width)
{
balls[n].x = SCREENW+width;
}
if (balls[n].y > SCREENH+height)
{
balls[n].y = -height;
}
else if (balls[n].y < -height)
{
balls[n].y = SCREENH+height;
}
}
}
//reset bumper frames
if (timeGetTime() > bumpertimer + 250)
{
bumpertimer = timeGetTime();
for (int bumper=0; bumper<4; bumper++)
{
bumpers[bumper].frame = 0;
}
}
/*
* check for ball collisions with bumpers
*/
for (int ball=0; ball<NUMBALLS; ball++)
{
for (int bumper=0; bumper<4; bumper++)
{
if (CollisionD(balls[ball], bumpers[bumper]))
{
rebound(balls[ball], bumpers[bumper]);
bumpers[bumper].frame = 1;
PlaySound(sound_bounce);
}
}
}
/*
* check for sprite collisions with each other
* (as fast as possible--with no time limiter)
*/
for (int one=0; one<NUMBALLS; one++)
{
for (int two=0; two<NUMBALLS; two++)
{
if (one != two)
{
if (CollisionD(balls[one], balls[two]))
{
while (CollisionD(balls[one], balls[two]))
{
//rebound ball one
rebound(balls[one], balls[two]);
//rebound ball two
rebound(balls[two], balls[one]);
}
}
}
}
}
/*
* slow rendering to approximately 60 fps
*/
if (timeGetTime() > screentimer + 14)
{
screentimer = GetTickCount();
//start rendering
if (d3ddev->BeginScene())
{
//start sprite handler
spriteobj->Begin(D3DXSPRITE_ALPHABLEND);
//draw background
Sprite_Transform_Draw(background, 0, 0, SCREENW, SCREENH);
//draw the balls
for (n=0; n<NUMBALLS; n++)
{
Sprite_Transform_Draw(ball_image,
balls[n].x, balls[n].y,
balls[n].width, balls[n].height);
}
//draw the bumpers
for (n=0; n<4; n++)
{
Sprite_Transform_Draw(bumper_image,
bumpers[n].x,
bumpers[n].y,
bumpers[n].width,
bumpers[n].height,
bumpers[n].frame,
bumpers[n].columns);
}
//stop drawing
spriteobj->End();
//stop rendering
d3ddev->EndScene();
d3ddev->Present(NULL, NULL, NULL, NULL);
}
}
//exit with escape key or controller Back button
if (KEY_DOWN(VK_ESCAPE)) gameover = true;
if (controllers[0].wButtons & XINPUT_GAMEPAD_BACK) gameover = true;
}
void Game_End()
{
if (ball_image) ball_image->Release();
if (bumper_image) bumper_image->Release();
if (background) background->Release();
if (sound_bounce) delete sound_bounce;
DirectSound_Shutdown();
DirectInput_Shutdown();
Direct3D_Shutdown();
}