从资产中读取文本文件时的奇怪行为

Question

我正在玩本机活动和GLES 2.0,我正在使用ndk从资产中加载GLES着色器.

这是简单着色器的来源:

顶点着色器:simple.vsh

attribute vec4 vPosition;
void main()
{
    gl_Position = vPosition;
}

片段着色器:simple.fsh

precision mediump float;
void main()
{
    gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}

这是我用来加载着色器文件的代码

AAsset *shaderAsset= AAssetManager_open(app->activity->assetManager, path, AASSET_MODE_BUFFER);
size_t length = AAsset_getLength(shaderAsset);

LOGI("Shader source size: %d\n", length);


char* buffer = (char*) malloc(length);

AAsset_read(shaderAsset, buffer, length);   

LOGI("Shader source : %s\n", buffer);

AAsset_close(shaderAsset);
free(buffer);

当我运行应用程序时,我在android logcat中看到了这个:

 Shader source size: 71
 07-22 13:23:52.683 11135 11146 I native-activity: Shader source : attribute vec4 vPosition;
 07-22 13:23:52.683 11135 11146 I native-activity: void main()
 07-22 13:23:52.683 11135 11146 I native-activity: {
 07-22 13:23:52.683 11135 11146 I native-activity:     gl_Position = vPosition;
 07-22 13:23:52.683 11135 11146 I native-activity: }
 07-22 13:23:52.683 11135 11146 I native-activity: sP
 07-22 13:23:52.683 11135 11146 I native-activity: Shader source size: 86
 07-22 13:23:52.683 11135 11146 I native-activity: Shader source : precision mediump float;
 07-22 13:23:52.683 11135 11146 I native-activity: void main()
 07-22 13:23:52.683 11135 11146 I native-activity: {
 07-22 13:23:52.683 11135 11146 I native-activity:     gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
 07-22 13:23:52.683 11135 11146 I native-activity: }
 07-22 13:23:52.683 11135 11146 I native-activity: fs`

注意文件末尾的"sP"和"fs".

我还为我的构建xml文件中的文件扩展添加了"nocompression",以防万一是问题所在,但问题仍然存在.

有谁知道可能导致这种情况的原因是什么？

Answer 1

不知何故,零尾零点不会进入资产.

尝试使用

// one extra char for the trailing zero
char* buffer = (char*) malloc(length + 1);

AAsset_read(shaderAsset, buffer, length);   

// fix the string to be zero-terminated
buffer[length] = 0;